C# - 如何更改HTML元素属性

Question

我的母版页包含一个列表,如下所示.我想做的是将"class = active"属性添加到当前活动的列表li但我不知道如何执行此操作.我知道代码进入了aspx页面的page_load事件,但不知道如何访问我需要添加属性的li.请赐教.非常感谢.

<div id="menu">
  <ul id="nav">
    <li class="forcePadding"><img src="css/site-style-images/menu_corner_right.jpg" /></li>               
    <li id="screenshots"><a href="screenshots.aspx" title="Screenshots">Screenshots</a></li>
    <li id="future"><a href="future.aspx" title="Future">Future</a></li>
    <li id="news"><a href="news.aspx" title="News">News</a></li>
    <li id="download"><a href="download.aspx" title="Download">Download</a></li>
    <li id="home"><a href="index.aspx" title="Home">Home</a></li>
    <li class="forcePadding"><img src="css/site-style-images/menu_corner_left.jpg" /></li>
  </ul>
</div>

Answer 1

为了从服务器端访问这些控件,您需要使它们成为runat ="server"

<ul id="nav" runat="server">
  <li class="forcePadding"><img src="css/site-style-images/menu_corner_right.jpg" /></li>               
  <li id="screenshots"><a href="screenshots.aspx" title="Screenshots">Screenshots</a></li>
  <li id="future"><a href="future.aspx" title="Future">Future</a></li>
  <li id="news"><a href="news.aspx" title="News">News</a></li>
  <li id="download"><a href="download.aspx" title="Download">Download</a></li>
  <li id="home"><a href="index.aspx" title="Home">Home</a></li>
  <li class="forcePadding"><img src="css/site-style-images/menu_corner_left.jpg" /></li>
</ul>

在代码隐藏中:

foreach(Control ctrl in nav.controls)
{
   if(!ctrl is HtmlAnchor)
   {
      string url = ((HtmlAnchor)ctrl).Href;
      if(url == GetCurrentPage())  // <-- you'd need to write that
         ctrl.Parent.Attributes.Add("class", "active");
   }
}