C# HttpHelper帮助类,真正的Httprequest请求时无视编码，无视证书，无视Cookie,网页抓取

//取当前webBrowser登录后的Cookie值
[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref int pcchCookieData, int dwFlags, object lpReserved);

//取出Cookie，当登录后才能取
private static string GetCookieString(string url)
{
// Determine the size of the cookie
int datasize = 256;
StringBuilder cookieData = new StringBuilder(datasize);
if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, null))
{
if (datasize < 0)
return null;
// Allocate stringbuilder large enough to hold the cookie
cookieData = new StringBuilder(datasize);
if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, null))
return null;
}
return cookieData.ToString();
}之前我写过篇关于C# HttpWebRequest 绝技的文章 无视证书的方法请在篇文章里面查找谢谢，以下不做无视证书的方法

无论是Get还是Post 带Cookie，编码问题解决 ，这里完全做到了无视编码的问题

最近把上面的方法整理了一下,这个类相当于一个SqlHelper类一下，我把它叫做HttpHelper类，以后还会慢慢更新，希望大家多我支持，

给大家分享一下吧，不好的地方感谢大家留言指正，不多说了上代码吧！

/// <summary>
/// 类说明：HttpHelps类，用来实现Http访问，Post或者Get方式的，直接访问，带Cookie的，带证书的等方式
/// 编码日期：2011-08-20
/// </summary>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;
using System.IO.Compression;

public class HttpHelps
{
#region 预定义方法或者变更

//默认的编码
private Encoding encoding = Encoding.Default;
//HttpWebRequest对象用来发起请求
private HttpWebRequest request = null;
//获取影响流的数据对象
private HttpWebResponse response = null;
//读取流的对象
private StreamReader reader = null;
//需要返回的数据对象
private string returnData = "String Error";

/// <summary>
/// 根据相传入的数据，得到相应页面数据
/// </summary>
/// <param name="strPostdata">传入的数据Post方式,get方式传NUll或者空字符串都可以</param>
/// <returns>string类型的响应数据</returns>
private string GetHttpRequestData(string strPostdata)
{
try
{
//支持跳转页面，查询结果将是跳转后的页面
request.AllowAutoRedirect = true;

//验证在得到结果时是否有传入数据
if (!string.IsNullOrEmpty(strPostdata) && request.Method.Trim().ToLower().Contains("post"))
{
byte[] buffer = encoding.GetBytes(strPostdata);
request.ContentLength = buffer.Length;
request.GetRequestStream().Write(buffer, 0, buffer.Length);
}

#region 得到请求的response

using (response = (HttpWebResponse)request.GetResponse())
{
//从这里开始我们要无视编码了
if (encoding == null)
{
MemoryStream _stream = new MemoryStream();

if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
{
//开始读取流并设置编码方式
new GZipStream(response.GetResponseStream(), CompressionMode.Decompress).CopyTo(_stream, 10240);
}
else
{
response.GetResponseStream().CopyTo(_stream, 10240);
}
byte[] RawResponse = _stream.ToArray();
string temp = Encoding.Default.GetString(RawResponse, 0, RawResponse.Length);
//<meta(.*?)charset([\s]?)=[^>](.*?)>
Match meta = Regex.Match(temp, "<meta([^<]*)charset=([^<]*)[\"']", RegexOptions.IgnoreCase | RegexOptions.Multiline);
string charter = (meta.Groups.Count > 2) ? meta.Groups[2].Value : string.Empty;
charter = charter.Replace("\"", string.Empty).Replace("'", string.Empty).Replace(";", string.Empty);
if (charter.Length > 0)
{
encoding = Encoding.GetEncoding(charter);
}
else
{
if (response.CharacterSet.ToLower().Trim() == "iso-8859-1")
{
encoding = Encoding.GetEncoding("gbk");
}
else
{
if (string.IsNullOrEmpty(response.CharacterSet.Trim()))
{
encoding = Encoding.UTF8;
}
else
{
encoding = Encoding.GetEncoding(response.CharacterSet);
}
}
}
returnData = encoding.GetString(RawResponse);
}
else
{
if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
{
//开始读取流并设置编码方式
using (reader = new StreamReader(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress), encoding))
{
returnData = reader.ReadToEnd();
}
}
else
{
//开始读取流并设置编码方式
using (reader = new StreamReader(response.GetResponseStream(), encoding))
{
returnData = reader.ReadToEnd();
}
}
}
}

#endregion
}
catch (Exception)
{
//这里是在发生异常时返回的错误信息
returnData = "String Error";
}
return returnData.ToLower();
}