C#中的委托实现

using System;

namespace MSPress.DelegateSample
{
 public delegate void PrintCallback(int number);  //定义一个名为PrintCallback的委托,返回void类型

 public class Printer
 {
  private PrintCallback _print;

  public PrintCallback PrintCallback
  {
   get
   {
    return _print;
   }
   set
   {
    _print = value;
   }
  }
 }

 public class Driver
 {
  private void PrintInteger(int number)
  {
   Console.WriteLine("From PrintInteger:The number is {0}.",number);
  }

  static void Main(string [] args)
  {
   Driver driver = new Driver();
   Printer printer = new Printer();
   printer.PrintCallback = new PrintCallback(driver.PrintInteger);//将委托绑定到PrintInteger方法
   printer.PrintCallback(10);
   printer.PrintCallback(100);
   Console.WriteLine("Press Enter to exit...");

   Console.ReadLine();
  }
 }
}