webclient问题

john51200 2011-12-30 04:28:19

使用线程池来多线程调用webclient，使用异步方式调用，当线程池最大线程数为3时可以得到响应数据，当最大线程数大于3时则无法获得响应数据。
主要代码如下：
public void getPage(string url)
{
Uri uri = new Uri(url);
WebClient wc = new WebClient();
wc.Headers.Add("Accept", "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");
wc.Headers.Add("Accept-Language", "zh-cn");
wc.Headers.Add("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)");
wc.Headers.Add("Cookie", strCookie);
wc.DownloadDataCompleted += new DownloadDataCompletedEventHandler(wc_DownloadDataCompleted);
wc.DownloadDataAsync(uri);
}
void wc_DownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e)
{
//对响应结果的处理
}
每一个线程都会多次调用getPage函数

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