vb.net单选按钮列表检查是否已选中

Question

I have the following:

    <asp:RadioButtonList ID="rbIsRep" runat="server"  RepeatDirection="horizontal" >
        <asp:ListItem Value="1" >Yes</asp:ListItem>
        <asp:ListItem Value="0" >No</asp:ListItem>
    </asp:RadioButtonList>

how do I check if the radiobuttonlist has any selected items?

Answer 1

Use the SelectedIndex proprty to check if anything is selected and the SelectedItem property to get the selected item's text:

If rbIsRep.SelectedIndex > - 1 Then
    Dim selectedItemsText = "You selected: " & rbIsRep.SelectedItem.Text
End If

You can change the selection programmatically for example with the SelectedValue property.

rbIsRep.SelectedValue = "0"

or declaratively from aspx

<asp:RadioButtonList ID="rbIsRep" runat="server"  RepeatDirection="horizontal" >
    <asp:ListItem Value="1" >Yes</asp:ListItem>
    <asp:ListItem Selected="True" Value="0" >No</asp:ListItem>
</asp:RadioButtonList>

Answer 2

One way to do it:

var hasSelection = yourRadioButtonList.SelectedIndex != -1;

And for VB.NET:

Dim hasSelection = yourRadioButtonList.SelectedIndex <> -1