C# 中的委派 (Delegation)

委派

using System;
// Declare delegate -- defines required signature:
delegate void SampleDelegate(string message);

class MainClass
{
    // Regular method that matches signature:
    static void SampleDelegateMethod(string message)
    {
        Console.WriteLine(message);
    }

    static void Main()
    {
        // Instantiate delegate with named method:
        SampleDelegate d1 = SampleDelegateMethod;
        // Instantiate delegate with anonymous method:
        SampleDelegate d2 = delegate(string message)
        {
            Console.WriteLine(message);
        };

        // Invoke delegate d1:
        d1("Hello");
        // Invoke delegate d2:
        d2(" World");
    }
}

事件

C#物件 事件 委派 撰寫 範例

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

namespace eventSimple
{
    class Program
    {

        delegate void myFunction(string text);
        static event myFunction readKeyEvent;

        static void Main(string[] args)
        {

            readKeyEvent += new myFunction(myFunction1);
            Console.WriteLine("請輸入一字串");
            string text = Console.ReadLine();
            Console.WriteLine();

            Console.WriteLine("第一次觸發事件");
            readKeyEvent.Invoke(text);
            Console.WriteLine();

            readKeyEvent += new myFunction(myFunction2);
            Console.WriteLine("請輸入一字串");
            text = Console.ReadLine();
            Console.WriteLine();

            Console.WriteLine("第二次觸發事件");
            readKeyEvent.Invoke(text);
            Console.WriteLine();

            Console.WriteLine("按任意鍵離開");
            Console.ReadKey();

        }

        static void myFunction1(string text)
        {
            Console.WriteLine("這次第一次執行的函數");
            Console.WriteLine("參數="+text);
        }

        static void myFunction2(string text)
        {
            Console.WriteLine("這次第二次執行的函數");
            Console.WriteLine("參數=" + text);
        }

      }
}

參考文獻

C# 語言參考 - delegate (C# 參考)

page revision: 2, last edited: 01 Aug 2019 02:56

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作者：陳鍾誠

委派

事件

參考文獻

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