C graphical tutorial (Fourth Edition)_ Chapter 13 entrustment: what is entrustment? P238

using System;
delegate void MyDel(int value);// Declared a delegate  , The return value is void, The accepted parameter is int
                               // namely ： This delegate can represent such a function ： no return value , And accept a parameter of type int Parameters of 

namespace Chapter13Delegate_131WhatisaDelegate
{
    class Program
    {
        void PrintLow(int value)// The return value is void  The parameter is one int  Function of type 
        {
            Console.WriteLine("{0}-Low Value",value);
        }
        void PrintHigh(int value)// The return value is void  The parameter is one int  Another function of type 
        {
            Console.WriteLine("{0}-High Value", value);
        }
        static void Main(string[] args)
        {
            Program program = new Program();
            MyDel del;

            // Random number generation   0-----99
            Random rand = new Random();
            int randomValue = rand.Next(99);
            // Create a containing PrintLow or PrintHigh And assign it to del Variable 
            del = randomValue < 50 ? new MyDel(program.PrintLow) : new MyDel(program.PrintHigh);
            // The above is to assign a delegate to a function , Or to whom this Commission is given ？ Which function is given is determined , But it doesn't call 
            del(randomValue);// Perform entrusted 
            // The above statement is the real use of this delegate   Add this   Random values to run this delegate , It runs the function represented by the delegate .

            Console.WriteLine("Hello World!");
        }
    }
}