WebClient 不支持并发 I/O 操作

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System.NotSupportedException: WebClient 不支持并发 I/O 操作。
在 System.Net.WebClient.ClearWebClientState()
在 System.Net.WebClient.DownloadFileAsync(Uri address, String fileName, Object userToken)
在 Readpaper.WebClientDownfile.Downbkfile(String webfile, String& datafile) 位置 E:\aspnet2.0\WebClientDownfile.cs:行号 91

解决：创建多个类

WebClientDownfile wd5 = new WebClientDownfile();
Thread thread5 = new Thread(new ThreadStart(() => wd5.Downbkfile(f5, out d1)));
thread5.Start();
thread5.Join();
thread5.Abort(); //线程启动马上关闭

WebClientDownfile wd6 = new WebClientDownfile();

如：System.Net.WebClient myWebClient1= new System.Net.WebClient();
System.Net.WebClient myWebClient2 = new System.Net.WebClient();

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