挂起事件处理程序的这两种语法有什么区别？ [英] What is the difference between these two syntaxes for hooking up an event handler?

问题描述

可能重复：

在C＃中附加事件处理程序的两种不同的方法有实际的区别吗？

$ b我已经看到很多代码如下：

  foo.Drop + = new DragEventHandler（fooHandler）; 
  

但是过去，我一直这样做：

  foo.Drop + = fooHandler; 
  

这两种语法有区别吗？如果是这样，那么长期的做法有什么好处吗？

解决方案

第二个是第一个的缩写;他们将编译为indentical IL。

但是，第二种语法是C＃2.0的新功能; C＃1只支持第一个。

Possible Duplicate:
Is there an actual difference in the 2 different ways of attaching event handlers in C#?

I've been seeing a lot of code that looks like this:

foo.Drop += new DragEventHandler(fooHandler);

But in the past, I've always done this:

foo.Drop += fooHandler;

Is there a difference between these two syntaxes? If so, is there any advantage to doing it the long way?

解决方案

The second is shorthand for the first; they will compile to indentical IL.

However, the second syntax is new to C# 2.0; C# 1 only supports the first.

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