如何理解C#代表? [英] How to understand C# delegates?

问题描述

请考虑以下示例:

Consider the example below:

private void button1_Click(object sender, EventArgs e)
   {
     DelegateSample obj = new DelegateSample();
     DelFunc delobj1 = new DelFunc(obj.func1);
     delobj1 += new DelFunc(obj.func2);
     delobj1 += new DelFunc(obj.func3);
     obj.functionAll(delobj1);
   }
 }
 class DelegateSample
 {
   public void func1()
   {
     MessageBox.Show("You just called func1");
   }
   public void func2()
   {
     MessageBox.Show("You just called func2");
   }
   public void func3()
   {
     MessageBox.Show("You just called func3");
   }
   public void functionAll(Delegate o)
   {
   Delegate[] objdel= o.GetInvocationList();
   for (int i = 0; i < objdel.Length; i++)
   {
     DelFunc obj = (DelFunc)objdel[i];
     obj.Invoke();
   }
   }

在这里，我有一个引用3个方法的委托对象.我添加了方法引用，并且将委托对象作为参数传递给方法.单击按钮时调用此方法，因此我想知道如何当我已经在编译时添加了所有3个方法的引用时，将在运行时"期间调用这些方法.

Here i have a delegate object which references 3 methods.I have added the method references and the delegate object is being passed as an argument to a method.This method is called when the buttom is clicked.Hence I''d like to know how these methods are called during "RUNTIME" when I have already added the references of all the 3 methods in the compile time.

推荐答案

好，您的代码很复杂.你为什么要这样?您想知道什么?您的代码有效吗，您想知道它如何起作用?该方法之所以被称为是因为您已经获得了对它们的引用，所以它知道要调用什么.

Well, your code is convoluted. Why are you dong this ? What is it you want to know ? Does your code work and you want to know HOW it works ? The methods get called BECAUSE you''ve got references to them, so it knows what to call.

C#-委托101-实际示例 [ ^ ]
http://msdn.microsoft.com/en-us/library/aa288459％28v = vs.71％29.aspx [ ^ ]
http://www.dotnetscraps.com/dotnetscraps/post/Explaining-Delegates-in- C.aspx [ ^ ]

以上链接可以帮助您理解.

C# - Delegates 101 - A Practical Example[^]
http://msdn.microsoft.com/en-us/library/aa288459%28v=vs.71%29.aspx[^]
http://www.dotnetscraps.com/dotnetscraps/post/Explaining-Delegates-in-C.aspx[^]

Above links may help you to understand.

您需要阅读有关C#委托的内容，请从以下链接开始:

了解C#中的代理 [ http://www.c-sharpcorner.com/UploadFile/Ashush/Delegates02152008155757PM/Delegates.aspx [ ^ ]

http://msdn.microsoft.com/en-us/library/aa288459％28v = vs.71％29.aspx [ ^ ]

C尖代表 [

You need to read stuffs on C# delegates, start with these links:

Understanding Delegates in C#[^]

http://www.c-sharpcorner.com/UploadFile/Ashush/Delegates02152008155757PM/Delegates.aspx[^]

http://msdn.microsoft.com/en-us/library/aa288459%28v=vs.71%29.aspx[^]

C-sharp Delegates[^]

hope it helps :)

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