ListItem item = new ListItem(text, value, enabled);
当然，也可以用
item.Enabled = false;
虽然在页面中隐藏了，但依然可以用代码来访问隐藏的选项的，下面是一个例子
<%@ Page Language="C#" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack) { ListItem[] items = new ListItem[] { new ListItem("Item 1", "Value 1"), new ListItem("Item 2", "Value 2", false), new ListItem("Item 3", "Value 3"), new ListItem("Item 4", "Value 4")
}; ListBox1.Items.AddRange(items); } } protected void Button1_Click(object sender, EventArgs e) { foreach (ListItem item in ListBox1.Items) { Response.Write(item.Text + " enabled=" + item.Enabled + "<br>"); }
} </script><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <div> <asp:ListBox ID="ListBox1" runat="server" /> <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" /></div> </form></body></html>