Asp.net 如何将asyncPostBackTrigger添加到DataGrid中的模板列、项模板和按钮

我需要为DataGrid模板列中的两个按钮添加一个触发器。我发现了一些帖子，上面说使用UniqueID将代码放在代码后面

<asp:Panel ID="pnlEditTopic" runat="server" CssClass="modalPopupEditTopic" Style="display: none;" >
    <table cellspacing="0" class="borderTable0" width="100%" style="">
        <tr style="height:4px">
            <td colspan="6" align="center">
                <asp:ImageButton ID="btnAddTopic" runat="server" AlternateText="Add Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnUpdateTopic" runat="server" AlternateText="Update Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnDeleteTopic" runat="server" AlternateText="Delete Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnDelete.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnEditTopicClose" runat="server" AlternateText="Close Edit Topic Popup" 
                    ImageUrl="~/App_Themes/Common/images/BtnCancel.jpg" Height="28px">
                </asp:ImageButton>
            </td>
        </tr>  
    </table>
 </asp:Panel>

 </ContentTemplate>
 </asp:UpdatePanel>

我的逻辑不正确（或者可能不在正确的位置）。当我运行对象引用时，出现“对象引用未设置为对象实例”错误

<asp:Panel ID="pnlEditTopic" runat="server" CssClass="modalPopupEditTopic" Style="display: none;" >
    <table cellspacing="0" class="borderTable0" width="100%" style="">
        <tr style="height:4px">
            <td colspan="6" align="center">
                <asp:ImageButton ID="btnAddTopic" runat="server" AlternateText="Add Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnUpdateTopic" runat="server" AlternateText="Update Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnDeleteTopic" runat="server" AlternateText="Delete Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnDelete.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnEditTopicClose" runat="server" AlternateText="Close Edit Topic Popup" 
                    ImageUrl="~/App_Themes/Common/images/BtnCancel.jpg" Height="28px">
                </asp:ImageButton>
            </td>
        </tr>  
    </table>
 </asp:Panel>

 </ContentTemplate>
 </asp:UpdatePanel>

我是在我的“gridSelectTrigger.ControlID=btnSessionSelect.UniqueID”语句中得到这个的

<asp:Panel ID="pnlEditTopic" runat="server" CssClass="modalPopupEditTopic" Style="display: none;" >
    <table cellspacing="0" class="borderTable0" width="100%" style="">
        <tr style="height:4px">
            <td colspan="6" align="center">
                <asp:ImageButton ID="btnAddTopic" runat="server" AlternateText="Add Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnUpdateTopic" runat="server" AlternateText="Update Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnDeleteTopic" runat="server" AlternateText="Delete Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnDelete.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnEditTopicClose" runat="server" AlternateText="Close Edit Topic Popup" 
                    ImageUrl="~/App_Themes/Common/images/BtnCancel.jpg" Height="28px">
                </asp:ImageButton>
            </td>
        </tr>  
    </table>
 </asp:Panel>

 </ContentTemplate>
 </asp:UpdatePanel>

此逻辑是否需要位于“ItemDataBound”事件中？还是我的逻辑错了

<%@ Page Title="Admin Session Folders" Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false" CodeFile="AdminAddEditReleaseAndFiles.aspx.vb" Inherits="AdminAddEditReleaseAndFiles" Theme="Standard" %>

<asp:Panel ID="pnlEditTopic" runat="server" CssClass="modalPopupEditTopic" Style="display: none;" >
    <table cellspacing="0" class="borderTable0" width="100%" style="">
        <tr style="height:4px">
            <td colspan="6" align="center">
                <asp:ImageButton ID="btnAddTopic" runat="server" AlternateText="Add Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnUpdateTopic" runat="server" AlternateText="Update Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnDeleteTopic" runat="server" AlternateText="Delete Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnDelete.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnEditTopicClose" runat="server" AlternateText="Close Edit Topic Popup" 
                    ImageUrl="~/App_Themes/Common/images/BtnCancel.jpg" Height="28px">
                </asp:ImageButton>
            </td>
        </tr>  
    </table>
 </asp:Panel>

 </ContentTemplate>
 </asp:UpdatePanel>

谢谢,，

---

詹姆斯明白了。更新面板需要将子项作为触发器设置为true

<asp:Panel ID="pnlEditTopic" runat="server" CssClass="modalPopupEditTopic" Style="display: none;" >
    <table cellspacing="0" class="borderTable0" width="100%" style="">
        <tr style="height:4px">
            <td colspan="6" align="center">
                <asp:ImageButton ID="btnAddTopic" runat="server" AlternateText="Add Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnUpdateTopic" runat="server" AlternateText="Update Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnDeleteTopic" runat="server" AlternateText="Delete Topic" 
                    ImageUrl="~/App_Themes/Common/images/BtnDelete.jpg" Height="28px">
                </asp:ImageButton>
                <asp:ImageButton ID="btnEditTopicClose" runat="server" AlternateText="Close Edit Topic Popup" 
                    ImageUrl="~/App_Themes/Common/images/BtnCancel.jpg" Height="28px">
                </asp:ImageButton>
            </td>
        </tr>  
    </table>
 </asp:Panel>

 </ContentTemplate>
 </asp:UpdatePanel>