Asp.net AjaxControlToolkit异步文件上载程序工作不正常

我的页面上有一个AsynchFileUpload，由于某种原因，当我试图使用它将文件保存到服务器时，它会掉下来

控件将允许我在本地选择一个文件，并在其文本框中显示本地文件路径，但当我单击页面上的一个按钮时，我将使用该按钮提交所有详细信息，然后上载页面，所有内容都出错，我从AsynchFileUploader获得一个Null Ref异常

我的上传程序相当基本，看起来像：

   <cc1:AsyncFileUpload runat="server" 
                                  ID="AsyncFileUpload2" 
                                  Enabled="true" 
                                  Visible="true"/>

单击按钮后，文件名似乎在某个地方丢失，或者从未存储过，请执行以下操作解决此问题：

Private Sub AsyncFileUpload1_UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles AsyncFileUpload1.UploadedComplete
      If e.State = AjaxControlToolkit.AsyncFileUploadState.Success Then

         Dim ticketID As String = Request.QueryString("ID").ToString()
         Dim filename As String = e.FileName

         Dim temp() As String = filename.Split("\")
         filename = temp(temp.Length - 1)


         Dim NewDirectory As String = Server.MapPath("~/Helpdesk/UploadedFiles/" + ticketID + "/")

         'Check if directory exists
         If Not Directory.Exists(NewDirectory) Then

            ' Create the directory.
            Directory.CreateDirectory(NewDirectory)

         End If

         ' Save the file on the server
         AsyncFileUpload1.SaveAs(NewDirectory + filename)

         'Now put the file details in the database
         dbSaveFile(ticketID, filename, "UploadedFiles/" + ticketID + "/" + filename, "")

         'Raise some kind of notification informing the user that this has been sucessfull



         'And rebind the control
         ' Get Event Details and populate text fields
         Dim dsFiles As DataSet = dbGetFiles(ticketID)

         If dsFiles Is Nothing Then
            ' No need to error here if we have no files
         Else
            gvFiles.DataSource = dbGetFiles(ticketID)
            gvFiles.DataBind()

         End If

      Else
         ' Do nothing
      End If
   End Sub

---

看看我对一个类似问题的回答，看看它是否有用：谢谢，我以前看过这个问题，我想我对这个控件的工作原理有点困惑，因为我认为UploadedComplete事件在我真正上传文件之前不会触发，因为我没有指定文件路径或调用AsyncFileUpload2.SaveAs（）方法，但我并不期望uploadedcomplete事件被触发。文件是否在用户选择后立即上传？我认为您将上传到服务器和保存到服务器混合在一起。当用户在其PC上选择该文件时，该文件将立即发送到服务器。在UploadedComplete中，您可以决定mime类型是否正确，最后您可以将其物理保存在服务器上的某个位置。啊，这很有意义。我错误地假设控件只允许我在客户端选择一个文件，并且当我调用save方法时，上传和保存将同时完成，这显然不是这里的情况。谢谢你的帮助

Private Sub AsyncFileUpload1_UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles AsyncFileUpload1.UploadedComplete
      If e.State = AjaxControlToolkit.AsyncFileUploadState.Success Then

         Dim ticketID As String = Request.QueryString("ID").ToString()
         Dim filename As String = e.FileName

         Dim temp() As String = filename.Split("\")
         filename = temp(temp.Length - 1)


         Dim NewDirectory As String = Server.MapPath("~/Helpdesk/UploadedFiles/" + ticketID + "/")

         'Check if directory exists
         If Not Directory.Exists(NewDirectory) Then

            ' Create the directory.
            Directory.CreateDirectory(NewDirectory)

         End If

         ' Save the file on the server
         AsyncFileUpload1.SaveAs(NewDirectory + filename)

         'Now put the file details in the database
         dbSaveFile(ticketID, filename, "UploadedFiles/" + ticketID + "/" + filename, "")

         'Raise some kind of notification informing the user that this has been sucessfull



         'And rebind the control
         ' Get Event Details and populate text fields
         Dim dsFiles As DataSet = dbGetFiles(ticketID)

         If dsFiles Is Nothing Then
            ' No need to error here if we have no files
         Else
            gvFiles.DataSource = dbGetFiles(ticketID)
            gvFiles.DataBind()

         End If

      Else
         ' Do nothing
      End If
   End Sub