问题
Referring to the following: Ajax Asyncfileupload doesn't work as soon as I put it in a control
I am having the same issue. I am not using a Master page though. I have an AsyncFileUpload control in a Panel, within an update panel.
Any ideas as to what could be causing the issue?
回答1:
When you use AsyncFileUpload you must set the right params in the form tag, that is placed in your Page or MasterPage:
<form id="form1" runat="server" enctype="multipart/form-data" method="post">
If you don't set the right enctype and method UploadedComplete will never fire, and you won't be able to get FileUpload.FileBytes since FileUpload.HasFile returns true only during UploadedComplete execution.
I suppose that in your page you haven't set the right enctype.
Besides, prevoius versions of AsyncFileUpload didn't work on Chrome. 2011 July version (4.1.50731.0) solved the problem.
来源：https://stackoverflow.com/questions/3561106/ajax-toolkit-asyncfileupload-not-working-inside-a-normal-panel