1         #region 代理
 2 
 3         private static WebProxy _webproxy = null;
 4 
 5         /// <summary>
 6         /// 设置Web代理
 7         /// </summary>
 8         /// <param name="host"></param>
 9         /// <param name="port"></param>
10         /// <param name="username"></param>
11         /// <param name="password"></param>
12         public static void SetHttpProxy(string host, string port, string username, string password)
13         {
14             ICredentials cred;
15             cred = new NetworkCredential(username, password);
16             if (!string.IsNullOrEmpty(host))
17             {
18                 _webproxy = new WebProxy(host + ":" + port ?? "80", true, null, cred);
19             }
20         }
21 
22         /// <summary>
23         /// 清除Web代理状态
24         /// </summary>
25         public static void RemoveHttpProxy()
26         {
27             _webproxy = null;
28         }
29 
30         #endregion

//设置
RequestUtility.SetHttpProxy("http://192.168.1.130","8088","username","pwd");

//清除
RequestUtility.RemoveHttpProxy();