Which code should I choose to call a delegate method?

To handle an event, I use the code as below:

obj.Evt += new EvtEventHandler(DoEvt);

or

obj.Evt += DoEvt;

will make sam开发者_运维问答e result;

So... Please tell me which one I should choose! And why?

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Assuming that Evt is typed as EvtEventHandler then there is no difference (unless you use C# 1.2, where only the first exists).

Use whichever you want.

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It doesn't matter. Behind the scenes, both ways are the same (the compiler generates the same code). See "13.6 Method group conversions" in the ECMA C# specification (you can read it here).

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Yes they make the same result. however if you are using 1.0 or 1.1 you must specify EvtEventHandler, for later versions 2.0 and above you can get rid from it.

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For IL, they are the same,

  IL_0020:  newobj     instance void [mscorlib]System.EventHandler::.ctor(object,
                                                                     native int)
  IL_0025:  callvirt   instance void ConsoleApplication15.A::DoEvt(class [mscorlib]System.EventHandler)

But I think the first one is meaningful for maintaining your code.