自动获取代理IP信息的例子，含代码，分享哦，

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/// <summary>         /// 读取URL数据内容         /// </summary>         /// <param name="url">网址</param>         /// <returns>网站文本内容</returns>         public string HttpGetText(string url)         {             HttpWebRequest Request = (HttpWebRequest)HttpWebRequest.Create(url);             Request.Method = "GET";             Request.ContentType = @"application/x-www-form-urlencoded";             Request.Accept = @"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";             Request.Headers.Add(HttpRequestHeader.AcceptLanguage, @"Accept-Language:zh-CN,zh;q=0.8");             Request.UserAgent = @"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.221 Safari/537.36 SE 2.X MetaSr 1.0";             Request.Proxy = proxy;             var stream = Request.GetResponse().GetResponseStream();             var read = new StreamReader(stream);             var json = read.ReadToEnd();             read.Close();             stream.Close();               System.Diagnostics.Debug.WriteLine("".PadRight(20, '='));             System.Diagnostics.Debug.WriteLine(json);             System.Diagnostics.Debug.WriteLine("".PadRight(20, '='));             return json;         }   public class IPs {             public List<proxy> items = new List<proxy>();               public class proxy {                 public string ip;                 public int port;                 public string address;                 public int speed;                 public int life;//持续分钟数                 public DateTime check_time;             }         }         private void button1_Click(object sender, EventArgs e)         {             var html= HttpGetText("http://www.xicidaili.com/nt");             int i1= html.IndexOf("<table id=\"ip_list\">");             int i2= html.IndexOf("</table>");             string ip_list = html.Substring(i1, i2 - i1+ "</table>".Length);             var find = new Regex(@"<tr.*?>\s*?<td.*?>.*?</td>\s*?<td.*?>(?<ip>.*?)</td>\s*?<td.*?>(?<port>.*?)</td>\s*?<td.*?>\s*?<a.*?>(?<address>.*?)</a>\s*?</td>.*?width:(?<speed>.*?)%.*?<td>(?<life>.*?)</td>.*?<td>(?<check_time>.*?)</td>.*?</tr>", RegexOptions.IgnoreCase | RegexOptions.Singleline);             var ips= find.Matches(ip_list);             listView1.BeginUpdate();             foreach (System.Text.RegularExpressions.Match item in ips) {                 try                 {                     var ip = new IPs.proxy();                     ListViewItem lvi = new ListViewItem(item.Groups["ip"].Value); ip.ip = item.Groups["ip"].Value;                     lvi.SubItems.Add(item.Groups["port"].Value); ip.port = Convert.ToInt32(item.Groups["port"].Value);                     lvi.SubItems.Add(item.Groups["address"].Value); ip.address = item.Groups["address"].Value;                     lvi.SubItems.Add(item.Groups["speed"].Value); ip.speed = Convert.ToInt32(item.Groups["speed"].Value);                     lvi.SubItems.Add(item.Groups["life"].Value); ip.life = conv(item.Groups["life"].Value);                     lvi.SubItems.Add(item.Groups["check_time"].Value); ip.check_time = Convert.ToDateTime(item.Groups["check_time"].Value);                     listView1.Items.Add(lvi);                     IPaddress.items.Add(ip);                 }                 catch {                     LogAdd("转换IP地址信息出错 " + item.Value);                 }             }             listView1.EndUpdate();             int conv(string life) {                 int a = 1;                 if (life.Contains("天")) {                     a = 60 * 24;                     life = life.Replace("天", "");                 }else if (life.Contains("分钟"))                 {                     a =1;                     life = life.Replace("分钟", "");                 }                 else if (life.Contains("小时"))                 {                     a = 60;                     life = life.Replace("小时", "");                 }                 return Convert.ToInt32(life)*a;             }         }

　　

关键代码就是获取指定网页里的IP代理信息，然后用正则表达式提取出来

本来想着直接将html转换为xml，谁知它网页写的不标准，转换不成功

只有用正则来查找了，效果不错~

代码运行环境： vs2017

当然老版本也可以，将局部函数代码放到外部即可。

效果图：

 

关键代码部分：

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var html= HttpGetText("http://www.xicidaili.com/nt");             int i1= html.IndexOf("<table id=\"ip_list\">");             int i2= html.IndexOf("</table>");             string ip_list = html.Substring(i1, i2 - i1+ "</table>".Length);             var find = new Regex(@"<tr.*?>\s*?<td.*?>.*?</td>\s*?<td.*?>(?<ip>.*?)</td>\s*?<td.*?>(?<port>.*?)</td>\s*?<td.*?>\s*?<a.*?>(?<address>.*?)</a>\s*?</td>.*?width:(?<speed>.*?)%.*?<td>(?<life>.*?)</td>.*?<td>(?<check_time>.*?)</td>.*?</tr>", RegexOptions.IgnoreCase | RegexOptions.Singleline);             var ips= find.Matches(ip_list);

　　正则表达式推荐一个网址及学习工具：

http://deerchao.net/tutorials/regex/regex.htm#charclass

 

我本人也记不住 正则表达式  ，需要用的时候现查。