c# 拉取网页

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;


namespace xsharp
{
    class Program
    {
        static int writeContent(string  sHtml)
        {
            int iBgnIdx = sHtml.IndexOf("<div id=\"chaptercontent");
            if (iBgnIdx <= 0)
                return -1;
            int iEndIdx = sHtml.IndexOf("</div>", iBgnIdx+1);
            if (iEndIdx <= 0)
                return -1;

            string sDivSub = sHtml.Substring(iBgnIdx, iEndIdx - iBgnIdx);
            
            iBgnIdx = sDivSub.IndexOf("</p>");
            if (iBgnIdx <= 0)
                return -1;
            iEndIdx = sDivSub.IndexOf("<p style", iBgnIdx + 5);
            if (iEndIdx <= 0)
                return -1;
            string sContentSub = sDivSub.Substring(iBgnIdx+5, iEndIdx - iBgnIdx-5);
            sContentSub = sContentSub.Replace(" ", " ");
            sContentSub = sContentSub.Replace("<br />", Environment.NewLine);

            Console.WriteLine(sContentSub);
            using (StreamWriter sw = new StreamWriter("G:\\content.html"))//将获取的内容写入文本
            {
                sw.Write(sContentSub);
            }
            return 0;
        }
        static void Main(string[] args)
        {
            try
            {
                WebClient MyWebClient = new WebClient();
                MyWebClient.Credentials = CredentialCache.DefaultCredentials;//获取或设置用于对向Internet资源的请求进行身份验证的网络凭据。
                Byte[] pageData = MyWebClient.DownloadData("http://wap.xxbiquge.com/59_59865/3184122.html"); //从指定网站下载数据

                //string pageHtml = Encoding.Default.GetString(pageData);  //如果获取网站页面采用的是GB2312，则使用这句    
                string pageHtml = Encoding.UTF8.GetString(pageData); //如果获取网站页面采用的是UTF-8，则使用这句
                //Console.WriteLine(pageHtml);//在控制台输入获取的内容

                writeContent(pageHtml);

                //using (StreamWriter sw = new StreamWriter("G:\\ouput.html"))//将获取的内容写入文本
                //{
                //    sw.Write(pageHtml);
                //}

                Console.ReadLine(); //让控制台暂停,否则一闪而过了     
            }
            catch (WebException webEx)
            {
                Console.WriteLine(webEx.Message.ToString());

            }

        }
    }
}