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remove duplicate elements from a Generic list

Posted on 2011-03-14
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Last Modified: 2012-05-11
Hello,
  I have function that should query a directory and return files that match a pattern. However, the list contain duplicate elements. How do I remove duplicate element from list<string>

e,g searchPattern = cap|cap.gz
file = f1.cap, f2.cap.gz
* The code below will add the files twice

Public Function GetFilesByExtension(ByVal dir As String, ByVal searchPattern As String) As String()
    Dim filelist As New List(Of String)
    Dim m_arExt() As String = Split(searchPattern, "|")
     For Each FileExt As String In m_arExt
            filelist.AddRange((IO.Directory.GetFiles(dir, FileExt)))
        Next
return Return filelist.ToArray
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Question by:SiemensSEN
2 Comments
 
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Craig Wagner earned 100 total points
ID: 35134388
It seems like the simplest solution would be to avoid adding the duplicates in the first place.
For Each FileExt As String In m_arExt
            For Each file As String In IO.Directory.GetFiles(Dir, FileExt)
                If Not filelist.Contains(file) Then
                    filelist.Add(file)
                End If
            Next
        Next

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Assisted Solution

by:Russell_Venable
Russell_Venable earned 25 total points
ID: 35138753
Why not use a dictionary or use linq's distinct function?
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