C# 設定代理

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1.檢查代理是否可用：

  /// <summary>        ///  驗證代理IP地址是否可用       /// </summary>       /// <param name="callback">是否可用</param>       /// <param name="ip">地址</param>       /// <param name="port">連接埠</param>       public void ChecKedForIP(Action<bool> callback,string ip,int port,int timeout=0)       {           try           {               string Reshtml = string.Empty;//請求返回的結果               WebProxy webproxy = new WebProxy(ip, port);  //執行個體代理設定               HttpWebRequest Httpweq = (HttpWebRequest)WebRequest.Create("http://www.baidu.com");               Httpweq.Proxy = webproxy;//類比設定代理請求               HttpWebResponse HttpRespon = (HttpWebResponse)Httpweq.GetResponse();               Httpweq.Timeout = timeout != 0 ? timeout : 10000; //預設10秒，如果設定值，就用設定的值               Encoding encoding = Encoding.GetEncoding("gb2312");//設定編碼格式為漢字，防止英文系統，無法解碼               using (StreamReader reader = new StreamReader(HttpRespon.GetResponseStream(), encoding))               {                   Reshtml = reader.ReadToEnd().Trim();                   if (!string.IsNullOrEmpty(Reshtml))                   {                       callback(true);                   }                   else                   {                       callback(false);                   }               }           }           catch (Exception)           {               callback(false);           }           finally { }                  }

 2.設定好修復代理設定

[DllImport(@"wininet",SetLastError = true,CharSet = CharSet.Auto,EntryPoint = "InternetSetOption",CallingConvention = CallingConvention.StdCall)]       public static extern bool InternetSetOption       (       int hInternet,       int dmOption,       IntPtr lpBuffer,       int dwBufferLength       );       /// <summary>       /// 設定代理       /// </summary>       /// <param name="ip_port">IP地址和連接埠</param>       public void SetProxy(string ip_port)       {           //開啟註冊表           RegistryKey regKey = Registry.CurrentUser;           string SubKeyPath = @"Software\Microsoft\Windows\CurrentVersion\Internet Settings";           RegistryKey optionKey = regKey.OpenSubKey(SubKeyPath, true);           //更改健值，設定代理，           optionKey.SetValue("ProxyEnable", 1);           if (ip_port.Length == 0)           {               optionKey.SetValue("ProxyEnable", 0);           }           optionKey.SetValue("ProxyServer", ip_port);           //啟用代理設定           InternetSetOption(0, 39, IntPtr.Zero, 0);           InternetSetOption(0, 37, IntPtr.Zero, 0);       }       /// <summary>       /// 不使用代理設定       /// </summary>       public void UnSetProxy()       {           RegistryKey regKey = Registry.CurrentUser;           string SubKeyPath = @"Software\Microsoft\Windows\CurrentVersion\Internet Settings";           RegistryKey optionKey = regKey.OpenSubKey(SubKeyPath, true);           //更改健值，設定代理，           optionKey.SetValue("ProxyEnable", 0);           //啟用代理設定           InternetSetOption(0, 39, IntPtr.Zero, 0);           InternetSetOption(0, 37, IntPtr.Zero, 0);       }