复制代码 代码如下:

using System;

using System.Net;

using System.Text;

using System.Text.RegularExpressions;

class Program

{

// 获取网页的HTML内容，根据网页的charset自动判断Encoding

static string GetHtml(string url)

{

return GetHtml(url, null);

}

// 获取网页的HTML内容，指定Encoding

static string GetHtml(string url, Encoding encoding)

{

byte[] buf = new WebClient().DownloadData(url);

if (encoding != null) return encoding.GetString(buf);

string html = Encoding.UTF8.GetString(buf);

encoding = GetEncoding(html);

if (encoding == null || encoding == Encoding.UTF8) return html;

return encoding.GetString(buf);

}

// 根据网页的HTML内容提取网页的Encoding

static Encoding GetEncoding(string html)

{

string pattern = @"(?i)bcharset=(?<charset>[-a-zA-Z_0-9]+)";

string charset = Regex.Match(html, pattern).Groups["charset"].Value;

try { return Encoding.GetEncoding(charset); }

catch (ArgumentException) { return null; }

}

// 程序入口

static void Main()

{

Console.WriteLine(GetHtml(http://www.jb51.net));

Console.Read();

}

}