委托(三)(異步調用與動態加載委托)

/*皮特的故事*/
using System;
using System.Collections.Generic;
using System.Text;

namespace Delegate
{
 public class Class1
 {
 }

 delegate void WorkStarted();
 delegate void WorkProgressing();
 delegate int WorkCompleted();

 class Worker
 {
  //申明三個代理
  //public WorkStarted wsStarted;
  //public WorkProgressing wsProgressing;
  //public WorkCompleted wsCompleted;
  //修改為事件就可以動態加載
  public event WorkStarted wsStarted;
  public event WorkProgressing wsProgressing;
  public event WorkCompleted wsCompleted;

  public void DoWork()
  {
   Console.WriteLine("工作:工作開始");
   if (wsStarted != null)
    wsStarted();

   Console.WriteLine("工作:工作進行中");
   if (wsProgressing != null)
    wsProgressing();

   Console.WriteLine("工作:工作結束!");
   Console.WriteLine("你在等待結果時候可以做自己的事!");
   if (wsCompleted != null)
   {
    //Console.WriteLine("工人工作的得分=" + wsCompleted());
    //通過輪詢監聽者來獲取所有請求,否則只能看到最後一個
    foreach (WorkCompleted wc in wsCompleted.GetInvocationList())
    {
     #region 非異步做法