html编辑及JS脚本过滤（优化版） 收藏
这是参考CSDN上高手们的过滤方法，我修改后的方法

就是把  ""  换成string.Empty  从理论上（当数据多的时候）要快点

public string NoHTML(string Htmlstring) //去除HTML标记 
    {
        //删除脚本 
        Htmlstring = Regex.Replace(Htmlstring, @" <script[^>]*?>.*? </script>",string.Empty, RegexOptions.IgnoreCase);
        //删除HTML 
        Htmlstring = Regex.Replace(Htmlstring, @" <(.[^>]*)>",string.Empty, RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"([\r\n])[\s]+",string.Empty, RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"-->",string.Empty, RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @" <!--.*",string.Empty, 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+);",string.Empty, RegexOptions.IgnoreCase);

        Htmlstring.Replace(" <",string.Empty);
        Htmlstring.Replace(">",string.Empty);
        Htmlstring.Replace("\r\n",string.Empty);
        Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();
        return Htmlstring;
    }

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