所以我已经被这个问题困住了好几个小时，搜索了论坛，尝试了人们建议的一切，但我就是无法让它工作。
我有一个（相当大的）网络表单。表单上的某处是一个 updatePanel，其中包含一个 CuteSoft Ajax Uploader 控件。当上传文件时，该控件在我的代码中调用一个函数 - 这工作正常。在该函数中，我对 updatePanel 中的内容进行了一些更改（添加缩略图等），但是这些更改永远不会反映在前端。
这是表格（去掉了不相关的部分）：
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="VehicleSubmissionWizard.ascx.cs"
Inherits="MaxAdmin.UserControls.VehicleSubmissionWizard" %>
...
<div id="template3" style="display: none;">
<div class="top-section">
<div id="column-left">
...
<div id="column-right">
...
<form runat="server" id="form1" action="">
<%--Panel 1--%>
<asp:Panel runat="server" ID="pnlSubmissionWizard1">
...
</asp:Panel>
<%--/Panel 1--%>
<%--Panel 2--%>
<asp:Panel runat="server" ID="pnlSubmissionWizard2">
...
<h2>
Vehicle images</h2>
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true"
AjaxFrameworkMode="Enabled" ClientIDMode="Static" EnableViewState="true" LoadScriptsBeforeUI="true"
ScriptMode="Auto" ViewStateMode="Enabled">
</asp:ScriptManager>
<asp:UpdatePanel runat="server" EnableViewState="false" ID="upImageUpload" UpdateMode="Conditional">
<Triggers>
<%-- <asp:AsyncPostBackTrigger ControlID="Uploader"
EventName="FileUploaded" />
--%>
</Triggers>
<ContentTemplate>
<input id="hdnImages" class="imagesUpload" type="hidden" />
<asp:HiddenField ID="hdn" runat="server" />
<CuteWebUI:Uploader ID="Uploader" runat="server" EnableViewState="false" MaxFilesLimit="3"
MaxFilesLimitMsg="Please upload a maximum of 3 photos" InsertButtonStyle-Width="280px"
MultipleFilesUpload="true" InsertText="Upload Photos [Max 3 Photos at up to 4mb each]"
OnFileUploaded="Uploader_FileUploaded" OnUploadCompleted="Uploader_Complete">
<ValidateOption MaxSizeKB="4096" AllowedFileExtensions="jpg,gif,png" />
</CuteWebUI:Uploader>
<div id="attachmentsDiv">
<CuteWebUI:UploadAttachments EnableViewState="false" runat="server" ID="Attachments"
MaxFilesLimit="3" Visible="false">
<ValidateOption MaxSizeKB="4096" AllowedFileExtensions="jpg,gif,png" />
</CuteWebUI:UploadAttachments>
</div>
<br />
<asp:Panel ID="pnlImageDetails_1" runat="server" CssClass="display_none" Style="float: left;
margin-bottom: 0">
<div class="uploadedImage" style="clear: both; float: left; margin: 5px 20px 5px 75px;">
<div style="text-align: center">
<asp:Image ID="imgUploadedImage1" runat="server" />
</div>
<div style="text-align: center">
<asp:LinkButton ID="btnRemoveImage_1" runat="server" OnCommand="RemoveImage_Click"
CommandName="1" Text="Remove Image" CssClass="RemoveLinkButton" Style="margin-left: 15px;" />
</div>
</div>
</asp:Panel>
<asp:Panel ID="pnlImageDetails_2" runat="server" CssClass="display_none" Style="float: left;">
<div class="uploadedImage" style="clear: both; float: left; margin: 5px 20px 5px 20px;">
<div style="text-align: center">
<asp:Image ID="imgUploadedImage2" runat="server" />
</div>
<div style="text-align: center">
<asp:LinkButton ID="btnRemoveImage_2" runat="server" OnCommand="RemoveImage_Click"
CommandName="2" Text="Remove Image" CssClass="RemoveLinkButton" Style="margin-left: 15px;" />
</div>
</div>
</asp:Panel>
<asp:Panel ID="pnlImageDetails_3" runat="server" CssClass="display_none" Style="float: left;">
<div class="uploadedImage" style="clear: both; float: left; margin: 5px 20px 5px 20px;">
<div style="text-align: center">
<asp:Image ID="imgUploadedImage3" runat="server" />
</div>
<div style="text-align: center">
<asp:LinkButton ID="btnRemoveImage_3" runat="server" OnCommand="RemoveImage_Click"
CommandName="3" Text="Remove Image" CssClass="RemoveLinkButton" Style="margin-left: 15px;" />
</div>
</div>
</asp:Panel>
<script language="javascript" type="text/javascript">
var Image_Count = $('#<%= hdn.ClientID %>').val();
</script>
</ContentTemplate>
</asp:UpdatePanel>
...
</asp:Panel>
<%-- / Panel 2--%>
<%--Panel 3--%>
<asp:Panel runat="server" ID="pnlSubmissionWizard3">
...
</asp:Panel>
<%-- / Panel 3--%>
<%-- Panel 4--%>
<asp:Panel Visible="false" runat="server" ID="pnlSubmissionWizard4">
...
</asp:Panel>
<%-- / Panel 4--%>
</form>
...
</div>
代码隐藏看起来像这样：
...
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
//Uploader.FileUploaded += new CuteWebUI.UploaderEventHandler(Uploader_FileUploaded);
Uploader.FileUploaded += Uploader_FileUploaded;
Uploader.UploadCompleted += Uploader_Complete;
Attachments.AttachmentRemoveClicked += Attachments_AttachmentRemoveClicked;
Attachments.InsertButton.Style["display"] = "none";
((HiddenField)FindControl("hdn")).Value = "0";
}
...
protected void Uploader_FileUploaded(object sender, CuteWebUI.UploaderEventArgs args)
{
...
using (System.IO.Stream stream = args.OpenStream())
{
// Check if file already exists - seems to do each image twice for some reason...
foreach (var ph in Photos)
if (String.Equals(ph.FileName, args.FileName))
return;
...
// Show image thumbnail
ShowUploadedPhotoDetails(p, ImageCount);
}
}
catch (Exception ex)
{
...
}
}
private void ShowUploadedPhotoDetails(Photo photo, int imageNo)
{
if (imageNo <= 3)
{
var imagePanel = (Panel)FindControl(String.Concat("pnlImageDetails_", imageNo));
imagePanel.CssClass = "display_block";
imagePanel.Visible = true;
var uploadedImage = (System.Web.UI.WebControls.Image)FindControl(String.Concat("imgUploadedImage", imageNo));
uploadedImage.ImageUrl = photo.ImageUrlThumb;
uploadedImage.Visible = true;
uploadedImage.CssClass = "CSS_CLASS";
}
}
protected void Uploader_Complete(object sender, CuteWebUI.UploaderEventArgs[] args)
{
Uploader uploader = (Uploader)sender;
uploader.InsertButton.Enabled = (Photos.Count < 3);
// Force updatePanel to update
upImageUpload.Update();
}
因此，当上传图像时，上述两个函数都会触发。图像数据很好。调试分配给控件的值（例如：ImageUrl、CssClass 等）表明它们已正确分配给控件。但是这些值永远不会在前端刷新。
有什么我错过的想法吗？
非常感谢格雷格