DelegateSample

DelegateSample.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DelegateSample
{
    class Program
    {

        static int TotalSum = 0;

        //  pointer to contains many function of same pointer
        public delegate void MultiFunction(int i);

        // apply delegate that to same input
        public static void ApplyMultiFunction(MultiFunction function)
        {
            // Here I don't know the name of function I liked with delegate MultiFunction
            function.Invoke(3); 
        }

        // function 1 associated with delegate
        public static void DelegateFunctionWithSameParameters(int i)
        {
            TotalSum += i;
        }

        // function 2 associated with delegate
        public static void DelegateFunctionWithSameParameters2(int i)
        {
            TotalSum *= i;
        }

        static void Main(string[] args)
        {
            MultiFunction func;   // delegate

            func = DelegateFunctionWithSameParameters;  // func1

            func += DelegateFunctionWithSameParameters2; // func2

            
            ApplyMultiFunction(func);  // apply func1 and 2

            Console.WriteLine(TotalSum); // print answer
            // must print 9 in my mind
            Console.ReadKey(); // wait for exit
        }
    }
}