protected override void Render(HtmlTextWriter writer)

    protected override void Render(HtmlTextWriter writer)
    {
        //把最终要输出的html压缩后再输出
        StringWriter html = new StringWriter();
        HtmlTextWriter tw = new HtmlTextWriter(html);
        base.Render(tw);
        string outhtml = html.ToString();
        outhtml = Regex.Replace(outhtml, "\\s+", " ");
        outhtml = Regex.Replace(outhtml, ">\\s+<", "><");
        outhtml = outhtml.Trim();
        writer.Write(outhtml);
    }

    protected override void Render(HtmlTextWriter writer)
    {
        //最终输出前先存为html文件，如果发布最新信息了，可以打开一次default.aspx,然后他又会生成一次html

        //这是默认的Render实现，直接输出到writer中 
        //base.Render(writer); 
        StringWriter html = new StringWriter();
        HtmlTextWriter tw = new HtmlTextWriter(html);
        //通过base.Render()方法，把生成的HTML写入到我们定义的tw中 
        base.Render(tw);
        string path = Server.MapPath("index.html");
        StreamWriter sw = new StreamWriter(path, false, System.Text.Encoding.Default);
        //写入到文件中
        sw.Write(html.ToString());
        sw.Close();
        //写入到writer中，以输出页面的HTML 
        //注意，这里不能再调用base.Render(writer)，会出现错误 
        writer.Write(html.ToString());
    }