c# 使用HttpWebRequest,HttpWebResponse 快速验证代理IP是否有用

我们可以使用HttpWebRequest,HttpWebResponse 来代理验证，谢谢大家评论指导！

呵呵，是不是很简单啊，其实这段代码改一下还可以做采集器，小偷等程序！我不说了大家自己看

 public void yanzhen(string str, int port)

        {

            WebProxy proxyObject = new WebProxy(str, port);//str为IP地址 port为端口号

            HttpWebRequest Req = (HttpWebRequest)WebRequest.Create("http://www.whatismyip.com.tw/");

            Req.Proxy = proxyObject; //设置代理

            //转载请标明来自 问题解决园http://wenti.cnblogs.com/

            //文章地址

            HttpWebResponse Resp = (HttpWebResponse)Req.GetResponse();

            string str = "";

            string OkStr = "";

            Encoding code = Encoding.GetEncoding("UTF-8");

            using (StreamReader sr = new StreamReader(Resp.GetResponseStream(), code))

            {

                if (sr != null)

                {

                    try

                    {

                        str = sr.ReadToEnd();

                        StringSub.substr(str, "<h2>", "</h2>", 0);

                        str = str.Substring(str.IndexOf(start) + start.Length);

                        OkStr = str.Substring(0, str.IndexOf(last));

                        MessageBox.Show("验证成功！显示IP为" + OkStr);

                    }

                    catch

                    {

                        MessageBox.Show("文件读取失败！");

                    }

                    finally

                    {

                        sr.Close();

                    }

                }

            }

        }