C# 教程ASP.NET DropDownList SelectedIndex 属性
DropDownList 控件
定义和用法
SelectedIndex 属性用于获取或设置 DropDownList 中被选项目的索引号。
实例
下面的实例输出了被选项目的文本：
<script runat="Server">
Sub GetName(obj As Object, e As EventArgs)
lbl.Text = ddList.SelectedItem.Text
End Sub
</script>
<form runat="Server">
Select a name from the list:
<asp:DropDownList id="ddList" runat="Server">
<asp:ListItem Text="Peter" />
<asp:ListItem Text="Lois" />
<asp:ListItem Text="Cleveland" />
<asp:ListItem Text="Quagmire" />
<asp:ListItem Text="Joe" />
</asp:DropDownList>
<asp:Button Text="Select"
OnClick="GetName" Runat="Server" />
<br />
Name is:
<asp:Label id="lbl" Runat="Server"/>
</form>
Sub GetName(obj As Object, e As EventArgs)
lbl.Text = ddList.SelectedItem.Text
End Sub
</script>
<form runat="Server">
Select a name from the list:
<asp:DropDownList id="ddList" runat="Server">
<asp:ListItem Text="Peter" />
<asp:ListItem Text="Lois" />
<asp:ListItem Text="Cleveland" />
<asp:ListItem Text="Quagmire" />
<asp:ListItem Text="Joe" />
</asp:DropDownList>
<asp:Button Text="Select"
OnClick="GetName" Runat="Server" />
<br />
Name is:
<asp:Label id="lbl" Runat="Server"/>
</form>
演示实例 »
DropDownList 控件