微信公众平台开发：Web代理功能

#region 代理

        private static WebProxy _webproxy = null;

        /// <summary>
        /// 设置Web代理
        /// </summary>
        /// <param name="host"></param>
        /// <param name="port"></param>
        /// <param name="username"></param>
        /// <param name="password"></param>
        public static void SetHttpProxy(string host, string port, string username, string password)
        {
            ICredentials cred;
            cred = new NetworkCredential(username, password);
            if (!string.IsNullOrEmpty(host))
            {
                _webproxy = new WebProxy(host + ":" + port ?? "80", true, null, cred);
            }
        }

        /// <summary>
        /// 清除Web代理状态
        /// </summary>
        public static void RemoveHttpProxy()
        {
            _webproxy = null;
        }

        #endregion

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

//清除
RequestUtility.RemoveHttpProxy();