Question

In the following code, does ptrcall point…

• to 2 places on the heap with methods obj.callMe and obj1.callMe; or…

• to 1 place that contains both methods obj.callMe, obj1.callMe within it?

  public delegate void CallEveryOne();
  
  private void Form1_Load(object sender, EventArgs e)
  {
  
  public CallEveryOne ptrcall=null;
  
  public Form2 obj = new Form2();
  public Form3 obj1 = new Form3();
  
      obj.Show();
      obj1.Show();
  
      ptrcall += obj.CallMe;
      ptrcall += obj1.CallMe;
  } 
  

Answer 1

ptrcall is, like basically all delegates from .NET 2.0 onward, a multicast delegate. That is, it keeps its own internal list of methods that it refers to. MSDN has the following to say on MulticastDelegate:

Represents a multicast delegate; that is, a delegate that can have more than one element in its invocation list. (Emphasis added by me.)

So, in your terminology, the answer is most likely that ptrcall point to 2 place on heap.

But why does this implementation detail matter at all?

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P.S.: You could call ptrcall.GetInvocationList() and see what you get back. I only recommend this to you for toying around and getting to know delegates better; don’t do it in production code unless you really have to.