ID为“btnUpload”控制找不到在触发UpdatePanel的“pnlUpdate”

Question

您好我有，我想更新面板内放置一个用户控制和我的代码看起来像这样

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="QuestionControl.ascx.cs" 
Inherits="ProcessFramework.QuestionControl" %> 
<%@ Register Assembly="AspNetPager" Namespace="Wuqi.Webdiyer" TagPrefix="webdiyer" %> 
<asp:UpdatePanel ID="pnlUpdate" runat="server"> 
<Triggers> 
<asp:PostBackTrigger ControlID="btnUpload" /> 
</Triggers> 
<ContentTemplate> 
    <asp:DataList ID="QuestionList" runat="server" OnItemDataBound="QuestionList_ItemDataBound" 
     OnEditCommand="LinkButton1_EditCommand"> 
     <ItemTemplate> 
      <div class="QuestionObject"> 
       <asp:HiddenField ID="QuestionID" runat="server" Value='<%# Eval("QuestionID") %>' /> 
       <span class="QuestionsLabel"> 
        <h2> 
         <asp:Label ID="QuestionTextLabel" runat="server" Text='<%# Eval("QuestionText") %>'></asp:Label></h2> 
       </span> 
       <asp:Panel ID="LinkPanel" runat="server" Visible='<%# Eval("HasLink") %>' CssClass="QuestionsLink"> 
        <asp:HyperLink runat="server" ID="QuestionLink" Text='<%# Eval("LinkText") %>' Target="_blank" 
         NavigateUrl='<%# Eval("LinkURI") %>'></asp:HyperLink> 
       </asp:Panel> 
       <br /> 
       <asp:Panel ID="ResponseInputPanel" runat="server" Visible="false" CssClass="QuestionsText"> 
        <asp:TextBox runat="server" Text='<%# Eval("Response") %>' TextMode="MultiLine" CssClass="TextArea" 
         ID="QuestionResponseTextBox"> 
        </asp:TextBox><asp:HtmlEditorExtender ID="HtmlEditorExtender1" TargetControlID="QuestionResponseTextBox" 
         runat="server" EnableSanitization="false" DisplaySourceTab="true"> 
         <Toolbar> 
          <asp:Undo /> 
          <asp:Redo /> 
          <asp:Bold /> 
          <asp:Italic /> 
          <asp:Underline /> 
          <asp:StrikeThrough /> 
          <asp:Subscript /> 
          <asp:Superscript /> 
          <asp:JustifyLeft /> 
          <asp:JustifyCenter /> 
          <asp:JustifyRight /> 
          <asp:JustifyFull /> 
          <asp:InsertOrderedList /> 
          <asp:InsertUnorderedList /> 
          <asp:CreateLink /> 
          <asp:UnLink /> 
          <asp:RemoveFormat /> 
          <asp:SelectAll /> 
          <asp:UnSelect /> 
          <asp:Delete /> 
          <asp:BackgroundColorSelector /> 
          <asp:ForeColorSelector /> 
          <asp:FontNameSelector /> 
          <asp:FontSizeSelector /> 
          <asp:Indent /> 
          <asp:Outdent /> 
          <asp:InsertHorizontalRule /> 
          <asp:HorizontalSeparator /> 
          <asp:Cut /> 
          <asp:Copy /> 
          <asp:Paste /> 
         </Toolbar> 
        </asp:HtmlEditorExtender> 
        <div class="QuestionActions"> 
         <asp:LinkButton ID="lnkClear" runat="server" Text="Clear" OnCommand="lnkClearA_OnCommand" 
          CommandArgument='<%# Container.ItemIndex %>' Visible="false"> 
         </asp:LinkButton> 
         <label> 
          |</label> 
         <asp:LinkButton ID="LinkClearAll" runat="server" Text="Preview" OnCommand="lnkClearAllResponse_OnCommand" 
          CommandArgument='<%# Container.ItemIndex %>' Visible="false"> 
         </asp:LinkButton> 
         <asp:Panel ID="AttachmentPanel" runat="server" Visible='<%# Eval("HasAttachment") %>' 
          CssClass="QuestionsAttachment"> 
          <asp:Panel ID="AttachmentPanelUploadSection" runat="server" Visible='<%# (bool.Parse(Eval("IsAttachmentExist").ToString()) == false) %>'> 
           <asp:Literal ID="AttachFileLabel" runat="server" Text="Attach file (Max 10MB):" /><asp:FileUpload 
            ID="FileUpload1" runat="server" CssClass="button" /> 
           <asp:Button ID="btnUpload" runat="server" Text="Upload" CssClass="button" OnCommand="btnUpload_OnCommand" 
            CommandArgument='<%# Container.ItemIndex %>' /> 
          </asp:Panel> 
          <asp:Panel ID="AttachmentPanelFileInfoSection" runat="server" Visible='<%# Eval("IsAttachmentExist") %>'> 
           Attachment: 
           <asp:Literal ID="AttachementFileName" runat="server" Text='<%# Eval("AttachmentURI") %>' 
            Visible="true" /> 
           <asp:LinkButton ID="RemoveAttachment" runat="server" CommandArgument='<%# Container.ItemIndex %>' 
            CssClass="imagelink" OnCommand="lnkRemoveAttachment_OnCommand" ToolTip="Remove" 
            Height="16px">      
           </asp:LinkButton> 
          </asp:Panel> 
         </asp:Panel> 
        </div> 
       </asp:Panel> 
       <asp:Panel ID="ResponseLabelPanel" runat="server" Visible="true"> 
        <div class="QuestionsResponse"> 
         <asp:Literal ID="ResponseLiteral" runat="server" Text='<%# Eval("Response") %>' /> 
        </div> 
        <asp:LinkButton ID="LinkEditResponse" runat="server" Text="Edit" OnCommand="lnkEditResponse_OnCommand" 
         CommandArgument='<%# Container.ItemIndex %>'> 
        </asp:LinkButton> 
        <asp:Image ID="AttachmentIcon" runat="server" Visible='<%# (bool.Parse(Eval("IsAttachmentExist").ToString()) == true) %>' 
         ImageUrl="~/Content/Images/attachment.png" Width="14" Height="14" Style="float: right; 
         position: relative" /> 
        <asp:LinkButton ID="LinkButton1" ToolTip="Download Attachment" runat="server" CommandName="Edit" 
         CssClass="linkbutton" Visible='<%# (bool.Parse(Eval("IsAttachmentExist").ToString()) == true) %>' 
         CommandArgument='<%# Eval("AttachmentURI") %>' Text='<%# Eval("AttachmentURI") %>' /> 
       </asp:Panel> 
      </div> 
     </ItemTemplate> 
     <SelectedItemStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" /> 
     <SeparatorTemplate> 
      <hr style="margin-top: 5px" /> 
     </SeparatorTemplate> 
    </asp:DataList> 
    <asp:HiddenField ID="ObjID" runat="server" /> 
    <br /> 
    <table style="width: 200px;" align="right"> 
     <tr> 
      <td> 
       <asp:Button ID="btnCancel" runat="server" CssClass="btn" OnClick="btnCancel_Click" 
        Text="Cancel" Visible="false" /> 
      </td> 
      <td> 
       <asp:Button ID="btnSubmit" runat="server" CssClass="btn" OnClick="btnSubmit_Click" 
        Text="Save" Visible="false" /> 
      </td> 
     </tr> 
    </table> 
    <br /> 
    <br /> 
    <hr /> 
    <webdiyer:AspNetPager ID="AspNetPager1" runat="server" Width="100%" HorizontalAlign="center" 
     OnPageChanged="AspNetPager1_PageChanged" PageSize="1" ShowPageIndexBox="Never" 
     AlwaysShowFirstLastPageNumber="true" PagingButtonSpacing="5" UrlPaging="false" 
     AlwaysShow="false" CssClass="paginator" CurrentPageButtonClass="cpb"> 
    </webdiyer:AspNetPager> 
</ContentTemplate> 

因为我正在更新面板中放置文件上传控件，我还设置了回发触发器和控件控件ID，作为点击我正在上传数据的按钮ID的ID。这个问题是否发生，因为我把我的按钮放在控件中？任何机构可以帮助我解决这个问题吗？

Answer 1

由于我的用户控件是DataList控件我没有在ItemCreated事件以下和功能是通过添加'RUNAT =“服务器”`id为你的`div`做工精细

protected void QuestionList_ItemCreated(Object sender, DataListItemEventArgs e) 
    { 
     Control uploadButton = e.Item.FindControl("btnUpload"); 
     Control DownloadLinkButton = e.Item.FindControl("LinkButton1");         
     if (uploadButton != null) 
     { 
      ScriptManager mgr = ScriptManager.GetCurrent(this.Page);     
      mgr.RegisterPostBackControl(uploadButton); 
      mgr.RegisterPostBackControl(DownloadLinkButton);     
     } 
    }