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How to Check Whether an Array Is Empty

Posted on 2009-04-10
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Last Modified: 2013-12-25
In the code below, strFileList is a array of file names (strings).

I want to be sure the array is not empty before I run the File Delete portion of the code.  

Will the method below work for skipping the File Delete portion if there are no values in the array?  

Is there a better way to check to see if the array is empty.
Dim strFileList As String()
        Dim strFileName As String
 
        Dim intFileListItemCount As Integer = 0
 
        If Directory.Exists(strBackupPath) = True Then
 
            strFileList = Directory.GetFiles(strBackupPath, "*.bak")
 
            For Each strFileName In strFileList
                intFileListItemCount = intFileListItemCount + 1
            Next
 
            If intFileListItemCount > 0 Then
                For Each strFileName In strFileList
                    File.Delete(strFileName)
                Next
 
                Return True
            Else
                Return False
 
            End If
        Else 'Directory does not exist
            Return False
        End If

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Question by:TimSledge
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4 Comments
 
LVL 48

Accepted Solution

by:
jpaulino earned 400 total points
ID: 24120212
You can check the Length of the array that gives you the number of elements you have

        If strFileName.Length = 0 Then
            Stop ' array is empty
        End If

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0
 
LVL 47

Assisted Solution

by:Wayne Taylor (webtubbs)
Wayne Taylor (webtubbs) earned 100 total points
ID: 24120256
I believe that should be...

    strFileList.Length = 0

Wayne
        Dim strFileList As String()
        Dim strFileName As String
  
        If Directory.Exists(strBackupPath) = True Then
             strFileList = Directory.GetFiles(strBackupPath, "*.bak") 
            If strFileList.Length > 0 Then
                For Each strFileName In strFileList
                    File.Delete(strFileName)
                Next 
                Return True
            Else
                Return False 
            End If
        Else 'Directory does not exist
            Return False
        End If

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0
 
LVL 48

Expert Comment

by:jpaulino
ID: 24120262
>> I believe that should be...
It was a typo :)
0
 
LVL 4

Author Comment

by:TimSledge
ID: 24120812
Thanks for your help!
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