using System.Text.RegularExpressions

///   <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;

   }

写一个静态方法

  #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   

                  #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;

                   }   

                  #endregion