C＃：SomeEvent + = Method和SomeEvent + = new Delegate（Method）之间有什么区别？ [英] C#: what's the difference between SomeEvent += Method and SomeEvent += new Delegate(Method)

问题描述

可能重复：

我应该创建一个新的代理实例吗？

我已经尝试搜索这个答案，但是真的不知道要搜索什么字词，而且没有一个网站提出的问题是相关的。我确定这一定已经被解决了。

Hi, I've tried searching for the answer to this, but don't really know what terms to search for, and none of the site-suggested questions are relevant. I'm sure this must have been answered before though.

基本上，有人可以告诉我这两行在C＃中有什么区别：

Basically, can somebody tell me what's the difference between these two lines in C#:

SomeEvent += SomeMethod
SomeEvent += new SomeDelegate(SomeMethod)

例如：

DataContextChanged += App_DataContextChanged;
DataContextChanged += new DependencyPropertyChangedEventHandler(App_DataContextChanged);

他们似乎都做同样的事情。

They both seem to do the same thing.

推荐答案

他们是一样的。第二个变体只是第一个调用方法组转换的简写。

They are the same. The second variant is just a shorthand for the first called Method group conversion.

简而言之，编译器推测什么代理的类型是使用事件本身的委托类型。如果没有错误的话，这是在C＃2.0中引入的。

Simply put, the compiler infers what the type of the delegate is by using the delegate type of the event itself. This was introduced in C#2.0 if I'm not mistaken.

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