C# new [delegate] not necessary?

Question

I\'ve been playing with HttpWebRequests lately, and in the tutorials they always do:

IAsyncResult result = request.BeginGetResponse(
  new Async         


        

Answer 1

AsyncCallback is just a delegate in C#, it is declared as

public delegate void AsyncCallback(IAsyncResult ar);

When you pass the method name itself as long as the signature matches the compiler will usually substitute the code for you, its just shortcut.

You can simply check this using Reflector. If you have this for example.

request.BeginGetResponse(TestMethod, null);

 static void (IAsyncResult r)
        {
           //do something
        }

The compiled code will actually look like this.

   request.BeginGetResponse(new AsyncCallback(Test), null);