2017-08-07 170 views
0

我想創建一個程序,根據輸入和與數據庫的匹配來創建一堆文件夾。 一切正常,但我想以編程方式仔細檢查是否創建了正確數量的文件夾。設置VB.NET事件的優先級

Private Sub CreateButton_Click(sender As Object, e As EventArgs) Handles CreateButton.Click 
    Dim rows As DataRow() 
    rows = dTable.Select(String.Format("[Pick List ID] = '{0}'", PLTextBox.Text)) 
    Dim sourcePath As String = "" 
    Dim destPath As String = "" 

    If rows.Count > 0 And PLTextBox.Text <> "" Then 

     ' Some variable i want to use to count the number of folders created. 
     folderCount = 0 

     For Each row As DataRow In rows 
      Try 

      ...  
      some logic to specify what the sourcePath and destPath will be 
      ... 
       ' Checking if the directory exists 
       If Not (Directory.Exists(destPath)) Then 
        Directory.CreateDirectory(destPath) 
       End If 

       ' Copy pasting source directory into newly created folder 
       FileIO.FileSystem.CopyDirectory(sourcePath, destPath) 

      Catch ex As Exception 
       MsgBox("Error: " & ex.Message,, "Something went wrong...") 
      End Try 
     Next 

所以在這裏,一旦我的所有文件夾的創建,我想驗證正確的數字被創造了,所以在同一子,我有:

RaiseEvent CreationDone(sender, e) 

End Sub 

要算我的文件夾中,我使用:

Private Sub FSWatcher_Created(sender As Object, e As FileSystemEventArgs) Handles FSWatcher.Created 
     folderCount = folderCount + 1 
    End Sub 

而且CreationDone事件是:

Private Sub Creation_Done() Handles Me.CreationDone 
     Dim rows As DataRow() = dTable.Select(String.Format("[Pick List ID] = '{0}'", PLTextBox.Text)) 
    If folderCount <> rows.Count Then 
     MsgBox(folderCount & " folders were created. " & rows.Count & " were supposed to be created.",, "Error during the folder creation") 

    Else 
     MsgBox(rows.Count & " jobs were created",, "Success!") 
    End If 
End Sub 

並執行以下操作: 我CreateButton_Click處理程序運行時,它提出了在年底CreationDone事件,但沒有更新的文件夾數,因爲我FileSystemWatcher事件是由FSWatcher_CreatedCreateButton_Click執行完畢後處理(所以FOLDERCOUNT仍爲0)。

我試圖用一個事件來執行檢查到該事件的順序上升和處理將是

  • CreateButton_Click運行

對於i = 1到x的文件夾來創建

  • 1文件夾中創建
  • FSWatcher提高1 「創建」 事件

下一個

  • CreationDone事件引發
  • CreateButton_Click結束
  • X FSWatcher.Created事件的處理
  • CreationDone的處理

但creationdone在獲得優先權文件系統事件。

我該如何解決這個問題?

有趣的發現(編輯):當有在文件夾複製過程thown異常,FOLDERCOUNT正常遞增,所以異常都讓FSWatcher引發事件和/或我的代碼處理它們。我是否應故意拋出異常以使其正常工作? (或者只是在我顯示msgBox來顯示錯誤時執行)

謝謝。

+0

不幸的是,你不能設置事件優先級,據我知道。您應該更好地記錄代碼運行時應創建的文件夾的名稱,並在完成之後驗證它們是否存在。這比使用FileSystemWatcher要好,因爲如果您處於可以在其他線程中創建其他文件夾的多線程環境中,則有可能發生這種情況。 –

+0

謝謝,我只是檢查目錄不存在 - 創建它 - 檢查目錄存在:) – Ali

回答

1

不知道你的代碼,如果你想只得到文件夾的數量爲特定的目錄,你可以這樣做:

Dim folderCount as Integer = Directory.GetDirectories("YourPathway").Length