异步调用Web服务，执行WaitAll出错

[Jelon]

在vs.net2003中运行以下代码：

localhost2.SleepService1 cServiceA=new Chapter19CSharpClient.localhost2.SleepService1();

localhost.SleepService2 cServiceB=new Chapter19CSharpClient.localhost.SleepService2();

IAsyncResult arA=cServiceA.BeginSleepServiceA(100,null,null);
IAsyncResult arB=cServiceB.BeginSleepServiceB(1000,null,null);

WaitHandle[] wh={arA.AsyncWaitHandle,arB.AsyncWaitHandle};
//WaitHandle[] wh={arB.AsyncWaitHandle};
WaitHandle.WaitAll(wh);

txtResult.Text=cServiceA.EndSleepServiceA(arA);
txtResult.Text+="\r\n"+cServiceB.EndSleepServiceB(arB);

执行到WaitHandle.WaitAll(wh);时出错，出错信息：
未处理的“System.NotSupportedException”类型的异常出现在 mscorlib.dll 中。
其他信息: 不支持一个 STA 线程上多个句柄的 WaitAll。

而将WaitHandle[] wh={arA.AsyncWaitHandle,arB.AsyncWaitHandle};
替换为WaitHandle[] wh={arA.AsyncWaitHandle};或WaitHandle[] wh={arB.AsyncWaitHandle};时，均可正常运行。

请各位高手指教！！！

[孟子E章]

服务器端异步 Web 方法

http://www.microsoft.com/china/msdn/library/dnservice/html/service10012002.asp

[孟子E章]

http://www.google.com/search?hl=zh-CN&ie=UTF-8&oe=UTF-8&q=%E5%BC%82%E6%AD%A5%E8%B0%83%E7%94%A8+Web%E6%9C%8D%E5%8A%A1&btnG=Google%E6%90%9C%E7%B4%A2&lr=

[saucer]

find the following attribute in your code and remove it
[STAThread]

[Jelon]

to saucer:
我注释[STAThread]后，仍出现相同的错误。请再帮我想想解决办法，谢谢！

[saucer]

oh, boy, try to change it to [MTAThread], :-)

[Jelon]

感谢saucer，我晚上再试试！

[Jelon]

to saucer:
真不好意思，犯了如此低级的错误。
感谢你的帮助，现在程序已正常运行。高手就是高手！！！