去掉HTML标记 .

///   <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;
                  }

                  #endregion