Simple Delegate (delegate) vs. Multicast delegates

Question

I have gone through many articles but I am still not clear about the difference between the normal delegates that we usually create and multicast delegates.

public delegate void MyMethodHandler(object sender); MyMethodHandler handler = new MyMethodHandler(Method1); handler += Method2; handler(someObject); 

The above delegate MyMethodHandler will call these two methods. Now where does multicast delegates come in. I have read that they can call multiple methods but I am afraid that my basic understanding about delegates is not correct.

Answer 1

This article explains it pretty well:

delegate void Del(string s);  class TestClass {     static void Hello(string s)     {         System.Console.WriteLine("  Hello, {0}!", s);     }      static void Goodbye(string s)     {         System.Console.WriteLine("  Goodbye, {0}!", s);     }      static void Main()     {         Del a, b, c, d;          // Create the delegate object a that references          // the method Hello:         a = Hello;          // Create the delegate object b that references          // the method Goodbye:         b = Goodbye;          // The two delegates, a and b, are composed to form c:          c = a + b;          // Remove a from the composed delegate, leaving d,          // which calls only the method Goodbye:         d = c - a;          System.Console.WriteLine("Invoking delegate a:");         a("A");         System.Console.WriteLine("Invoking delegate b:");         b("B");         System.Console.WriteLine("Invoking delegate c:");         c("C");         System.Console.WriteLine("Invoking delegate d:");         d("D");     } } /* Output: Invoking delegate a:   Hello, A! Invoking delegate b:   Goodbye, B! Invoking delegate c:   Hello, C!   Goodbye, C! Invoking delegate d:   Goodbye, D! */ 

Answer 2

The C# specification states that all delegate types must be convertible to System.Delegate. In fact the way the implementation implements this is that all delegate types are derived from System.MulticastDelegate, which in turn derives from System.Delegate.

Is that clear? I'm not sure that answered your question.