asp.net后台代码访问前台html标签

//单击按钮后批量改变li元素的内联文本值及样式
    for (int i = 1; i <= 8; i++)
    {
        HtmlGenericControl li = this.FindControl("li" + i) as HtmlGenericControl;
        li.InnerHtml = "新值" + i.ToString();
        li.Attributes.CssStyle.Value = "color:red";
    }  

Code

//单击按钮后批量改变li元素的内联文本值及样式
    foreach (Control control in ul1.Controls)
    {
        if (control is HtmlGenericControl)
        {
            HtmlGenericControl li = control as HtmlGenericControl;
            li.InnerHtml = "新值" + (counter++).ToString();
            li.Attributes.CssStyle.Value = "color:red";
        }
    }  

Code

//单击按钮后批量改变li元素的内联文本值及样式
        HtmlDocument htmlDoc = new HtmlDocument();
        htmlDoc.LoadHtml(ul1.InnerHtml);
        HtmlNodeCollection lis = htmlDoc.DocumentNode.SelectNodes("li");
        for (int i = 0; i < lis.Count; i++)
        {
            lis[i].InnerHtml = "新值" + (i + 1).ToString();
            lis[i].Attributes.Add("style", "color:red");
        }
        ul1.InnerHtml = htmlDoc.DocumentNode.InnerHtml;  

Code