隐藏/显示的 AsyncFileUpload 控件不会触发服务器端 UploadedComplete 事件 [英] Hidden/Shown AsyncFileUpload Control Doesn't Fire Server-Side UploadedComplete Event

问题描述

我最近在 ASP.Net Ajax 控件工具包的最新版本 (3.0.40412) 中遇到了 AsyncFileUpload 控件.在稍后显示的隐藏控件中使用它时似乎存在问题，例如带有 visible=false 的

标记.

示例:

页面代码 -

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="act" %>...<act:ToolkitScriptManager runat="server" ID="ScriptManager1"/><asp:UpdatePanel runat="server" ID="upnlFileUpload"><内容模板><asp:Button runat="server" ID="btnShowUpload" Text="显示上传"/><div runat="server" id="divUpload"visible="false"><act:AsyncFileUpload runat="server" id="ctlFileUpload"/>

</内容模板></asp:UpdatePanel>

服务端代码 -

Protected Sub ctlFileUpload_UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) 处理 ctlFileUpload.UploadedComplete结束子Protected Sub btnShowUpload_Click(ByVal sender As Object, ByVal e As System.EventArgs) 处理 btnShowUpload.C​​lickdivUpload.Visible = True结束子

我在 UploadedComplete 事件上有一个断点，但它永远不会触发.但是，如果您从 <div> 中取出 AsyncFileUpload 控件，使其在初始页面呈现时可见，则该控件会按预期工作.

那么，这是 AsynchUploadControl 中的错误，还是我没有掌握基本概念(经常发生)?

解决方案

首先，确保你的标签具有以下属性 - enctype="multipart/form-data" method="post" 其次，您必须将 AsyncFileUpload 放在可见 DIV 内的不可见 DIV 中.看到这两个线程就可以了.

http://forums.asp.net/t/1489399.aspx

http://forums.asp.net/t/1479689.aspx?PageIndex=2

I recently came across the AsyncFileUpload control in the latest (3.0.40412) release of the ASP.Net Ajax Control Toolkit. There appears to be an issue when using it in a hidden control that is later revealed, such as a <div> tag with visible=false.

Example:

Page code -

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="act" %>
.
.
.
<act:ToolkitScriptManager runat="server" ID="ScriptManager1" />
<asp:UpdatePanel runat="server" ID="upnlFileUpload">
    <ContentTemplate>
        <asp:Button runat="server" ID="btnShowUpload" Text="Show Upload" />
        <div runat="server" id="divUpload" visible="false">
            <act:AsyncFileUpload runat="server" id="ctlFileUpload" />
        </div>
    </ContentTemplate>
</asp:UpdatePanel>

Server-side Code -

Protected Sub ctlFileUpload_UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles ctlFileUpload.UploadedComplete

End Sub

Protected Sub btnShowUpload_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnShowUpload.Click
    divUpload.Visible = True
End Sub

I have a breakpoint on the UploadedComplete event but it never fires. However, if you take the AsyncFileUpload control out of the <div>, making it visible at initial page render, the control works as expected.

So, is this a bug within the AsynchUploadControl, or am I not grasping a fundamental concept (which happens regularly)?

解决方案

First, make sure your tag has the following attribuytes - enctype="multipart/form-data" method="post" Secondly, you have to have the AsyncFileUpload in an invisible DIV within a visible DIV. See these two threads on it.

http://forums.asp.net/t/1489399.aspx

http://forums.asp.net/t/1479689.aspx?PageIndex=2

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