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我希望有人会回应。我有一个控件,它有一个更新面板(设置为条件更新),其中有一个 asyncfileupload 控件。控件起初工作正常,但如果我上传文件,然后导致其更新面板更新,则 asyncfileupload.UploadedFileError 将在没有它或 asyncFileUpload.UploadedComplete 被调用的情况下触发。这是我创建控件的方式:

Public Class FileUpload
    Inherits ScriptControl
    Implements INamingContainer, IPostBackEventHandler
    Private WithEvents asyncFileUpload As AjaxControlToolkit.AsyncFileUpload
....

 asyncFileUpload = New AjaxControlToolkit.AsyncFileUpload
 With asyncFileUpload
    .ClientIDMode = UI.ClientIDMode.AutoID
    .UploadingBackColor = ColorTranslator.FromHtml(UploadingBackColor)
    .CompleteBackColor = ColorTranslator.FromHtml(CompleteBackColor)
    .UploaderStyle = AjaxControlToolkit.AsyncFileUpload.UploaderStyleEnum.Traditional
    .ThrobberID = img.UniqueID
 End With
'then the control gets added to a Panel.  
'events:
Protected Sub fileUploadFailure(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles asyncFileUpload.UploadedFileError

'do stuff
end Sub

 Protected Sub SaveUploadedFile(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles asyncFileUpload.UploadedComplete

'do stuff
End Sub

正如我所提到的,该控件在上传文件时工作正常。但是我在同一个控件中有一个链接按钮,允许用户下载上传的文件(导致控件的更新面板更新)。发生这种情况时,fileUploadFailure 事件会无缘无故地触发(因为没有进行上传)。谁能解释发生了什么以及如何防止这种情况?

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1 回答 1

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在使用了一段时间后,我意识到如果我用来开始下载的按钮是链接按钮,这似乎是一个问题。如果我将其更改为按钮,那很好。

于 2013-07-25T15:37:36.857 回答