How is the radiobuttonlist control used?

2 years ago
Isabella Edwards
2 minutes

The RadioButtonList control is a control in ASP.NET Web Forms that displays a group of radio buttons. It is commonly used when users need to select one option, such as selecting gender or choosing an answer for a multiple choice question.

The steps for using the RadioButtonList control are as follows:

  1. Add a RadioButtonList control to an ASP.NET page. It can be added either by dragging and dropping or by manually adding the code.
<asp:RadioButtonList ID="RadioButtonList1" runat="server">
    <asp:ListItem Text="选项1" Value="1"></asp:ListItem>
    <asp:ListItem Text="选项2" Value="2"></asp:ListItem>
    <asp:ListItem Text="选项3" Value="3"></asp:ListItem>
</asp:RadioButtonList>
  1. In the backend code of the page, you can obtain the user’s selected value through the SelectedValue property of the RadioButtonList.
string selectedValue = RadioButtonList1.SelectedValue;
  1. Options can be dynamically added through code.
RadioButtonList1.Items.Add(new ListItem("选项4", "4"));
RadioButtonList1.Items.Add(new ListItem("选项5", "5"));
  1. Other properties of the RadioButtonList can be set, such as allowing multiple selections and styles of choices.
<asp:RadioButtonList ID="RadioButtonList1" runat="server" RepeatLayout="Flow" RepeatDirection="Vertical" CssClass="myRadioButtonList">
    <asp:ListItem Text="选项1" Value="1"></asp:ListItem>
    <asp:ListItem Text="选项2" Value="2"></asp:ListItem>
    <asp:ListItem Text="选项3" Value="3"></asp:ListItem>
</asp:RadioButtonList>

The code mentioned above sets the layout of the RadioButtonList to flow layout, with the options arranged vertically, and adds a custom CSS style to the control.

By following the above steps, you can use the RadioButtonList control in an ASP.NET page to achieve single selection functionality.

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