如何在C#中使用动态代理IP接口抓取数据

using System;

namespace TestDynamicIp{
	
	class Program{
		
		static string order = "这里需要改成无忧代理IP的接口单号，示例才可以运行";
		static bool run = true;
		static string ipApi = "http://api.ip.data5u.com/dynamic/get.html?order=" + order;
		static string targetUrl = "http://1212.ip138.com/ic.asp";
		
		public static void Main(string[] args){			
			Console.WriteLine("\n********************\nC#测试动态代理IP\n********************\n");
			CrawlIP138();			
			Console.WriteLine("\n********************\n测试结束，按任意键退出程序\n********************\n");
			Console.ReadKey(true);
		}
		
		public static void CrawlIP138(){
			for(int i = 0; i< 10; i++){
				Console.WriteLine("\n>>>>>>>>>>>>>>>>>>>>>>>第" + i + "次请求测试");
				// 获取动态IP				
				Uri uri = new Uri(ipApi);
				System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(ipApi);
				System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
				System.IO.Stream stream = response.GetResponseStream();
				System.IO.StreamReader reader = new System.IO.StreamReader(stream);
				String iptxt = reader.ReadToEnd();
				reader.Dispose();
				reader.Close();
				string[] ipports = iptxt.Split(new String[]{"\n"}, StringSplitOptions.None);
				System.Threading.Thread.Sleep(1000);
				try{
					// 定义client
					string ipport = ipports[(int)(ipports.Length * new Random().Next(0, 1))];
					System.Net.WebClient client = new System.Net.WebClient();
					client.Encoding = System.Text.Encoding.GetEncoding("GB2312");
					// 设置代理
					System.Net.WebProxy proxy = new System.Net.WebProxy();
					proxy.Address = new Uri("http://" + ipports[0] + "/");
					client.Proxy = proxy;
					// 获取网页内容
					byte[] byResponse = client.DownloadData(targetUrl);
					String txt = System.Text.Encoding.GetEncoding("GB2312").GetString(byResponse);
					Console.WriteLine("使用代理" + ipports[0] + "得到如下内容：\n" + txt);
					client.Dispose();
				}catch(Exception e){}
			}
		}
	}
}