1 using System;
 2 using System.Threading;
 3  public class ThreadReturnData
 4     {
 5         public ManualResetEvent manual;
 6         public string res;
 7 
 8         public void ReturnThreadData(object obj)
 9         {
10             //线程耗时操作方法
11             res = DoSomething(obj);
12              manual.Set();
13         }
14     }

 1  List<ThreadReturnData> testList = new List<ThreadReturnData>();
 2 IList<ManualResetEvent> arrManual = new List<ManualResetEvent>();
 3 for (int i = 0; i < i; i++)
 4                     {
 5                             ThreadReturnData temp = new ThreadReturnData();
 6                             temp.manual = new ManualResetEvent(false);
 7                             arrManual.Add(temp.manual);
 8                             ThreadPool.QueueUserWorkItem(new WaitCallback(temp.ReturnThreadData), i);
 9                             testList.Add(temp);
10                         }
11                     }
12                     if (arrManual.Count > 0)
13                     {
14                         ////等待所有线程执行完
15                         WaitHandle.WaitAll(arrManual.ToArray());
16                     }
17  foreach (ThreadReturnData d in testList)       
18  {
19 d.res;
20 //todo
21 }