C#抓取网页

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Security.Cryptography;using System.IO;using System.Drawing.Drawing2D;using System.Data;using System.Text.RegularExpressions;using System.Reflection;using System.Xml.Serialization;using System.Xml;using System.Threading;using System.Net;using System.IO.Compression;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            var url = "http://flights.ctrip.com/booking/bjs-sha----adu-1/";            var param = "dcityname1=北京&acityname1=上海";            var str = GetHTML(url, param);            Console.Read();        }         /// <summary>        /// 获取HTML        /// </summary>        /// <param name="url"></param>        /// <returns></returns>        static string GetHTML(string url, string param)        {            Uri uri = new Uri(url);            HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(uri);             myReq.Headers.Add("Accept-Encoding", "gzip,deflate,sdch");             byte[] byData = Encoding.Default.GetBytes(param);            myReq.Method = "Post";            myReq.ContentLength = byData.Length;            Stream reqStrem = myReq.GetRequestStream();            reqStrem.Write(byData, 0, byData.Length);            reqStrem.Close();             HttpWebResponse result = (HttpWebResponse)myReq.GetResponse();            Stream recStream = result.GetResponseStream();             //如果是Gzip方式则需要解压            recStream = new GZipStream(recStream, CompressionMode.Decompress);             StreamReader redStream = new StreamReader(recStream, System.Text.Encoding.Default);            string strHTML = redStream.ReadToEnd();            redStream.Close();            recStream.Close();            result.Close();             return strHTML;         }    }}