作者：Chris Sells
译者：荣耀
【译注：C#进阶文章。Chris Sells是《ATL Internals》一书作者之一。译文中所有程
序调试环境均为Microsoft Visual Studio.NET 7.0 Beta2和 Microsoft .NET Framewo
rk SDK Beta2。代码就是文章，请仔细阅读代码J】
取得所有结果
     现在，peter终于松了一口气。他已经设法满足了所有的监听者，而且不会和特定
实现紧密耦合。然而，他又注意到尽管boss和universe都为工作打了分，但他只得到了
一个打分。【译注：请参见上节例子代码及译注】他希望能得到每一个监听者的评分结
果。因此，他决定提取委托调用列表，以便手工分别调用它们：
public void DoWork()
{
//...
Console.WriteLine("Worker: work completed");
     if( completed != null)
{
foreach( WorkCompleted wc in completed.GetInvocationList())
{
int grade = wc();
Console.WriteLine("Worker grade= " + grade);
}
}
}
【译注：以下是本节描述之完整代码示例：
using System;
delegate void WorkStarted();
delegate void WorkProgressing();
delegate int WorkCompleted();
class Worker
{
     public void DoWork()
     {
          Console.WriteLine("Worker: work started");
          if( started != null ) started();
          Console.WriteLine("Worker: work progressing");
          if( progressing != null ) progressing();
          Console.WriteLine("Worker: work completed");
        if( completed != null)
        {
            foreach( WorkCompleted wc in completed.GetInvocationList())
            {
                int grade = wc();
                Console.WriteLine("Worker grade= " + grade);
            }
        }
     }
     public event WorkStarted started ;
     public event WorkProgressing progressing;
     public event WorkCompleted completed;
}
class Boss
{
     public int WorkCompleted()
     {
          Console.WriteLine("Better...");
         return 4; /* out of 10 */
     }
}
class Universe
{
     static void WorkerStartedWork()
     {
          Console.WriteLine("Universe notices worker starting work");
     }
     static int WorkerCompletedWork()
     {
          Console.WriteLine("Universe pleased with worker's work");
         return 7;
     }
     static void Main()
     {
         Worker peter = new Worker()