using System;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;

class Program
{
// 獲取網頁的HTML內容，根據網頁的charset自動判斷Encoding
static string GetHtml(string url)
{
return GetHtml(url, null);
}

// 獲取網頁的HTML內容，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);
}

// 根據網頁的HTML內容提取網頁的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(//www.survivalescaperooms.com));

Console.Read();
}
}