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详细解读ASP.NET的异步

作者：用户投稿来源：网络发布时间： 13/01/05

这里，我们实现了一个简单的AsyncResult，由于ASP.NET通过回调方法获取异步完成，不会等待异步，所以不需要WaitHandle。在开始请求时，建立一个AsyncResult后直接返回，当异步完成时，调用AsyncResult的SetComplete方法，调用回调方法，再由 ASP.NET调用异步结束。此时整个请求即完成。

当我们访问这个地址，可以得到类似于下面的结果：

App:11240144 Begin:37:24,2676 ThreadId:6 End:37:29,2619 ThreadId:6

可以看到开始和结束在同一个线程中运行。

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当有多个并发请求时，线程池将忙碌起来，开始与结束处理也奖有机会运行于不同的线程上。50个请求并发时的处理数据：

App:52307948    Begin:39:47,8128        ThreadId:6      End:39:52,8231  ThreadId:5  
App:58766839    Begin:39:47,8358        ThreadId:5      End:39:52,8321  ThreadId:7  
App:23825510    Begin:39:47,8348        ThreadId:5      End:39:52,8321  ThreadId:7  
App:30480920    Begin:39:47,8348        ThreadId:5      End:39:52,8321  ThreadId:7  
App:62301924    Begin:39:47,8348        ThreadId:6      End:39:52,8321  ThreadId:6  
App:28062782    Begin:39:47,8338        ThreadId:5      End:39:52,8321  ThreadId:6  
App:41488021    Begin:39:47,8338        ThreadId:6      End:39:52,8321  ThreadId:7  
App:15315213    Begin:39:47,8338        ThreadId:6      End:39:52,8321  ThreadId:6  
App:17228638    Begin:39:47,8328        ThreadId:5      End:39:52,8321  ThreadId:7  
App:51438283    Begin:39:47,8328        ThreadId:6      End:39:52,8321  ThreadId:6  
App:32901400    Begin:39:47,8328        ThreadId:5      End:39:52,8321  ThreadId:7  
App:61925337    Begin:39:47,8358        ThreadId:6      End:39:52,8321  ThreadId:6  
App:24914721    Begin:39:47,8318        ThreadId:6      End:39:52,8321  ThreadId:6  
App:26314214    Begin:39:47,8318        ThreadId:6      End:39:52,8321  ThreadId:6  
App:51004322    Begin:39:47,8358        ThreadId:6      End:39:52,8321  ThreadId:6  
App:51484875    Begin:39:47,8308        ThreadId:5      End:39:52,8321  ThreadId:7  
App:19420176    Begin:39:47,8308        ThreadId:6      End:39:52,8321  ThreadId:6  
App:16868352    Begin:39:47,8298        ThreadId:6      End:39:52,8321  ThreadId:7  
App:61115195    Begin:39:47,8298        ThreadId:5      End:39:52,8321  ThreadId:6  
App:63062333    Begin:39:47,8288        ThreadId:6      End:39:52,8321  ThreadId:6  
App:53447344    Begin:39:47,8298        ThreadId:5      End:39:52,8321  ThreadId:7  
App:31665793    Begin:39:47,8288        ThreadId:5      End:39:52,8321  ThreadId:7  
App:2174563     Begin:39:47,8288        ThreadId:6      End:39:52,8321  ThreadId:6  
App:12053474    Begin:39:47,8318        ThreadId:5      End:39:52,8321  ThreadId:7  
App:41728762    Begin:39:47,8278        ThreadId:6      End:39:52,8321  ThreadId:6  
App:6385742     Begin:39:47,8278        ThreadId:5      End:39:52,8321  ThreadId:7  
App:13009416    Begin:39:47,8268        ThreadId:6      End:39:52,8321  ThreadId:6  
App:43205102    Begin:39:47,8268        ThreadId:5      End:39:52,8321  ThreadId:7  
App:14333193    Begin:39:47,8268        ThreadId:6      End:39:52,8321  ThreadId:6  
App:2808346     Begin:39:47,8258        ThreadId:6      End:39:52,8321  ThreadId:6  
App:37489757    Begin:39:47,8128        ThreadId:5      End:39:52,8231  ThreadId:6  
App:34106743    Begin:39:47,8258        ThreadId:5      End:39:52,8321  ThreadId:7  
App:30180123    Begin:39:47,8248        ThreadId:6      End:39:52,8321  ThreadId:6  
App:44313942    Begin:39:47,8248        ThreadId:5      End:39:52,8321  ThreadId:7  
App:12611187    Begin:39:47,8248        ThreadId:6      End:39:52,8321  ThreadId:6  
App:7141266     Begin:39:47,8238        ThreadId:5      End:39:52,8321  ThreadId:7  
App:25425822    Begin:39:47,8278        ThreadId:5      End:39:52,8321  ThreadId:7  
App:51288387    Begin:39:47,8238        ThreadId:5      End:39:52,8321  ThreadId:7  
App:66166301    Begin:39:47,8228        ThreadId:6      End:39:52,8321  ThreadId:6  
App:34678979    Begin:39:47,8228        ThreadId:6      End:39:52,8321  ThreadId:7  
App:10104599    Begin:39:47,8218        ThreadId:5      End:39:52,8321  ThreadId:6  
App:47362231    Begin:39:47,8258        ThreadId:5      End:39:52,8321  ThreadId:7  
App:40535505    Begin:39:47,8218        ThreadId:6      End:39:52,8321  ThreadId:7  
App:20726372    Begin:39:47,8368        ThreadId:5      End:39:52,8321  ThreadId:5  
App:2730334     Begin:39:47,8368        ThreadId:6      End:39:52,8321  ThreadId:6  
App:59884855    Begin:39:47,8368        ThreadId:5      End:39:52,8321  ThreadId:7  
App:39774547    Begin:39:47,8238        ThreadId:6      End:39:52,8321  ThreadId:6  
App:12070837    Begin:39:47,8378        ThreadId:6      End:39:52,8491  ThreadId:7  
App:64828693    Begin:39:47,8218        ThreadId:5      End:39:52,8331  ThreadId:6  
App:14509978    Begin:39:47,9308        ThreadId:6      End:39:52,9281  ThreadId:5