By GokiSoft.com| 14:41 26/05/2021|
C Sharp

[Share Code] Tìm hiểu event + delegate + Collection - Lập trình C# 



using System;
namespace Lesson06
{
    [Serializable]
    public class ClassRoom
    {
        public string Name { get; set; }
        public string Code { get; set; }
        public ClassRoom()
        {
        }

        public ClassRoom(string name, string code)
        {
            this.Name = name;
            this.Code = code;
        }

        public void Display()
        {
            Console.WriteLine("Name: {0}, Code: {1}", Name, Code);
        }
    }
}




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

namespace Lesson06
{
    public delegate float Calculator(float x, float y);

    class MainClass
    {
        static event Calculator calEvent = null;

        public static void Main(string[] args)
        {
            List<ClassRoom> list = new List<ClassRoom>();
            list.Add(new ClassRoom("A", "A"));
            list.Add(new ClassRoom("C", "C"));
            list.Add(new ClassRoom("B", "B"));
            list.Add(new ClassRoom("E", "E"));
            list.Add(new ClassRoom("A", "A"));

            list.Sort((o1, o2) =>
            {
                return o1.Code.CompareTo(o2.Code);
            });

            foreach(ClassRoom c in list)
            {
                c.Display();
            }

            //Luu List object vao file.
            string filePath = "classroom.dat";
            using (Stream stream = File.Open(filePath, FileMode.Create))
            {
                var binaryFormatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                //foreach(ClassRoom c in list)
                //{
                //    binaryFormatter.Serialize(stream, c);
                //}
                binaryFormatter.Serialize(stream, list);
            }

            List<ClassRoom> list2 = new List<ClassRoom>();
            using (Stream stream = File.Open(filePath, FileMode.Open))
            {
                var binaryFormatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                list2 = (List<ClassRoom>)binaryFormatter.Deserialize(stream);
            }

            foreach(ClassRoom c in list2)
            {
                c.Display();
            }
        }

        static void Test()
        {
            Console.WriteLine("Hello World!");
            float x = 6.2f, y = 7.8f;
            float r1 = Add(x, y);
            float r2 = Sub(x, y);
            Console.WriteLine("r1 = {0}, r2 = {1}", r1, r2);

            //Bai 1: Tao 1 list -> Quan ly duoc cac function Add, Sub => duyet qua phan tu trong mang -> thuc thi lenh
            //Yeu cau: tat ca cac function -> cung kieu tham
            List<Calculator> list = new List<Calculator>();

            Calculator c1 = new Calculator(Add);
            //Calculator c2 = new Calculator(Sub);

            list.Add(c1);
            //list.Add(c2);
            list.Add(Sub);

            Calculator c3 = delegate (float x1, float y1) {
                return x1 * y1;
            };
            list.Add(c3);

            foreach (Calculator c in list)
            {
                Console.WriteLine("Ket qua: {0}", c(x, y));
            }

            //Chuc nang kha moi so vs Java (PHP).
            Calculator cal = Add;
            cal += Sub;
            cal += delegate (float x1, float y1) {
                Console.WriteLine("Tich: {0}", x * y);
                return x * y;
            };

            cal(x, y);

            //Gia lap event trong C#
            calEvent = Add;
            calEvent(x, y);

            //List
            ClassRoom classRoom = new ClassRoom("T2008A ABC", "T2008A");

            Hashtable hashtable = new Hashtable();
            hashtable.Add("fullname", "TRAN VAN DIEP");
            hashtable.Add("age", 32);
            hashtable.Add(classRoom.Code, classRoom);

            string name = (string)hashtable["fullname"];
            Console.WriteLine("fullname: {0}", name);

            ClassRoom cr = (ClassRoom)hashtable["T2008"];
            if (cr != null)
            {
                cr.Display();
            }

            //Nghiep vu: Xay dung chuong trinh quan ly thong tin sinh vien => tim kiem thong tin sinh vien theo rollno.
            //Hashtable quan ly du lieu => rollNo lam key => value: object sinh vien
        }

        public static float Add(float x, float y)
        {
            Console.WriteLine("Tong: {0}", x + y);
            return x + y;
        }

        public static float Sub(float x, float y)
        {
            Console.WriteLine("Hieu: {0}", x - y);
            return x - y;
        }
    }
}





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Phản hồi từ học viên

5

(Dựa trên đánh giá ngày hôm nay)

Do Trung Duc [T2008A]
Do Trung Duc

2021-05-28 15:54:16



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

namespace Lesson7.BookProject
{
    class Program
        
    {
        static List<AptechBook> BookAptechList = new List<AptechBook>();
        static void Main(string[] args)
            
        {
            int choose;
            do
            {
                Menu();

                choose = Int32.Parse(Console.ReadLine());

                switch (choose)
                {
                    case 1:
                        InputBook();
                        break;

                    case 2:
                        DisplayAllBook();
                        break;

                    case 3:
                        BookAptechList.Sort((o1, o2) =>
                        {
                            return -o1.YearPublishing.CompareTo(o2.YearPublishing);
                        });
                        foreach (AptechBook aptechbook in BookAptechList)
                        {
                            aptechbook.Display();
                        }
                        break;

                    case 4:
                        FindBookByBookName();
                        break;

                    case 5:
                        FindBookByAuthorName();
                        break;

                    case 6:
                        SaveInFile();
                        break;

                    case 7:
                        ReadFile();
                        break;

                    case 8:
                        Console.WriteLine("Thoat...");
                        break;

                }

            } while (choose!=8);
        }

        private static void ReadFile()
        {   
            using (Stream stream = File.Open("Books.dat", FileMode.Open))
            {
                var binaryFormatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                BookAptechList = (List<AptechBook>)binaryFormatter.Deserialize(stream);
            }
            Console.WriteLine("Doc file thanh cong");
        }

        private static void SaveInFile()
        {
            string filePath = "Books.dat";
            using (Stream stream = File.Open(filePath, FileMode.Create))
            {
                var binaryFormatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                //foreach(ClassRoom c in list)
                //{
                //    binaryFormatter.Serialize(stream, c);
                //}
                binaryFormatter.Serialize(stream, BookAptechList);
            }
            Console.WriteLine("Luu file thanh cong");
        }



        private static void FindBookByBookName()
        {
            Console.WriteLine("Nhap ten sach can tim:");
            string FindBookName = Console.ReadLine();
            foreach(AptechBook aptechbook in BookAptechList)
            {
                if(aptechbook.BookName == FindBookName)
                {
                    aptechbook.Display();
                }
            }
        }

        private static void FindBookByAuthorName()
        {
            Console.WriteLine("Nhap ten sach can tim:");
            string FindAuthorName = Console.ReadLine();
            foreach (AptechBook aptechbook in BookAptechList)
            {
                if (aptechbook.BookAuthor == FindAuthorName)
                {
                    aptechbook.Display();
                }
            }
        }

        private static void InputBook()
        {
            Console.WriteLine("Nhap so luong cuon sach muon nhap:");
            int N= Int32.Parse(Console.ReadLine());
            for(int i =0 ; i < N; i++)
            {
                AptechBook aptechbook = new AptechBook();
                aptechbook.Input();
                BookAptechList.Add(aptechbook);
            }

        }

        private static void DisplayAllBook()
        {
            for(int i = 0 ; i < BookAptechList.Count ; i++)
            {
                BookAptechList[i].Display();
            }

        }

        public 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. Thoat");
            Console.WriteLine("Chon: ");
        }
    }
}