如何檢查是否有目錄存在不知道具體的目錄名，而僅僅是文件夾，該文件夾可能是

Question

在vb.net你如何檢查是否一個目錄中存在的任何目錄

我會需要知道c：\ windows目錄中是否有文件夾（不知道是否有ANY目錄）。

Answer 1

所以你想檢查目錄中是否有子目錄？足夠公平：

Dim hasSubDirectories as Boolean = My.Computer.FileSystem.GetDirectories(parentDir).Count > 0 

Answer 2

您可以在System.IO名稱空間內使用DirectoryInfo類。

實施例：

Dim path As String = "C:\Windows" 
    Dim directoryInfo As New DirectoryInfo(path) 

    Dim dirInfos() As DirectoryInfo = directoryInfo.GetDirectories() 

    If (dirInfos.Length > 0) Then 
     ' you have directories, do what you want 
    End If 

    'or iterate over directories 

    For Each dirInfo As DirectoryInfo In dirInfos 
     ' do something with each directory 
    Next 

Answer 3

而不是使用特定的VB-功能等mattbasta所暗示的，它只是爲便於使用System.IO.Directory類，這是BCL的一部分，並且將是熟悉的任何其他.NET開發商。

Dim hasSubDirectories = System.IO.Directory.GetDirectories(parentPath).Length > 0 

Answer 4

問題是，我不能轉換爲字符串

Dim path As String = "..\..\..\Tier1 downloads\CourseVB\" 


    If countNumberOfFolders > 0 Then 'if there is a folder then 


     ' make a reference to a directory 
     Dim di As New IO.DirectoryInfo(path) 
     Dim diar1 As IO.DirectoryInfo() = di.GetDirectories() 
     Dim dra As IO.DirectoryInfo 

     'list the names of all files in the specified directory 
     For Each dra In diar1 

      Dim lessonDirectoryName() As Lesson 
      lessonDirectoryName(0).lessonName = dra 

     Next 

「的課程是一個對象，並且lessonName是字符串類型的屬性。我如何將directoryInfo轉換爲字符串？