What is Multicast Delegate? Explain it with example in C#?

Delegates are used to wrap and execute methods having the same signature as that of the delegate. They wrap method calls and prevent exposing the actual method name to the User.

Delegates have a very special feature which supports execution of multiple methods using a single delegate call. This is known as multicast delegate.

For a delegate you can define an invocation list and while calling the delegate, all the methods in its invocation list will be executed. You can add methods to the invocation list using += operator. You can also remove methods from the list using -= operator. The following example demonstrates usage of multicast delegate in C# by creating a delegate and executing two different methods using the same delegate:

public delegate void sampleDelegate(int data);
public class testDelegate {
public void checkEven(int data) {
if(data%2 ==0) {
Console.WriteLine(“This number is an even number”);
}
}
public void squareNumber(int data) {
Console.WriteLine(“Square of this number is: {0}”, data*data);
}
}
class testClass {
public static void Main( ) {
testDelegate obj = new testDelegate();
sampleDelegate delegateObj = new sampleDelegate(obj.checkEven);
delegateObj += new sampleDelegate(obj.squareNumber);
delegateObj(20);
}
}

Output of this code will be:

This number is an even number
Square of this number is: 400

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