访问“自我” 闭包中的对象

发布于 2024-07-26 21:35:57 字数 429 浏览 3 评论 0原文

我遇到以下问题：（c#）

有一些类（IRC bot），它有方法，需要某些事件的结果才能完成（通过它可以是异步的）。

也许不清楚：

// simplified
class IRC 
{
 void DoSomeCommand()
 {
  OnListOfPeopleEvent += new Delegate(EventData e) { 
   if (e.IsForMe)
   {
    ReturnToUserSomeData();
    // THIS IS WHAT I NEED
    OnListOfPeopleEvent -= THIS DELEGATE;
   }
  }
  TakeListOfPeopleFromIrc();
 }
}

我想在功能完成时删除该委托。有什么方法可以获取对闭包本身的引用吗？

原文

I've got following problem: (c#)

There is some class (IRC bot), which has method, which needs result of some event for complete (through it could be asynchronous).

Maybe not clear:

// simplified
class IRC 
{
 void DoSomeCommand()
 {
  OnListOfPeopleEvent += new Delegate(EventData e) { 
   if (e.IsForMe)
   {
    ReturnToUserSomeData();
    // THIS IS WHAT I NEED
    OnListOfPeopleEvent -= THIS DELEGATE;
   }
  }
  TakeListOfPeopleFromIrc();
 }
}

And I want to delete that delegate when it the function is complete. Is there any way how to obtain the reference to closure in it itself?

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谁许谁一生繁华 2024-08-02 21:35:57

您可以使用捕获自身的 cheaky 变量来做到这一点；-p

SomeDelegateType delegateInstance = null;
delegateInstance = delegate {
    ...
    obj.SomeEvent -= delegateInstance;
};
obj.SomeEvent += delegateInstance;

第一行带有 null 需要满足明确的赋值；但您可以在匿名方法中捕获此变量。

You can do this with a cheaky variable that captures itself ;-p

SomeDelegateType delegateInstance = null;
delegateInstance = delegate {
    ...
    obj.SomeEvent -= delegateInstance;
};
obj.SomeEvent += delegateInstance;

The first line with null is required to satisfy definite assignment; but you are allowed to capture this variable inside the anon-method.

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