asp.net过滤HTML标签的几个函数

/**/ ///   <summary>
///   去除HTML标记
///   </summary>
///   <param   name=\”NoHTML\”>包括HTML的源码   </param>
///   <returns>已经去除后的文字</returns>
public static string NoHTML(string Htmlstring)
{
//删除脚本
Htmlstring = Regex.Replace(Htmlstring, @\”<script[^>]*?>.*?</script>\”, \”\”,
    RegexOptions.IgnoreCase);
//删除HTML
Htmlstring = Regex.Replace(Htmlstring, @\”<(.[^>]*)>\”, \”\”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”([\\r\\n])[\\s]+\”, \”\”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”–>\”, \”\”, RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”<!–.*\”, \”\”, RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”&(quot|#34);\”, \”\\\”\”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”&(amp|#38);\”, \”&\”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”&(lt|#60);\”, \”<\”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”&(gt|#62);\”, \”>\”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”&(nbsp|#160);\”, \”   \”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”&(iexcl|#161);\”, \”\\xa1\”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”&(cent|#162);\”, \”\\xa2\”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”&(pound|#163);\”, \”\\xa3\”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”&(copy|#169);\”, \”\\xa9\”,
    RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @\”&#(\\d+);\”, \”\”,
    RegexOptions.IgnoreCase);

Htmlstring.Replace(\”<\”, \”\”);
Htmlstring.Replace(\”>\”, \”\”);
Htmlstring.Replace(\”\\r\\n\”, \”\”);
Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();

return Htmlstring;
}

/**/ ///提取HTML代码中文字的C#函数
///   <summary>
///   去除HTML标记
///   </summary>
///   <param   name=\”strHtml\”>包括HTML的源码   </param>
///   <returns>已经去除后的文字</returns>
using System;
using System.Text.RegularExpressions;
public class StripHTMLTest
{
public static void Main()
{
    string s = StripHTML(
      \”<HTML><HEAD><TITLE>中国石龙信息平台</TITLE></HEAD><BODY>faddfs龙信息平台</BODY></HTML>\”);
    Console.WriteLine(s);
}

public static string StripHTML(string strHtml)
{
    string[]aryReg =
    {
      @\”<script[^>]*?>.*?</script>\”,

      @\”<(\\/\\s*)?!?((\\w+:)?\\w+)(\\w+(\\s*=?\\s*(([\”\”\’])(\\\\[\”
        \”\’tbnr]|[^\\7])*?\\7|\\w+)|.{0})|\\s)*?(\\/\\s*)?>\”, @\”([\\r\\n])[\\s]+\”, @
        \”&(quot|#34);\”, @\”&(amp|#38);\”, @\”&(lt|#60);\”, @\”&(gt|#62);\”, @
        \”&(nbsp|#160);\”, @\”&(iexcl|#161);\”, @\”&(cent|#162);\”, @\”&(pound|#163);\”,
        @\”&(copy|#169);\”, @\”&#(\\d+);\”, @\”–>\”, @\”<!–.*\\n\”
    };

    string[]aryRep =
    {
      \”\”, \”\”, \”\”, \”\\\”\”, \”&\”, \”<\”, \”>\”, \”   \”, \”\\xa1\”, //chr(161),
      \”\\xa2\”, //chr(162),
      \”\\xa3\”, //chr(163),
      \”\\xa9\”, //chr(169),
      \”\”, \”\\r\\n\”, \”\”
    };

    string newReg = aryReg[0];
    string strOutput = strHtml;
    for (int i = 0; i < aryReg.Length; i++)
    {
      Regex regex = new Regex(aryReg[i], RegexOptions.IgnoreCase);
      strOutput = regex.Replace(strOutput, aryRep[i]);
    }
    strOutput.Replace(\”<\”, \”\”);
    strOutput.Replace(\”>\”, \”\”);
    strOutput.Replace(\”\\r\\n\”, \”\”);
    return strOutput;
}
}

写一个静态方法移除HTML标签
#region
///移除HTML标签
/**/ ///   <summary>
///   移除HTML标签
///   </summary>
///   <param   name=\”HTMLStr\”>HTMLStr</param>
public static string ParseTags(string HTMLStr)
{
return System.Text.RegularExpressions.Regex.Replace(HTMLStr, \”<[^>]*>\”, \”\”);
}

#endregion

///   取出文本中的图片地址
#region
///   取出文本中的图片地址
/**/ ///   <summary>
///   取出文本中的图片地址
///   </summary>
///   <param   name=\”HTMLStr\”>HTMLStr</param>
public static string GetImgUrl(string HTMLStr)
{
string str = string.Empty;
string sPattern = @\”^<img\\s+[^>]*>\”;
Regex r = new Regex(@\”<img\\s+[^>]*\\s*src\\s*=\\s*([\’]?)(?<url>\\S+)\’?[^>]*>\”,
    RegexOptions.Compiled);
Match m = r.Match(HTMLStr.ToLower());
if (m.Success)
    str = m.Result(\”${url}\”);
return str;
}