与无＆QUOT布线事件之间的区别;新＆QUOT; [英] Difference between wiring events with and without "new"

问题描述

在C＃，code的这两条线之间的差值（如果有的话）是什么？

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;

两者出现的工作完全一样。请问C＃只是假设你指的是前者，当你键入后者？

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

推荐答案

我这样做

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

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

然后跑去ILDASM在code。

所产生的MSIL是完全一样的。

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

因此​​，要回答你的问题，是的，他们是同一个东西。

编译器只是推断要 someEvent + =新的EventHandler（Program_someEvent）;

- 你可以看到它在MSIL这两种情况下创建新的事件处理程序对象

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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