.Net Framework 中设置Web Proxy 的方法

WebProxy proxy = new WebProxy("proxy address", port);
proxy.Credentials = new NetworkCredential("user name", "password ", "domain");
WebRequest.DefaultWebProxy = proxy;

WebProxy webProxy = new WebProxy("proxy url", 8080);
NetworkCredential networkCredential
 = new NetworkCredential("user name", "password", "domain");
webProxy.Credentials = networkCredential;
GlobalProxySelection.Select = webProxy;