检查后面代码中的单选按钮时出现问题

Gre*_*reg 7 asp.net radio-button

我有一个简单的ASP.NET表单,带有DropDownList和两个RadioButtons(两者都共享相同的GroupName).

在DropDownList的SelectedIndexChanged事件中,我设置Checked=true了两个RadioButtons.

它设置第二个RadioButton很好,但它不会检查第一个.我究竟做错了什么?

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication3._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
    <form id="form1" runat="server">
        <asp:DropDownList runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddl_Changed"
            ID="ddl">
            <asp:ListItem Text="Foo" />
            <asp:ListItem Text="Bar" />
        </asp:DropDownList>
        <asp:RadioButton runat="server" ID="rb1" Text="Foo" GroupName="foobar" />
        <asp:RadioButton runat="server" ID="rb2" Text="Bar" GroupName="foobar" />
    </form>
</body>
</html>

protected void ddl_Changed(object sender, EventArgs e)
{
    if (ddl.SelectedIndex == 0)
        rb1.Checked = true; // <- Doesn't actually work
    else
        rb2.Checked = true;
}
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Ric*_*ton 7

它失败了,因为它试图将它们都设置为选中,这对于组中的无线电按钮是不可能的.

最好的解决方案是使用RadioButtonList:

    <asp:RadioButtonList ID="rblTest" runat="server">
        <asp:ListItem Text="Foo"></asp:ListItem>
        <asp:ListItem Text="Bar"></asp:ListItem>
    </asp:RadioButtonList>
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然后像这样设置所选项目:

    protected void ddl_Changed(object sender, EventArgs e)
    {
        rblTest.ClearSelection();
        rblTest.SelectedIndex = ddl.SelectedIndex;
    }
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小智 6

不确定这是否是正确的方法,但它的工作原理

protected void ddl_Changed(object sender, EventArgs e)
    {
        if (ddl.SelectedIndex == 0)
        {
            rb1.Checked = true;
            rb2.Checked = false;
        }
        else
        {
            rb1.Checked = false;
            rb2.Checked = true;
        }
    }
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