有和没有“新"的接线事件之间的区别

问题描述

在 C# 中，这两行代码有什么区别(如果有的话)?

In C#, what is the difference (if any) between these two lines of code?

tmrMain.Elapsed += new ElapsedEventHandler(tmrMain_Tick);

和

tmrMain.Elapsed += tmrMain_Tick;

两者的工作方式似乎完全相同.当您键入后者时，C# 是否只是假设您指的是前者?

Both appear to work exactly the same. Does C# just assume you mean the former when you type the latter?

推荐答案

我做到了

static void Hook1()
{
    someEvent += new EventHandler( Program_someEvent );
}

static void Hook2()
{
    someEvent += Program_someEvent;
}

然后在代码上运行 ildasm.
生成的 MSIL 完全一样.

And then ran ildasm over the code.
The generated MSIL was exactly the same.

所以要回答你的问题，是的，它们是一回事.
编译器只是推断您想要 someEvent += new EventHandler( Program_someEvent );
-- 您可以在 MSIL 中看到它在两种情况下都创建了新的 EventHandler 对象

So to answer your question, yes they are the same thing.
The compiler is just inferring that you want someEvent += new EventHandler( Program_someEvent );
-- You can see it creating the new EventHandler object in both cases in the MSIL

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