2021-05-28 09:00:37

#Program.cs

using System;
using System.Collections.Generic;
using Develop_Book_Project.Modals;
using System.IO;

namespace Develop_Book_Project
{
    class Program
    {
        static void Main(string[] args)
        {
            List<AptechBook> bookList = new List<AptechBook>();
            int choose = 0;
            do
            {
                showMenu();
                choose = int.Parse(Console.ReadLine());
                switch (choose)
                {
                    case 1:
                        Console.WriteLine("Nhap so luong sach muon them:");
                        int n = int.Parse(Console.ReadLine());
                        for (int i = 0; i < n; i++)
                        {
                            Console.WriteLine("Nhap thong tin cho sach thu " + (i + 1) + ":");
                            AptechBook book = new AptechBook();
                            book.input();
                            bookList.Add(book);
                        }
                        break;
                    case 2:
                        for (int i = 0; i < bookList.Count; i++)
                        {
                            Console.WriteLine("Thong tin quyen sach thu " + (i + 1) + ":");
                            bookList[i].display();
                        }
                        break;
                    case 3:
                        bookList.Sort((o1, o2) =>
                        {
                            return -o1.yearPublishing.CompareTo(o2.yearPublishing);
                        });
                        for (int i = 0; i < bookList.Count; i++)
                        {
                            Console.WriteLine("Thong tin quyen sach thu " + (i + 1) + ":");
                            bookList[i].display();
                        }
                        break;
                    case 4:
                        Console.WriteLine("Nhap ten sach can tim kiem:");
                        string bookName = Console.ReadLine();
                        int check = 0;
                        foreach (AptechBook b in bookList)
                        {
                            if(b.bookName == bookName)
                            {
                                check++;
                                b.display();
                            }
                        }
                        if (check == 0) Console.WriteLine("Khong tim thay!!");
                        break;
                    case 5:
                        Console.WriteLine("Nhap ten tac gia can tim kiem:");
                        string bookAuthor = Console.ReadLine();
                        int check1 = 0;
                        foreach (AptechBook b in bookList)
                        {
                            if (b.bookAuthor == bookAuthor)
                            {
                                check1++;
                                b.display();
                            }
                        }
                        if (check1 == 0) Console.WriteLine("Khong tim thay!!");
                        break;
                    case 6:
                        string filepath1 = "aptechbook.dat";
                        using(Stream stream = File.Open(filepath1, FileMode.Create))
                        {
                            var binaryFormatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                            binaryFormatter.Serialize(stream, bookList);
                        }
                        Console.WriteLine("Luu file thanh cong!!");
                        break;
                    case 7:
                        string filepath = "aptechbook.dat";
                        using (Stream stream = File.Open(filepath, FileMode.Open))
                        {
                            var binaryFormatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                            bookList = (List<AptechBook>)binaryFormatter.Deserialize(stream);
                        }
                        Console.WriteLine("Lay du lieu tu file thanh cong!!");
                        break;
                    case 8:
                        Console.WriteLine("Tam biet!!");
                        break;
                    default:
                        Console.WriteLine("Nhap sai!!");
                        break;
                }
            } while (choose != 8);
        }
        static private void showMenu()
        {
            Console.WriteLine("Lua chon chuong trinh:");
            Console.WriteLine("1.Nhap thong tin N cuon sach cua Aptech");
            Console.WriteLine("2.Hien thi thong tin vua nhap");
            Console.WriteLine("3.Sap xep thong tin giam dan theo nam xuat ban va hien thi");
            Console.WriteLine("4.Tim kiem theo ten sach");
            Console.WriteLine("5.Tim kiem theo ten tac gia");
            Console.WriteLine("6.Luu thong tin da nhap vao file");
            Console.WriteLine("7.Doc noi dung tu file va luu vao mang quan ly sach");
            Console.WriteLine("8.Thoat");
        }
    }
}

#AptechBook.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace Develop_Book_Project.Modals
{
    [Serializable]
    class AptechBook : Book
    {
        public String language { get; set; }
        public int semester { get; set; }
        public AptechBook()
        {

        }
        public AptechBook(String bookName, String bookAuthor, String producer, int yearPublishing, float price, String language, int semester) : base(bookName,bookAuthor,producer,yearPublishing,price) 
        {
            this.language = language;
            this.semester = semester;
        }
        public override void input()
        {
            base.input();
            Console.WriteLine("Ngon ngu:");
            language = Console.ReadLine();
            Console.WriteLine("Hoc ki:");
            semester = int.Parse(Console.ReadLine());
        }
        public override void display()
        {
            Console.WriteLine("Sach: {0}, Tac gia: {1}, NSX: {2}, Nam: {3}, Gia: {4}, Ngon ngu: {5}, Hoc ki: {6}", bookName, bookAuthor, producer, yearPublishing, price,language,semester);
        }
    }
}

#Book.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace Develop_Book_Project.Modals
{
    [Serializable]
    class Book
    {
        public String bookName { get; set; }
        public String bookAuthor { get; set; }
        public String producer { get; set; }
        public int yearPublishing { get; set; }
        public float price { get; set; }
        public Book()
        {

        }
        public Book(String bookName, String bookAuthor, String producer, int yearPublishing, float price)
        {
            this.bookName = bookName;
            this.bookAuthor = bookAuthor;
            this.producer = producer;
            this.yearPublishing = yearPublishing;
            this.price = price;
        }
        public virtual void input()
        {
            Console.WriteLine("Ten sach:");
            bookName = Console.ReadLine();
            Console.WriteLine("Ten tac gia:");
            bookAuthor = Console.ReadLine();
            Console.WriteLine("Nha san xuat:");
            producer = Console.ReadLine();
            Console.WriteLine("Nam san xuat:");
            yearPublishing = int.Parse(Console.ReadLine());
            Console.WriteLine("Gia tien:");
            price = float.Parse(Console.ReadLine());
        }
        public virtual void display()
        {
            Console.WriteLine("Sach: {0}, Tac gia: {1}, NSX: {2}, Nam: {3}, Gia: {4}", bookName, bookAuthor, producer, yearPublishing, price);
        }
    }
}

2020-06-29 07:53:18

using System;
using System.Collections.Generic;
using System.Text;

namespace Project1
{
    class Book
    {
        
        public String BookName{ get; set; }
        public String BookAuthor { get; set; }
        public String Producer { get; set; }
        public int YearPublishing { get; set; }
        public float Price { get; set; }

        public Book()
        {
        }

        public virtual void Input()
        {
            Console.WriteLine("Input Name of the Book: ");
            this.BookName = Console.ReadLine();
            Console.WriteLine("Input Book's Author: ");
            this.BookAuthor = Console.ReadLine();
            Console.WriteLine("Input Producer: ");
            this.Producer = Console.ReadLine();
            Console.WriteLine("Input YearPublishing: ");
            this.YearPublishing = int.Parse(Console.ReadLine());
            Console.WriteLine("Input Price: ");
            this.Price = float.Parse(Console.ReadLine());
        }

        public virtual void Display()
        {
            Console.WriteLine("Book's Name: " + BookName);
            Console.WriteLine("Author: " + BookAuthor);
            Console.WriteLine("Producer: " + Producer);
            Console.WriteLine("YearPublishing: " + YearPublishing);
            Console.WriteLine("Price: " + Price);
        }

        public Book(string BookName, string BookAuthor, string Producer, int YearPublishing, float Price)
        {
            this.BookName = BookName;
            this.BookAuthor = BookAuthor;
            this.Producer = Producer;
            this.YearPublishing = YearPublishing;
            this.Price = Price;
        }
    }

}
-------------------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Text;

namespace Project1
{
    class AptechBook : Book
    {
        public String language { get; set; }
        public int semester { get; set; }

        public AptechBook()
        {

        }

        public AptechBook(string BookName, string BookAuthor, string Producer, int YearPublishing, float Price, string language, int semester):base( BookName,  BookAuthor,  Producer,  YearPublishing, Price)
        {
            this.language = language;
            this.semester = semester;
        }

        public override void Display()
        {
            base.Display();
            Console.WriteLine("Language: " + language);
            Console.WriteLine("Semester: " + semester);
        }

        public override void Input()
        {
            base.Input();
            Console.WriteLine("Input Language: ");
            this.language = Console.ReadLine();
            Console.WriteLine("Semester: ");
            this.semester = int.Parse(Console.ReadLine());
        }
    }
}
-------------------------------------------------------------------------------------
using System;
using System.Collections.Generic;

namespace Project1
{
    class Test
    {
        static void Main(string[] args)
        {
            Console.OutputEncoding = System.Text.Encoding.Unicode;
            List<AptechBook> ListBook = new List<AptechBook>();
            int choose;
            do
            {
                ShowMenu();
                choose = int.Parse(Console.ReadLine());
                switch (choose){
                    case 1:
                        Input(ListBook);
                        break;
                    case 2:
                        Show(ListBook);
                        break;
                    case 3:
                        Sort(ListBook);
                        break;
                    case 4:
                        SearchByName(ListBook);
                        break;
                    case 5:
                        SearchByAuthor(ListBook);
                        break;
                    case 6:
                        break;
                    case 7:
                        break;
                    case 8:
                        System.Environment.Exit(0);
                        break;
                }
            } while (choose != 8) ;
        }

        static void ShowMenu()
        {
            Console.WriteLine("1. Nhập thông tin n cuốn sách của Aptech");
            Console.WriteLine("2. Hiển thị thông tin vừa nhập");
            Console.WriteLine("3. Sắp xếp thông tin giảm dần theo năm xuất bản và hiển thị");
            Console.WriteLine("4. Tìm kiếm theo tên sách");
            Console.WriteLine("5. Tìm kiếm theo tên tác giả");
            Console.WriteLine("6. Lưu thông tin sách đã nhập vào file");
            Console.WriteLine("7. Đọc nội dung từ file và lưu vào mang quản lý sách");
            Console.WriteLine("8. Thoát");
            Console.WriteLine("Choose:");
        }

        static void Input(List<AptechBook> list)
        {
            Console.WriteLine("Nhập số sách cần thêm: ");
            int n = int.Parse(Console.ReadLine());
            for(int i= 0; i< n; i++)
            {
                AptechBook book = new AptechBook();
                book.Input();
                list.Add(book);
            }
        }

        static void Show(List<AptechBook> list)
        {
            for (int i = 0; i < list.Count; i++)
            {
               list[i].Display();
            }
        }

        static void Sort(List<AptechBook> list)
        {
            for (int i = 0; i < list.Count-1; i++)
            {
                for (int j = 1; j < list.Count; j++)
                {
                    if(list[i].YearPublishing < list[j].YearPublishing)
                    {
                        AptechBook temp = list[i];
                        list[i] = list[j];
                        list[j] = temp;
                    }
                }
            }

            for (int i = 0; i < list.Count; i++)
            {
                list[i].Display();
            }
        }

        static void SearchByName(List<AptechBook> list)
        {
            Console.WriteLine("Nhập tên sách cần tìm kiếm: ");
            String name = Console.ReadLine();
            int count = 0;
            for (int i = 0; i < list.Count; i++)
            {
                if (list[i].BookName.Equals(name))
                {
                    list[i].Display();
                    count++;
                }
            }
            if(count == 0)
            {
                Console.WriteLine("Không tìm thấy sách tên là : " + name);
            }
        }

        static void SearchByAuthor(List<AptechBook> list)
        {
            Console.WriteLine("Nhập tên sách cần tìm kiếm: ");
            String author = Console.ReadLine();
            int count = 0;
            for (int i = 0; i < list.Count; i++)
            {
                if (list[i].BookAuthor.Equals(author))
                {
                    list[i].Display();
                    count++;
                }
            }
            if (count == 0)
            {
                Console.WriteLine("Không tìm thấy sách của tác giả : " + author);
            }
        }
    }
}

2020-06-28 15:09:14

using System;

namespace qlsach
{
    public class Book
    {
        public Book()
        {
        }
        public Book(string bookName, string bookAuthor, string producer, int yearPublishing, float price)
        {
            this.BookName = bookName;
            this.BookAuthor = bookAuthor;
            this.Producer = producer;
            this.YearPublishing = yearPublishing;
            this.Price = price;
        }
        public string BookName { get; set; }
        public string BookAuthor { get; set; }
        public string Producer { get; set; }
        public int YearPublishing { get; set; }
        public float Price { get; set; }

        public virtual void Input()
        {
            Console.WriteLine("Input book name");
            BookName = Console.ReadLine();
            Console.WriteLine("Input book author");
            BookAuthor = Console.ReadLine();
            Console.WriteLine("Input producer");
            Producer = Console.ReadLine();
            Console.WriteLine("Input year publishing");
            YearPublishing = int.Parse(Console.ReadLine());
            Console.WriteLine("Input price");
            Price = float.Parse(Console.ReadLine());
        }

        public virtual void Output()
        {
            Console.WriteLine("Bookname : {0}", BookName);
            Console.WriteLine("Bookauthor : {0}", BookAuthor);
            Console.WriteLine("Producer : {0}", Producer);
            Console.WriteLine("Year publishing : {0}", YearPublishing);
            Console.WriteLine("Price: {0}", Price);
        }
    }
}

using System;

namespace qlsach
{
    public class AptechBook : Book
    {
        public AptechBook()
        {
            
        }
        public AptechBook(string bookName, string bookAuthor, string producer, 
            int yearPublishing, float price, string language, int semester) 
            : base(bookName, bookAuthor, producer, yearPublishing, price)
        {
            this.Language = language;
            this.Semester = semester;
        }
        public string Language { get; set; }
        public int Semester { get; set; }

        public override void Input()
        {
            base.Input();
            Console.WriteLine("Input language");
            this.Language = Console.ReadLine();
            Console.WriteLine("Input semester");
            this.Semester = int.Parse(Console.ReadLine());
        }

        public override void Output()
        {
            base.Output();
            Console.WriteLine("Language: {0}",Language);
            Console.WriteLine("Semester: {0}",Price);
        }
    }
}

using System;
using System.Collections.Generic;
namespace qlsach
{
    public class Test
    {
        static void Main(string[] args)
        {
            Test test = new Test();
            int choice = 0;
            do
            {
                test.ShowMenu();
                Console.WriteLine("Input your choice");
                choice = int.Parse(Console.ReadLine());
                switch (choice)
                {
                    case 1:
                        test.Input();
                        break;
                    case 2:
                        test.Output();
                        break;
                    case 3:
                        test.Sort();
                        break;
                    case 4:
                        test.SearchByBookName();
                        break;
                    case 5:
                        test.SearchByAuthor();
                        break;
                    case 6:
                        break;
                    case 7:
                        break;
                    case 8:
                        Console.WriteLine("Bye ...");
                        return;
                    default:
                        Console.WriteLine("Invalid input...");
                        break;
                }
            }
            while (choice != 8);
        }
        public List<Book> ListBook { get; private set; }

        public Test()
        {
            ListBook = new List<Book>();
        }

        public void Input()
        {
            Console.WriteLine("Input number of book");
            int n = int.Parse(Console.ReadLine());

            for (int i = 0; i < n; i++)
            {
                AptechBook aNewBook = new AptechBook();
                aNewBook.Input();
                ListBook.Add(aNewBook);
            }
        }

        public void Output()
        {
            Console.WriteLine("Book list information:");
            for (int i = 0; i < ListBook.Count; i++)
            {
                ListBook[i].Output();
            }
        }

        public void Sort()
        {
            for (int i = 0; i < ListBook.Count - 1; i++)
            {
                for (int j = i + 1; j < ListBook.Count; j++)
                {
                    if (ListBook[i].YearPublishing < ListBook[j].YearPublishing)
                    {
                        Book temp = ListBook[i];
                        ListBook[i] = ListBook[j];
                        ListBook[j] = temp;
                    }
                }
            }
            this.Output();
        }

        public void SearchByBookName()
        {
            Console.WriteLine("Input book name you want to search:");
            string bookName = Console.ReadLine();
            foreach (Book book in ListBook)
            {
                if (book.BookName.Equals(bookName))
                {
                    Console.WriteLine("Found the book:");
                    book.Output();
                    return;
                }
            }
            Console.WriteLine("Not found");
        }

        public void SearchByAuthor()
        {
            Console.WriteLine("Input author you want to search:");
            string author = Console.ReadLine();
            foreach (Book book in ListBook)
            {
                if (book.BookAuthor.Equals(author))
                {
                    Console.WriteLine("Found the book:");
                    book.Output();
                    return;
                }
            }
            Console.WriteLine("Not found");
        }

        public void ShowMenu()
        {
            Console.WriteLine("1. Nhập thông tin n cuốn sách của Aptech");
            Console.WriteLine("2. Hiển thị thông tin vừa nhập");
            Console.WriteLine("3. Sắp xếp thông tin giảm dần theo năm xuất bản và hiển thị");
            Console.WriteLine("4. Tìm kiếm theo tên sách");
            Console.WriteLine("5. Tìm kiếm theo tên tác giả");
            Console.WriteLine("6. Lưu thông tin sách đã nhập vào file");
            Console.WriteLine("7. Đọc nội dung từ file và lưu vào mang quản lý sách");
            Console.WriteLine("8. Thoát.");
        }
    }
}

2020-06-27 05:59:25

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Baitap
{
    class Program
    {
        static void Main(string[] args)
        {
            List<AptachBook> Listbook = new List<AptachBook>();
            int choose = 0;
            int n;
            while (choose != 6)
            {
                showmenu();
                choose = int.Parse(Console.ReadLine());
                switch (choose)
                {
                    case 1:
                        Console.WriteLine("please enter N = ");
                         n = int.Parse(Console.ReadLine());
                        for(int i = 0; i< Listbook.Count; i++)
                        {
                            Console.WriteLine("book : "+ (i + 1));
                            AptachBook book1 = new AptachBook();
                            book1.input();
                            Listbook.Add(book1);
                        }
                        break;
                    case 2:
                        for (int i = 0; i < Listbook.Count; i++)
                        {
                            Console.WriteLine("book : " + (i + 1));
                            Listbook[i].disalay();
                        }
                        break;
                    case 3:
                        for (int i = 0; i < Listbook.Count; i++)
                        {
                            for (int j = i + 1; j < Listbook.Count; j++)
                            {
                                if (Listbook[i].Price < Listbook[j].Price)
                                {
                                    //cach trao doi gia tri
                                    AptachBook tmp = Listbook[i];
                                    Listbook[i] = Listbook[j];
                                    Listbook[j] = tmp;
                                }
                            }
                        }
                        for (int i = 0; i < Listbook.Count; i++)
                        {
                            Console.WriteLine("book : " + (i + 1));
                            Listbook[i].disalay();
                        }
                        break;
                    case 4:
                        Console.WriteLine("TIM KIEM TEN SACH :");
                        string seach = Console.ReadLine();
                        for (int i = 0; i < Listbook.Count; i++)
                        {
                            if (Listbook[i].BookName .Equals(seach) ){
                                Listbook[i].disalay();
                            }
                        }
                        break;
                    case 5:
                        Console.WriteLine("TIM KIEM TEN TAC GIA :");
                        string seachs = Console.ReadLine();
                        for (int i = 0; i < Listbook.Count; i++)
                        {
                            if (Listbook[i].BookAuthor.Equals(seachs) ){
                                Listbook[i].disalay();
                            }
                        }
                        break;
                    case 6:
                        Console.WriteLine("bye");
                        break;
                    default:
                        Console.WriteLine("Lua chon sai");
                        break;
                }
            }
    }
        public static void showmenu()
        {
            Console.WriteLine("************************");
            Console.WriteLine(" 1. Insert n book");
            Console.WriteLine("2. Display");
            Console.WriteLine("3. Sort");
            Console.WriteLine("4. Search by Name");
            Console.WriteLine("5. Search by Author");
            Console.WriteLine("6. Exit");
            Console.Write("Choose: ");
        }
   }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Baitap
{
    class AptachBook : book
    {
        public String Language { get; set; }
        public String Semester { get; set; }

        public AptachBook()
        {
        }

        public AptachBook(string bookName, string bookAuthor, string producer, int yearPublishing, float price ,string language, string semester) : base ( bookName,  bookAuthor,  producer,  yearPublishing, price)
        {
            Language = language;
            Semester = semester;
        }
        public override void input()
        {
            base.input();
            Console.WriteLine("please enter language  : ");
            Language = Console.ReadLine();
            Console.WriteLine("Pleasw enter semester : ");
            Semester = Console.ReadLine();
        }
        public  void disalay()
        {
            base.disalay();
            Console.WriteLine(" language  : "+Language);
            Console.WriteLine("semester : "+Semester);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Baitap
{
    class book

    {
        //   private String bookName;
        public string BookName { get; set; }

        //  private String bookAuthor;
        public string BookAuthor { get; set; }
        // private String producer;
        public string Producer { get; set; }
        // private int yearPublishing;
        public int YearPublishing { get; set; }

        private float _price;
        public float Price
        {
            get
            {
                return _price;
            }

            set
            {
                if (value >= 0)
                {
                    _price = value;
                }
                else
                {
                    Console.WriteLine("Cai dat price sai");
                }
            }
        }

        public book()
        {
        }

        public book(string bookName, string bookAuthor, string producer, int yearPublishing, float price)
        {
            BookName = bookName;
            BookAuthor = bookAuthor;
            Producer = producer;
            YearPublishing = yearPublishing;
            Price = price;
        }
        public virtual void input()
        {
            Console.WriteLine("Please enter a title : ");
            BookName = Console.ReadLine();
            Console.WriteLine("Please enter the author's name : ");
            BookAuthor = Console.ReadLine();
            Console.WriteLine("Please enter the manufacturer  : ");
            Producer = Console.ReadLine();
            Console.WriteLine("Please enter the year of publication  : ");
            YearPublishing = int.Parse(Console.ReadLine());
            Console.WriteLine("Please enter the price : ");
            Price = float.Parse(Console.ReadLine());
        }
        public void disalay() {
            Console.WriteLine("the name of the book is : "+ BookName);
            Console.WriteLine("the author's name is  : "+ BookAuthor);
            Console.WriteLine("manufacturer is : "+ Producer);
            Console.WriteLine("year of publication was :  "+ YearPublishing);
            Console.WriteLine("Price is : "+ Price);
  


        }
    }
}

2020-06-26 16:09:01

using System;
using System.Collections.Generic;
using System.Text;

namespace BookManager
{
    class AptechBook: Book
    {
        private string _language;
        public string Language {
            get {
                return _language;
            }
            set {
                _language = value;
            }
        }
        private int _semester;
        public int Semester {
            get {
                return _semester;
            }
            set {
                if (value >= 0) {
                    _semester = value;
                }
            }
        }

        public  AptechBook  (string bookname, string bookauthor, string producer, int yearpublishing, float price,string language, int semester) : base( bookname,  bookauthor,  producer,  yearpublishing,  price)
        {
            Language = language;
            Semester = semester;
        }

        public AptechBook()
        {
        }

        public override void input()
        {
            base.input();
            Console.WriteLine("Enter language : ");
            Language = Console.ReadLine();
            Console.WriteLine("Enter semester : ");
            Semester = int.Parse(Console.ReadLine());
        }
        public override void display()
        {
            base.display();
            Console.Write(", Language {0} , Semester {1} \n",Language,Semester);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;

namespace BookManager
{
    class Book
    {
        

        private string _bookname, _bookauthor, _producer;
        public string BookName{
            get {
                return _bookname;
            }
            set {
                _bookname = value;
            }
        }
        public string BookAuthor
        {
            get
            {
                return _bookauthor;
            }
            set
            {
                _bookauthor = value;
            }
        }
        public string Producer
        {
            get
            {
                return _producer;
            }
            set
            {
                _producer = value;
            }
        }
        private int _yearpublishing;
        public int YearPublishing {
            get {
                return _yearpublishing;
            }
            set {
                if (value >= 0) {
                    _yearpublishing = value;
                }
            }
        }
        private float _price;
        public float Price {
            get {
                return _price;
            }
            set {
                if (value >= 0) {
                    _price = value;
                }
            }
        }

        public  Book(string bookname, string bookauthor, string producer, int yearpublishing, float price)
        {
            _bookname = bookname;
            _bookauthor = bookauthor;
            _producer = producer;
            _yearpublishing = yearpublishing;
            _price = price;
        }
        public Book() { }

        public virtual void input() {
            Console.WriteLine("Enter book name : ");
            this.BookName = Console.ReadLine();
            Console.WriteLine("Enter book author : ");
            this.BookAuthor = Console.ReadLine();
            Console.WriteLine("Enter producer : ");
            this.Producer = Console.ReadLine();
            Console.WriteLine("Enter year publishing : ");
            this.YearPublishing = int.Parse(Console.ReadLine());
            Console.WriteLine("Enter price : ");
            this.Price = float.Parse(Console.ReadLine());
        }
        public virtual void display() {
            Console.Write("Book Name : {0} , Author : {1} , Producer : {2} , Year Publishing : {3} , Price : {4}", BookName,BookAuthor,Producer,YearPublishing,Price);
            
        }
        
        
    }
}

using System;
using System.Collections.Generic;
using System.Net;

namespace BookManager
{
    class Program
    {
        static void Menu() {
            Console.WriteLine("1. Nhập thông tin n cuốn sách của Aptech");
            Console.WriteLine("2. Hiển thị thông tin vừa nhập");
            Console.WriteLine("3. Sắp xếp thông tin giảm dần theo năm xuất bản và hiển thị");
            Console.WriteLine("4. Tìm kiếm theo tên sách");
            Console.WriteLine("5. Tìm kiếm theo tên tác giả");
            Console.WriteLine("6. Lưu thông tin sách đã nhập vào file");
            Console.WriteLine("7. Đọc nội dung từ file và lưu vào mang quản lý sách");
            Console.WriteLine("8. Thoát.");
        }
        static void Input(List<AptechBook> aptechBooks) {
            Console.WriteLine("Enter number of book : ");
            int n = int.Parse(Console.ReadLine());
            for (int i = 0; i < n; i++) {
                Console.WriteLine("Enter book {0} information", (i + 1));
                AptechBook aptechBook = new AptechBook();
                aptechBook.input();
                aptechBooks.Add(aptechBook);
            }
        }
        static void Show(List<AptechBook> aptechBooks) {
            int length = aptechBooks.Count;
            for (int i = 0; i < length; i++) {
                aptechBooks[i].display();
            }

        }
        static void Sort(List<AptechBook> aptechBooks) {
            int length = aptechBooks.Count;
            for (int i = 0; i < length; i++) {
                for (int j = i + 1; j < length; j++) {
                    if (aptechBooks[i].YearPublishing > aptechBooks[j].YearPublishing) {
                        AptechBook temp = aptechBooks[i];
                        aptechBooks[i] = aptechBooks[j];
                        aptechBooks[j] = temp;
                    }
                }
            }
            for (int i = 0; i < length; i++) {
                aptechBooks[i].display();
            }
        }
        static void FindByBookName(List<AptechBook> aptechBooks)
        {
            Console.WriteLine("Enter book name : ");
            int length = aptechBooks.Count;
            string BookName = Console.ReadLine();
            for (int i = 0; i < length; i++)
            {
                if (BookName == aptechBooks[i].BookName) {
                    aptechBooks[i].display();
                }
            }
        }
        static void FindByAuthor(List<AptechBook> aptechBooks)
        {
            Console.WriteLine("Enter author name : ");
            int length = aptechBooks.Count;
            string Author = Console.ReadLine();
            for (int i = 0; i < length; i++)
            {
                if (Author == aptechBooks[i].BookAuthor)
                {
                    aptechBooks[i].display();
                }
            }
        }
        static void Main(string[] args)
        {
            List<AptechBook> aptechBooks = new List<AptechBook>();
            while (true) {
                Menu();
                int choice = int.Parse(Console.ReadLine());
                switch (choice) {
                    case 1:
                        Input(aptechBooks);
                        break;
                    case 2:
                        Show( aptechBooks);
                        break;
                    case 3:
                        Sort( aptechBooks);
                        break;
                    case 4:
                        FindByBookName(aptechBooks);
                        break;
                    case 5:
                        FindByAuthor(aptechBooks);
                        break;
                    case 6:
                        break;
                    case 7:
                        break;
                    case 8:
                        return;
                }
            }
        }
    }
}

2020-06-26 14:03:50

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BT
{
    class Test
    {
        static void Main(string[] args)
        {
            List<AptechBook> list = new List<AptechBook>();
            while (true)
            {
                showMenu();
                int choose = int.Parse(Console.ReadLine());
                switch (choose)
                {
                    case 1:
                        Console.Write("Insert n = ");
                        int n = int.Parse(Console.ReadLine());
                        for (int i=0; i < n; i++)
                        {
                            Console.WriteLine("\nBook "+(i+1));
                            AptechBook apt = new AptechBook();
                            apt.input();
                            list.Add(apt);
                        }
                        break;
                    case 2:
                        for (int i = 0; i < list.Count; i++)
                        {
                            list[i].display();
                        }
                        break;
                    case 3:
                        for (int i = 0; i < list.Count-1; i++)
                        {
                            for (int j = i + 1; j < list.Count; j++)
                            {
                                if (list[i].YearPublishing < list[j].YearPublishing)
                                {
                                    AptechBook tmp = list[i];
                                    list[i] = list[j];
                                    list[j] = tmp;
                                }
                            }
                        }
                        Console.WriteLine("sorted!!");
                        break;
                    case 4:
                        Console.WriteLine("Insert Book: ");
                        string search = Console.ReadLine();

                        for (int i = 0; i < list.Count; i++)
                        {
                            if (list[i].Equals(search))
                            {
                                list[i].display();
                                break;
                            }
                        }
                        break;
                    case 5:
                        Console.WriteLine("Insert Author: ");
                        string searchAuthor = Console.ReadLine();

                        for (int i = 0; i < list.Count; i++)
                        {
                            if (list[i].Equals(searchAuthor))
                            {
                                list[i].display();
                                break;
                            }
                        }
                        break;
                    case 6:
                        break;
                    case 7:
                        break;
                    case 8:
                        Environment.Exit(0);
                        break;
                }

            }
        }

        static void showMenu()
        {
            Console.WriteLine("\n1. Insert n book");
            Console.WriteLine("2. Display");
            Console.WriteLine("3. Sort");
            Console.WriteLine("4. Search by Name");
            Console.WriteLine("5. Search by Author");
            Console.WriteLine("6. Save");
            Console.WriteLine("7. Read");
            Console.WriteLine("8. Exit");
            Console.Write("Choose: ");
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BT
{
    class Book
    {

        public string Bookname { get; set; }

        public string BookAuthor { get; set; }

        public string Producer { get; set; }

        public int YearPublishing { get; set; }

        private float price;
        public float Price {
            get{
                return price;
            }
            set{
                if (value > 0)
                {
                    price = value;
                }
                else
                {
                    Console.WriteLine("Invalid Input");
                }
            }
        }

        public Book()
        {
        }

        public Book(string bookName, string bookAuthor, string producer, int yearPublishing, float price)
        {
            this.Bookname = bookName;
            this.BookAuthor = bookAuthor;
            this.Producer = producer;
            this.YearPublishing = yearPublishing;
            this.price = price;
        }

        public virtual void input()
        {
            Console.Write("Insert bookName: ");
            Bookname = Console.ReadLine();
            Console.Write("Insert bookAuthor: ");
            BookAuthor = Console.ReadLine();
            Console.Write("Insert producer: ");
            Producer = Console.ReadLine();
            Console.Write("Insert yearPublishing: ");
            YearPublishing = int.Parse(Console.ReadLine());
            Console.Write("Insert price: ");
            price = float.Parse(Console.ReadLine());
        }
        
        public virtual void display()
        {
            Console.WriteLine("bookName=" + Bookname + "; bookAuthor=" + BookAuthor + "; producer=" + Producer + "; yearPublishing=" + YearPublishing + "; price=" + price);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BT
{
    class AptechBook : Book
    {
        public string Language { get; set; }
        public int Semester { get; set; }

        public override void input()
        {
            base.input();
            Console.Write("Insert language: ");
            Language = Console.ReadLine();
            Console.Write("Insert semester: ");
            Semester = int.Parse(Console.ReadLine());
        }

        public override void display()
        {
            base.display();
            Console.WriteLine("language=" + Language + "; semester=" + Semester);

        }

        public AptechBook()
        {

        }

        public AptechBook(string bookName, string bookAuthor, string producer, int yearPublishing, float price, string language, int semester) : base(bookName, bookAuthor, producer, yearPublishing, price)
        {
            this.Language = language;
            this.Semester = semester;
        }
    }
}

2020-05-25 00:02:24

#AptechBook.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace Lesson5
{
    class AptechBook : Book
    {
        private string language;

        private int semester;

        public string Language { get; set; }
        public int Semester { get; set; }
        
        public AptechBook() { }
       public AptechBook(string bookname, string bookAuthor, string producer, int yearPublishing, float price,
           string language, int semester) : base(bookname, bookAuthor, producer, yearPublishing, price)
        {
            Language = language;
            Semester = semester;
        }
        public override void input()
        {
            base.input();
            Console.WriteLine("input Language");
            Language = Console.ReadLine();
            Console.WriteLine("input Semester");
            Semester = Convert.ToInt32(Console.ReadLine());
        }
        public override void display()
        {
            base.display();
            Console.Write("Language ={0}, Semester= {1}\n",Language,Semester);
        }
        public string getString()
        {
            return "bookName =" + BookName + ", bookAuthor =" + BookAuthor + ", producer =" + Producer + ", yearPublishing ="
                + YearPublishing + ",price =" + Price + ",Language ="+Language+ ",Semester="+Semester+"\n";

        }

    }
}

#Book.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace Lesson5
{
    class Book
    {
        public string bookName;

        public string bookAuthor;

        public string producer;

        public int yearPublishing;

        public float price;

        public string BookName { get; set; }
        public string BookAuthor { get; set; }
        public string Producer { get; set; }
        public int YearPublishing { get; set; }
        public float Price { get; set; }

        public Book() { }
        public Book(string bookname,string bookAuthor,string producer,int yearPublishing, float price)
        {
            BookName = bookname;
            BookAuthor = bookAuthor;
            Producer = producer;
            YearPublishing = yearPublishing;
            Price = price;
        }
        public virtual void display()
        {
            Console.Write("\nbookName = {0}, bookAuthor = {1}, producer = {2}, yearPublishing = {3},price = {4}",
                BookName,BookAuthor,Producer,YearPublishing,Price);
        }
        public virtual void input()
        {
            Console.WriteLine("Input bookName");
            BookName = Console.ReadLine();
            Console.WriteLine("Input BookAuthor");
            BookAuthor = Console.ReadLine();
            Console.WriteLine("Input producer");
            Producer = Console.ReadLine();
            Console.WriteLine("Input YearPublishing");
            YearPublishing = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Input Price");
            Price = float.Parse(Console.ReadLine());
        }
      

    }
}

#Manage.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Lesson5
{
    class Manage
    {

        //ham input aptechbook
        public static void input(List<AptechBook> list)
        {
            Console.WriteLine("Nhap N thong tin cuon sach AptechBook");
            int n = Convert.ToInt32(Console.ReadLine());
            for (int i = 0; i < n; i++)
            {
                AptechBook book = new AptechBook();
                book.input();
                list.Add(book);
            }
        }

        //ham hien thi thong tin vua nhap
        public static void display(List<AptechBook> list)
        {
            Console.WriteLine("Danh sach thong tin sach");
            foreach (var item in list)
            {
                item.display();
            }
        }

        //ham
        public static void sortYear(List<AptechBook> list)
        {
            Console.WriteLine("Sap xep theo nam san xuat giam dan");
            list.Sort(new SortByYear());
            display(list);
        }
        //tim kiem theo ten sach
        public static void searchNameBook(List<AptechBook> list)
        {
            Console.WriteLine("nhap name book can tim");
            string name = Console.ReadLine();
            AptechBook book = null;
            foreach (var item in list)
            {
                if (item.BookName.Equals(name))
                {
                    book = item;
                    break;
                }
            }
            if(book != null)
            {
                book.display();
                return;
            }
            Console.WriteLine("namebook = {0} khong ton tai",name);
        }
        //tim sach theo ten tac gia
        public static void searchAuthorBook(List<AptechBook> list)
        {
            Console.WriteLine("nhap name book can tim");
            string name = Console.ReadLine();
            AptechBook book = null;
            foreach (var item in list)
            {
                if (item.BookAuthor.Equals(name))
                {
                    book = item;
                    break;
                }
            }
            if (book != null)
            {
                book.display();
                return;
            }
            Console.WriteLine("AuthorBook = {0} khong ton tai", name);
        }

        //
        public static void writeFile(List<AptechBook> list)
        {
            FileStream fs = new FileStream("demo.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read);
            //string str = "smileahjhj do thien phu";

            //chuyen thanh mang byte theo ma utf8
            foreach (var item in list)
            {
                byte[] b = Encoding.UTF8.GetBytes(item.getString());
                fs.Write(b, 0, b.Length);
            }
            

            //ghi xuong file
           
            Console.WriteLine("write finish");
            //dong stream
            fs.Close();

        }
        //readFile

        public static void readFile()

        {
            string data = string.Empty;
            using(StreamReader str = new StreamReader("demo.txt"))
            {
                while((data = str.ReadLine()) != null)
                {
                    Console.WriteLine(data);
                }
            }
            Console.WriteLine("read file close");
        }

    }
}

#Program.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace Lesson5
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.OutputEncoding = Encoding.UTF8;
            List<AptechBook> listbook = new List<AptechBook>();
            int choose;


            do
            {
                showmenu();
                choose = Convert.ToInt32(Console.ReadLine());
                switch (choose)
                {
                    case 1:
                        Manage.input(listbook);
                        break;
                    case 2:
                        Manage.display(listbook);
                        break;
                    case 3:
                        Manage.sortYear(listbook);
                        break;
                    case 4:
                        Manage.searchNameBook(listbook);
                        break;
                    case 5:
                        Manage.searchAuthorBook(listbook);
                        break;
                    case 6:
                        Manage.writeFile(listbook);
                        break;
                    case 7:
                        Manage.readFile();
                        break;
                    case 8:
                        Console.WriteLine("Exit success");
                        break;
                    default:
                        Console.WriteLine("Chon tu 1 -8 , chon lai di");
                        break;

                }

            } while (choose != 8);
        }
        public static void showmenu()
        {
            Console.WriteLine("1.    Nhập thông tin n cuốn sách của Aptech");
            Console.WriteLine("2.    Hiển thị thông tin vừa nhập");
            Console.WriteLine("3.    Sắp xếp thông tin giảm dần theo năm xuất bản và hiển thị");
            Console.WriteLine("4.    Tìm kiếm theo tên sách");
            Console.WriteLine("5.    Tìm kiếm theo tên tác giả");
            Console.WriteLine("6. Lưu thông tin sách đã nhập vào file");
            Console.WriteLine("7. Đọc nội dung từ file và lưu vào mang quản lý sách");
            Console.WriteLine("8. Thoat");
            Console.WriteLine("Choose:");


        }
    }
}

#SortByYear.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace Lesson5
{
  
        class SortByYear : IComparer<AptechBook> // ke thua interface Icomparer
    {
        
            public int Compare(AptechBook x, AptechBook y)
            {
            return x.YearPublishing > y.YearPublishing ? -1 : 1;
            }
        

    
    }
}

2020-05-23 12:10:01

#Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;

namespace Quanlisach
{
    class Program
    {
        static void Main(string[] args)
        {
            Test();
        }

        static public void Test()
        {
            List<AptechBook> listbook = new List<AptechBook>();
            int choose;

            do
            {
                Menu();
                Console.Write("Choose: ");
                choose = int.Parse(Console.ReadLine());
                switch (choose)
                {
                    case 1:
                        Console.Write("Enter n: ");
                        int n = int.Parse(Console.ReadLine());
                        for (int i = 1; i <= n; i++)
                        {
                            AptechBook aptechBook = new AptechBook();
                            Console.WriteLine("===============");
                            Console.WriteLine("Enter Book {0}: ", i);
                            aptechBook.input();
                            listbook.Add(aptechBook);
                        }
                        break;
                    case 2:
                        Console.WriteLine("Show Infor:");
                        showInfor(listbook);
                        break;
                    case 3:
                        Sort(listbook);
                        showInfor(listbook);
                        break;
                    case 4:
                        Console.Write("Enter bookName: ");
                        string search = Console.ReadLine();
                        AptechBook book = findBybookName(search, listbook);
                        Console.WriteLine("=================");
                        book.output();
                        break;
                    case 5:
                        Console.Write("Enter bookAuthor: ");
                        search = Console.ReadLine();
                        AptechBook author = findBybookAuthor(search, listbook);
                        Console.WriteLine("=================");
                        author.output();
                        break;
                    case 6:
                        FileStream fs = new FileStream("E:/C#/quanlisach.txt", FileMode.Create);
                        StreamWriter sWriter = new StreamWriter(fs, Encoding.UTF8);
                        foreach (var item in listbook)
                        {
                            sWriter.WriteLine(item.toString());
                        }
                        sWriter.Flush();
                        fs.Close();
                        break;
                    case 7:
                        string[] lines = File.ReadAllLines(@"E:/C#/quanlisach.txt");
                        foreach (string s in lines)
                        {
                            Console.WriteLine(s);
                        }
                        Console.ReadLine();
                        break;
                    case 8:
                        Console.WriteLine("Exit");
                        break;
                    default:
                        Console.WriteLine("ERROR");
                        break;

                }
            } while (choose != 8);
        }
        static public void Menu()
        {
            Console.WriteLine("==============================MENU===============================");
            Console.WriteLine("1. Enter information n book of Aptech");
            Console.WriteLine("2. Displays the information");
            Console.WriteLine("3. Sort information descending by publication year");
            Console.WriteLine("4. Search by bookName");
            Console.WriteLine("5. Search by bookAuthor");
            Console.WriteLine("6. Save file");
            Console.WriteLine("7. Read contents from file and save into book management array");
            Console.WriteLine("8. Exit");
            Console.WriteLine("================================================================");
        }
        static public void showInfor(List<AptechBook> listbook)
        {
            int showinfor = 0;
            foreach (var item in listbook)
            {
                ++showinfor;
                Console.WriteLine("=================");
                Console.WriteLine("Information book {0}: ", showinfor);
                item.output();
            }
        }
        static public void Sort(List<AptechBook> listbook)
        {
            listbook.Sort((x, y) => x.yearPublishing.CompareTo(y.yearPublishing));
        }
        static AptechBook findBybookName(String search, List<AptechBook> listbook)
        {
            AptechBook aptechBook = new AptechBook();
            foreach (var item in listbook)
            {
                if (item.bookName.Equals(search))
                {
                    aptechBook = item;
                    break;
                }
            }
            return aptechBook;
        }
        static AptechBook findBybookAuthor(String search, List<AptechBook> listbook)
        {
            AptechBook aptechBook = new AptechBook();
            foreach (var item in listbook)
            {
                if (item.bookAuthor.Equals(search))
                {
                    aptechBook = item;
                    break;
                }
            }
            return aptechBook;
        }
    }
}

#AptechBook.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace Quanlisach
{
    class AptechBook : Book
    {
        private string _language;
        private int _semester;

        public string language { get; set; }
        public int semester { get; set; }

        public AptechBook()
        {

        }
        public AptechBook(String laguage, int semester)
        {
            this.language = language;
            this.semester = semester;
        }
        public override void input()
        {
            base.input();
            Console.Write("Enter language: ");
            language = Console.ReadLine();
            Console.Write("Enter semester: ");
            semester = int.Parse(Console.ReadLine());
        }
        public override void output()
        {
            base.output();
            Console.WriteLine("Language: {0} \nSemester: {1}", language, semester);
        }
        public string toString()
        {
            return "bookName: " + bookName + "\nbookAuthor: " + bookAuthor + "\nProducer: " + producer + "\nYearPublishing: " + yearPublishing + "\nPrice: " + price;
        }

    }
}

#Book.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace Quanlisach
{
    class Book
    {
        private string _bookName;
        private string _bookAuthor;
        private string _producer;
        private int _yearPublishing;
        private float _price;

        public string bookName { get; set; }
        public string bookAuthor { get; set; }
        public string producer { get; set; }
        public int yearPublishing { get; set; }
        public float price { get; set; }

        public Book()
        {

        }
        public Book(String bookName, String bookAuthor, String producer, int yearPublishing, float price)
        {
            this.bookName = bookName;
            this.bookAuthor = bookAuthor;
            this.producer = producer;
            this.yearPublishing = yearPublishing;
            this.price = price;
        }
        public virtual void input()
        {
            Console.Write("Enter bookName: ");
            bookName = Console.ReadLine();
            Console.Write("Enter bookAuthor: ");
            bookAuthor = Console.ReadLine();
            Console.Write("Enter producer: ");
            producer = Console.ReadLine();
            Console.Write("Enter yearPublishing: ");
            yearPublishing = int.Parse(Console.ReadLine());
            Console.Write("Enter price: ");
            price = float.Parse(Console.ReadLine());
        }
        public virtual void output()
        {
            Console.WriteLine("bookName: {0} \nbookAuthor: {1} \nProducer: {2} \nYearPublishing: {3} \nPrice: {4}", bookName, bookAuthor, producer, yearPublishing, price); ;
        }



    }
}

2020-05-22 10:15:08

using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.IO;
namespace Book
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.OutputEncoding = Encoding.UTF8;
            Console.WriteLine("Hello World!");

            List<AptechBook> bookList = new List<AptechBook>();
            int c;
            do
            {
                menu();
                c = int.Parse(Console.ReadLine());
                switch (c)
                {
                    case 1:
                        Console.WriteLine("Nhap n : ");
                        int n = int.Parse(Console.ReadLine());
                        for (int i = 0; i < n; i++)
                        {
                            AptechBook aptechBook = new AptechBook();
                            aptechBook.input();
                            bookList.Add(aptechBook);
                        }

                        break;
                    case 2:
                        display(bookList);
                        break;
                    case 3:
                        sort(bookList);
                        display(bookList);
                        break;
                    case 4:
                        Console.WriteLine("nhap bookName de tim kiem :");
                        string search = Console.ReadLine();
                        AptechBook book = findBybookName(search, bookList);
                        book.display();
                        break;
                    case 5:
                        Console.WriteLine("nhap Author Name de tim kiem :");
                        search = Console.ReadLine();
                        AptechBook book1 = findBybookName(search, bookList);
                        book1.display();
                        break;
                    case 6:
                        FileStream fs = new FileStream("d:/C#/FileC#/test.txt", FileMode.Create);//Tạo file mới tên là test.txt            
                        StreamWriter sWriter = new StreamWriter(fs, Encoding.UTF8);//fs là 1 FileStream 
                        foreach (var item in bookList)
                        {
                            sWriter.WriteLine(item.toString());
                            
                        }
                        // Ghi và đóng file
                        sWriter.Flush();
                        fs.Close();
                        break;
                    case 7:

                        break;
                    case 8:
                        Console.WriteLine("End Program!!");
                        break;

                }

            } while (c != 8);

        }
        static void menu()
        {
            Console.WriteLine("********************************************");
            Console.WriteLine("1.    Nhập thông tin n cuốn sách của Aptech");
            Console.WriteLine("2.    Hiển thị thông tin vừa nhập");
            Console.WriteLine("3.    Sắp xếp thông tin giảm dần theo năm xuất bản và hiển thị");
            Console.WriteLine("4.    Tìm kiếm theo tên sách");
            Console.WriteLine("5.    Tìm kiếm theo tên tác giả");
            Console.WriteLine("6. Lưu thông tin sách đã nhập vào file");
            Console.WriteLine("7. Đọc nội dung từ file và lưu vào mang quản lý sách");
            Console.WriteLine("8.    Thoát.");
            Console.WriteLine("Chon : ");
        }
        static void sort(List<AptechBook> bookList)
        {
            bookList.Sort((x, y) => x.yearPublishing.CompareTo(y.yearPublishing));
        }
        static void display(List<AptechBook> bookList)
        {
            Console.WriteLine("********************************************");
            int stt = 0;
            foreach (AptechBook item in bookList)
            {
                ++stt;
                Console.WriteLine("thong tin cuon sach thu {0} : ", stt);
                item.display();
            }
        }
        static AptechBook findBybookName(string search, List<AptechBook> bookList)
        {
            AptechBook aptechBook = new AptechBook();
            foreach (var item in bookList)
            {
                if (item.bookName.Equals(search))
                {
                    aptechBook = item;
                    break;
                }
            }
            return aptechBook;
        }
        static AptechBook findByAuthorName(string search, List<AptechBook> bookList)
        {
            AptechBook aptechBook = new AptechBook();
            foreach (var item in bookList)
            {
                if (item.bookAuthor.Equals(search))
                {
                    aptechBook = item;
                    break;
                }
            }
            return aptechBook;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;

namespace Book
{
    class Book
    {
        private String _bookName { get; set; }

        private String _bookAuthor { get; set; }

        private String _producer { get; set; }

        private int _yearPublishing { get; set; }

        private float _price { get; set; }
        public int yearPublishing {
            get
            {
                return _yearPublishing;
            }
            set
            {
                _yearPublishing = value;
            }
            }
        public String bookName { get
            {
                return _bookName;
            }
            set
            {
                _bookName = value;
            }
        }
        public String bookAuthor {
            get
            {
                return _bookAuthor;
            }
            set {
                _bookAuthor = value;
            } }
        

        public String producer {
            get
            {
                return _producer;
            }
            set {
                _producer = value;
            }
            }

       

        public float price {
            get
            {
                return _price;
            }
            set {
                _price = value;
            } }
        public Book()
        {

        }
        public Book(String bookName, String bookAuthor, String producer, int yearPublishing, float price)
        {
            this._bookAuthor = bookAuthor;
            this._bookName = bookName;
            this._price = price;
            this._producer = producer;
            this._yearPublishing = yearPublishing;
        }
        public virtual void input()
        {
            Console.WriteLine("Enter Name of Book : ");
            _bookName = Console.ReadLine();
            Console.WriteLine("Enter Author of book : ");
            _bookAuthor = Console.ReadLine();
            Console.WriteLine("Enter Producer : ");
            _producer = Console.ReadLine();
            Console.WriteLine("Enter Year Publishing : ");
            _yearPublishing = int.Parse( Console.ReadLine());
            Console.WriteLine("Enter Price : ");
            _price = float.Parse(Console.ReadLine());
        }
        public virtual void display()
        {
            Console.WriteLine(" Name of Book : "+_bookName);
            Console.WriteLine("Author of book : "+_bookAuthor);
            Console.WriteLine("Producer : "+_producer);
            Console.WriteLine("Year Publishing : "+_yearPublishing);
            Console.WriteLine("Price : "+_price);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;

namespace Book
{
    class AptechBook : Book
    {
        private String language { get; set; }

        private int semester { get; set; }
        public AptechBook():base()
        {

        }
        public AptechBook(String bookName, String bookAuthor, String producer, int yearPublishing, float price,String language , int semester ):base()
        {
            this.language = language;
            this.semester = semester;
           
        }
        public override void input()
        {
            base.input();
            Console.WriteLine("Enter Language : ");
            language = Console.ReadLine();
            Console.WriteLine("Enter semester : ");
            semester = int.Parse(Console.ReadLine());
        }
        public override void display()
        {
            base.display();
            Console.WriteLine(" Language : "+language);
            Console.WriteLine(" semester : "+semester);

        }
        public string toString()
        {
            return "aptechBook{bookName : "+bookName + ", bookAuthor : "+bookAuthor+", Producer : "+producer+ ", yearPublishing : " + yearPublishing+", Price : "+price+", Language : "+language+", semester : "+semester+"}";
        }


    }
}

2020-05-22 09:55:06

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace Lession5
{
    class Test
    {
        
        public static void Main(String[] agrs)
        {
            Console.OutputEncoding = Encoding.Unicode;
            Console.InputEncoding = Encoding.Unicode;
            int chosse,N;
            List<AptechBook> listBook = new List<AptechBook>();
            
            do
            {
                showMenu();
                Console.Write("Nhap lua chon: ");
                chosse = Convert.ToInt32(Console.ReadLine());
                switch (chosse)
                {
                    case 1:
                        Console.Write("Nhap N: ");
                        N = Convert.ToInt32(Console.ReadLine());
                        AptechBook[] atb = new AptechBook[N];
                        for (int i = 0; i < N; i++)
                        {
                            atb[i] = new AptechBook();
                            atb[i].input();
                            listBook.Add(atb[i]);
                        }
                        break;
                    case 2:
                        foreach (AptechBook itemp in listBook)
                        {
                            itemp.display();
                        }
                        break;
                    case 3:
                        int temp;
                        foreach(AptechBook item in listBook)
                        {
                            foreach (AptechBook item1 in listBook)
                            {
                                if(item.YearPublishing > item1.YearPublishing)
                                {
                                    temp = item.YearPublishing;
                                    item.YearPublishing = item1.YearPublishing;
                                    item1.YearPublishing = temp;
                                }
                            }
                        }
                        foreach (AptechBook itemp in listBook)
                        {
                            itemp.display();
                        }
                        break;
                    case 4:
                        Console.Write("Nhap ten sach can tim: ");
                        string search = Console.ReadLine();
                        foreach (AptechBook item in listBook)
                        {
                            if (search.Equals(item.BookName))
                            {
                                item.display();
                            } else
                            {
                                Console.WriteLine("Khong tim thay {0}", search);
                                break;
                            }
                        }
                            
                        break;
                    case 5:
                        Console.Write("Nhap ten tac gia can tim: ");
                        string search1 = Console.ReadLine();
                        foreach (AptechBook item in listBook)
                        {
                            if (search1.Equals(item.BookAuthor))
                            {
                                item.display();
                            }
                            else
                            {
                                Console.WriteLine("Khong tim thay tac gia {0}", search1);
                                break;
                            }
                        }
                        break;
                    case 6:
                        // Chua lam duoc
                        break;
                    case 7:
                        // Chua lam duoc
                        break;
                    case 8:
                        Console.WriteLine("Thoat!!!!");
                        break;
                    default:
                        Console.WriteLine("Chon sai!!! Moi chon lai");
                        break;
                }

            } while (chosse != 8);
            Console.ReadKey();
        }

        public static void showMenu()
        {
            Console.WriteLine("\t\t MENU");
            Console.WriteLine("1.    Nhập thông tin n cuốn sách của Aptech");
            Console.WriteLine("2.    Hiển thị thông tin vừa nhập");
            Console.WriteLine("3.    Sắp xếp thông tin giảm dần theo năm xuất bản và hiển thị");
            Console.WriteLine("4.    Tìm kiếm theo tên sách");
            Console.WriteLine("5.    Tìm kiếm theo tên tác giả");
            Console.WriteLine("6.    Lưu thông tin sách đã nhập vào file");
            Console.WriteLine("7.    Đọc nội dung từ file và lưu vào mang quản lý sách");
            Console.WriteLine("8.    Thoát.");
        }
    }
}