Render 使用

Page页面文件,重新Render 方法，目的是把页面的ViewState信息放在最后，利于页面展示速度和SEO优化。

Render方法对于重新Html控件还是很好用的。

    private static readonly Regex viewStateRegex = new Regex("<input type="hidden" name="__VIEWSTATE".*/>", RegexOptions.IgnoreCase); //过滤viewstate html标记的正则表达式
    private static readonly Regex endFormRegex = new Regex(@"</form>", RegexOptions.Multiline | RegexOptions.Compiled);

    protected override void Render(HtmlTextWriter writer)
    {
        System.IO.StringWriter stringWriter = new System.IO.StringWriter();
        HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);
        base.Render(htmlWriter);

        string html = stringWriter.ToString();
        Match viewStateMatch = viewStateRegex.Match(html);
        string viewStateString = viewStateMatch.Captures[0].Value;//找出ViewState的Html标记 目的把viewstate的内容放到页面FORM的最后面加快加载速度和搜索抓录
        //  viewStateString = "<input type=/"hidden/" name=/"__VIEWSTATE/" id=/"__VIEWSTATE/" value=/"/" />"; //仿博客园

        html = html.Remove(viewStateMatch.Index, viewStateMatch.Length);//替换掉ViewState的html标记

        Match endFormMath = endFormRegex.Match(html, viewStateMatch.Index);
        html = html.Insert(endFormMath.Index, viewStateString);//将ViewState的Html标记插入到</form>标记之前
        writer.Write(html);

    }

做一头勤恳的技术牛