c# - 找不到 AsyncPostBackTrigger 的 ControlID

Question

  <asp:UpdatePanel ID="CartUpdatePanel" runat="server">
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID='<%= rdoSelect.ClientID %>'/>
        </Triggers>
        <ContentTemplate>
            <asp:Timer ID="cartTimer" Interval="5000" runat="server" OnTick="cartTimer_Tick">
            </asp:Timer>
            <asp:GridView ID="gridCartSearch" runat="server" AutoGenerateColumns="False">
                <Columns>
                    <asp:TemplateField HeaderText="Select">
                        <ItemTemplate>

                            <asp:HiddenField ID="Serial" runat="server" Value='<%# Eval("serialnum") %>' />
                            <asp:RadioButton ID="rdoSelect" runat="server" AutoPostBack="true" GroupName="radioBtns"
                                OnCheckedChanged="rdoSelect_CheckedChanged" />
                        </ItemTemplate>
                    </asp:TemplateField>

                </Columns>
            </asp:GridView>
        </ContentTemplate>
    </asp:UpdatePanel>

我收到以下错误

A control with ID '<%= rdoSelect.ClientID %>' could not be found for the trigger in UpdatePanel 'CartUpdatePanel'.

Answer 1

更改以下行:

<asp:AsyncPostBackTrigger ControlID='<%= rdoSelect.ClientID %>'/>

到:

<asp:AsyncPostBackTrigger ControlID='rdoSelect'/>

您不能在服务器控件内使用服务器端标记(如 AsyncPostBackTrigger)。相反，您应该使用控件的 ID，asp.net 运行时将动态地将其替换为正确的客户端 ID。