ASP.NET SelectedIndex 属性

实例

下面的实例获取 RadioButtonList 控件中的某个 ListItem 的索引：

   <script runat="server">
   Sub Change(obj As Object, e As EventArgs)
     Response.Write("Selected index: " & rb1.SelectedIndex)
   End Sub
   </script>
  
   <form runat=server>
   <asp:RadioButtonList id="rb1" AutoPostBack="true"
   runat="server" OnSelectedIndexChanged="Change">
     <asp:ListItem Text="Item 1" />
     <asp:ListItem Text="Item 2" />
   </asp:RadioButtonList>
   </form>