Question

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

tmrMain.Elapsed += new ElapsedEventH以及ler(tmrMain_Tick);

以及

tmrMain.Elapsed += tmrMain_Tick;

两者似乎完全相同。页: 1 C# 只是假设你在什么时候把后者归类?

Answer 1

我这样做了。

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

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

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

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

Answer 2

It used to be (.NET 1.x days) that the long form was the only way to do it. In both cases you are newing up a delegate to point to the Program_someEvent method.

Answer 3

I don t think there s any difference. Certainly resharper says the first line has redundant code.

Answer 4

略微脱色:

You could instantiate a delegate (new EventHandler(MethodName)) and (if appropriate) reuse that instance.

Answer 5

是否需要在C#2003之前加入new XYZEventHandler,并且允许你在C#2005中删除多余的代码?

Answer 6

我认为,真正讲解的一个办法是看一下为法典编制的联塞综合办。帐篷是一种良好的酸试验。

我担心,它可能在某种程度上与GC。奇怪的是,如果永远不需要这样做,那么宣布新代表类别的所有间接费用都会发生吗?

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