去除页面垃圾代码

    protected override void Render(HtmlTextWriter writer)
    {
        StringWriter sw = new StringWriter();
        HtmlTextWriter htmlWriter = new HtmlTextWriter(sw);
        base.Render(htmlWriter);
        string html = sw.ToString();
        html = Regex.Replace(html, "[\f\n\r\t\v]", "");
        html = Regex.Replace(html, " {2,}", " ");
        html = Regex.Replace(html, ">[ ]{1}", ">");
        writer.Write(html);
    }