ASP.NET RadioButtonList 事件未触发

Question

I have a RadioButtonList in my site and it has a OnTextChanged and OnSelectedIndexChanged events that for an unknown reason do not fire when the selection is changed. 这是aspx代码：

<asp:RadioButtonList ID="approvalYesNo" runat="server" OnTextChanged="approvalYesNo_SelectedIndexChanged" OnSelectedIndexChanged="approvalYesNo_SelectedIndexChanged">
    <asp:ListItem>No need</asp:ListItem>
    <asp:ListItem>Required</asp:ListItem>
    </asp:RadioButtonList>

C# 代码（甚至没有开始，因此与内容无关）

protected void approvalYesNo_SelectedIndexChanged(object sender, EventArgs e)
    {

...            
    }

有什么想法吗？

Answer 1

把AutoPostBack="true"放在runat="server"之后