ASP.NET 去除所有HTML标记 、取出文本图片地址

  ///   <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  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 GetString(Htmlstring,130);
    }

 

   #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