public string Getms(string url = "https://www.baidu.com/", string proxy = null)

         {

             Stopwatch sw = new Stopwatch();

             try

             {

                 HttpHelpers helper = new HttpHelpers();

                 HttpItems items = new HttpItems();

                 HttpResults hr = new HttpResults();

                 items.URL = url;

                 items.ResultType = ResultType.So;

                 items.ProxyIp = proxy;

                 sw.Start();

                 hr = helper.GetHtml(items);

                 sw.Stop();

                 if (hr.StatusCode == HttpStatusCode.OK)

                 {

                     return sw.ElapsedMilliseconds.ToString();

                 }

                 return "-1";

             }

             catch (Exception)

             {

                 return "-500";

             }

         }

 //打开注册表键

             Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Internet Settings", true);

             int count = ;

             while (rk.GetValue("ProxyServer") == null && count != )

             {

                 count = count - ;

                 //设置代理IP和端口

                 rk.SetValue("ProxyEnable", );

                 rk.SetValue("ProxyServer", ip + ":" + port);

             }

             API.InternetSetOptionA(, , , );