一个服务器上面配置多个IP ，实现指定IP的域名请求

//配置多个IP命名
using System.Net;

//***************************************************************************

 /// <summary>

        /// 通过设置这个属性，可以在发出连接的时候绑定客户端发出连接所使用的IP地址。

        /// </summary>

        /// <param name="servicePoint"></param>

        /// <param name="remoteEndPoint"></param>

        /// <param name="retryCount"></param>

        /// <returns></returns>

        public static IPEndPoint BindIPEndPointCallback(ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount)

        {

            return new IPEndPoint(IPAddress.Parse("192.168.1.1") , );//端口号

        }

        /// <summary>

        /// 一个服务器上面配置多个IP 固定出网IP

        /// </summary>

        public static void MakeRequest()

        {

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.baidu.com");

            //设置本地的出口ip和端口

            request.ServicePoint.BindIPEndPointDelegate = new BindIPEndPoint(BindIPEndPointCallback);

            if (ServicePointManager.DefaultConnectionLimit < )

            {

                ServicePointManager.DefaultConnectionLimit = ;

            }

            //req.ServicePoint.ConnectionLimit=int.Max;  //允许最大连接数

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            response.ToString();

        }

HttpWebRequest的详细方法二：

 System.Net.HttpWebRequest myRequest = null;

            System.Net.HttpWebResponse myResponse = null;

            Stream reqStream = null;

            Stream resStream = null;

            string signkey = "", url = "";

            string sdateStr = DateTime.Now.AddDays(-).ToString("yyyyMMdd") + "";

            try

            {

                signkey = XH_ChannelKey;//key

                url = XH_ChannelUrl;    //接口地址

                url += "fromDate=" + sdateStr;

                url += "&version=1.4";//版本号

                url += "&hmac=" + MD5Encrypt(signkey + sdateStr + "1.4");

                //想服务器端发送请求，获取订单信息

                myRequest = System.Net.WebRequest.Create(url) as System.Net.HttpWebRequest;

                //--------------------- c#中HttpWebRequest使用Proxy实现指定IP的域名请求 ---------------------------------

                //需要使用Proxy和其配置 (代理ip)

                ////System.Net.WebProxy proxy = new System.Net.WebProxy("115.238.128.138", 80);

                ////myRequest.Proxy = proxy;

                //------------------------------------------------------

                myRequest.Timeout =  *  * ;//1分钟超时  1 minutes timeout

                myRequest.Method = "POST";

                myResponse = myRequest.GetResponse() as System.Net.HttpWebResponse;

                Stream myResponseStream = myResponse.GetResponseStream();

                StreamReader myStreamReader;

                myStreamReader = new StreamReader(myResponseStream, System.Text.Encoding.GetEncoding("utf-8"));

                //post返回的数据

                string receiveData = myStreamReader.ReadToEnd();

                myStreamReader.Close();

                myResponseStream.Close();

            }

            catch (Exception ex)

            {

                string stacktrace = ex.StackTrace;//获得详细的错误位置

                string errpoint = stacktrace.Substring(stacktrace.IndexOf("位置"), stacktrace.Length - stacktrace.IndexOf("位置"));

                Common.WriteTextLog("Error","", ex.Message + Environment.NewLine + errpoint);

            }

            finally

            {

                if (resStream != null)

                {

                    resStream.Close();

                }

                if (reqStream != null)

                {

                    reqStream.Close();

                }

                if (myResponse != null)

                {

                    myResponse.Close();

                }

                if (myRequest != null)

                {

                    myRequest.Abort();

                }

                ////特别留意这句Sleep的调用！！

                System.Threading.Thread.Sleep();

            }