Question

<asp:RadioButton ID="RadioButton1" runat="server" Text="A" GroupName="rbn" />
<asp:RadioButton ID="RadioButton2" runat="server" Text="B" GroupName="rbn" />
<asp:RadioButton ID="RadioButton3" runat="server" Text="C" GroupName="rbn"/>
<asp:RadioButton ID="RadioButton4" runat="server" Text="D" GroupName="rbn"/>
<asp:Button ID="Button1" runat="server" Text="Validate" OnClick="Button1_Click" />
<asp:Label ID="Label1" runat="server" Text=""></asp:Label>

点击按钮Validate它应该验证单选按钮组rbn并在Label1中显示已检查的单选按钮文本。

这应该在C＃中完成。请不要使用任何脚本和for循环。

帮我解决这个问题并提前致谢

Answer 1

您可以使用RadioButtonList代替RadioButton。要验证RadioButtonList，请使用内置验证控件RequiredFieldValidator来验证整个列表。

.aspx

<asp:RadioButtonList ID="RadioButtonList1" RepeatColumns="2"
    RepeatDirection="Vertical" RepeatLayout="Table" runat="server">
    <asp:ListItem>A</asp:ListItem>
    <asp:ListItem>B</asp:ListItem>
    <asp:ListItem>C</asp:ListItem>
    <asp:ListItem>D</asp:ListItem>
</asp:RadioButtonList>
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator1"
    ControlToValidate="RadioButtonList1" Text="Required">
</asp:RequiredFieldValidator>

<asp:Button ID="Button1" runat="server" Text="Validate" OnClick="Button1_Click" />
<asp:Label ID="Label1" runat="server" Text=""></asp:Label>

.aspx.cs:

protected void Button1_Click(object sender, EventArgs e)  
{  
    Label1.Text = "You selected: ";  
    Label1.Text += RadioButtonList1.SelectedItem.Text.ToString();  
}

注意：RequiredFieldValidator必须位于RadioButtonList（而不是每个ListItem）。

<强>更新

当您需要RadioButtons代替RadioButtonList时，请尝试以下操作：

HTML

<input type="radio" value="A" name="radiodbtn" runat="server" /> A
<input type="radio" value="B" name="radiodbtn" runat="server" /> B
<input type="radio" value="C" name="radiodbtn" runat="server" /> C
<input type="radio" value="D" name="radiodbtn" runat="server" /> D

<asp:CustomValidator runat="server" ID="validateCheckBoxes" EnableClientScript="true" 
OnServerValidate="validateCheckBoxes_ServerValidate" 
OnClientValidate="validateCheckBoxes_ClientValidate">Required</asp:CustomValidator>

然后为客户端验证添加Javascript：

<script type="text/javascript">
function CheckBoxRequired_ClientValidate(sender, e) 
{ 
    e.IsValid = $("input[name='radiodbtn']").is(':checked'); 
} 
</script>

现在添加服务器端验证：

protected void validateCheckBoxes_ServerValidate(object sender, ServerValidateEventArgs e) 
{ 
e.IsValid = RadioButton1.Checked || RadioButton2.Checked || RadioButton3.Checked || RadioButton4.Checked;
if(e.IsValid)
{
// at least any one radio button is checked among all group
}
else
{
// no radio button is checked among all group
}

Answer 2

您可以使用RadioButtonList而不是Radiobutton Group。这是示例代码

<asp:RadioButtonList ID="rbList" runat="server">
<asp:ListItem Text="Option1" Value="A" Selected="True"></asp:ListItem> // Selected attribute is used to select a default value
<asp:ListItem Text="Option2" Value="B"></asp:ListItem>
</asp:RadioButtonList>

代码背后的

protected void btnGetValue_Click(object sender, EventArgs e)
{
     string OptionName = rbList.SelectedValue;
}

您将所选的选项值输入OptionName变量

按钮单击验证C＃中的单选按钮组

2 个答案: