What are Multicast delegate, type and use?
The multicast delegate is hold the references of more than one methods within the delegate object using the (+=) operator.
1.
Delegate is added using the (+=) operator.
2.
Delegate is removed using the (-=) operator.
Example for Multicast Delegate as following,
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace MulticastDelegateExample
{
public delegate int MulticastDelegateName(int num1, int num2);
public class MulticastClass
{
public static int Add(int num1, int num2)
{
return num1 + num2;
}
public static int Sub(int num1, int num2)
{
return num1 - num2;
}
static void Main(string[] args)
{
//Create the Add Delegate Instance
MulticastDelegateName objDelegt = new MulticastDelegateName(Add);
Console.WriteLine("Please enter numbers!");
int num1 = Int32.Parse(Console.ReadLine());
int num2 = Int32.Parse(Console.ReadLine());
int AddRest =
objDelegt(num1, num2);
Console.WriteLine("Result :" + AddRest);
//Create the Sub Delegate Instance
objDelegt += new MulticastDelegateName(Sub);
int subRest =
objDelegt(num1, num2);
Console.WriteLine("Result :" + subRest);
Console.ReadLine();
}
}
}
The Output
as given below,
Please
enter numbers!
num1
= 20
num2
= 10
Results:
Add: 30 and Sub: 10
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