#region =====过滤html标签 RemoveHTML(string html)=====
        /// <summary>
        /// 过滤html
        /// </summary>
        /// <param name="html">需要过滤的字符串</param>
        /// <returns>过滤html后的字符串</returns>
        public static string RemoveHTML(string html)
        {
            html = Regex.Replace(html, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"-->", "", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"<!--.*", "", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"&#(\d+);", "", RegexOptions.IgnoreCase);
            html = Regex.Replace(html, @"<img[^>]*>;", "", RegexOptions.IgnoreCase);
            html.Replace("<", "");
            html.Replace(">", "");
            html.Replace("\r\n", "");
            //html = HttpContext.Current.Server.HtmlEncode(html).Trim();
            //html = HttpContext.Current.Server.HtmlDecode(html).Trim();
            return html;
        }
        #endregion