C＃：SomeEvent + = Method和SomeEvent + = new Delegate（Method）之间有什么区别？

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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，这在C＃2.0中引入。

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.