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Listbox sorting numerically

Posted on 2004-08-17
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Last Modified: 2008-03-06
I am loading files from a directory into a Listbox using this:

Dim en As IEnumerator = OD1.FileNames.GetEnumerator
While en.MoveNext
    ListBox1.Items.Add(Dir(en.Current))
End While

The file are named as such;  1x-111xx-1-1yy-5.toc.htm
I am needing to sort the files using the number after the yy-.  As 1,2,3,...9,10,11;  Right now sort is sorting alphabetically.

Any help on this wiuld be great, thanks.
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Question by:JHalstead
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6 Comments
 
LVL 25

Expert Comment

by:RonaldBiemans
ID: 11821891
you could try something like this. (it's not brilliant code (redim) but it works and should give you a general idea)

dim str() as string
dim int() as integer
dim x as integer = 0
Dim en As IEnumerator = OD1.FileNames.GetEnumerator
While en.MoveNext
  redim str(str.getupperbound(0) + 1)
  redim int(int.getupperbound(0) + 1)
  str(x) =  dir(en.current))
  int(x) = Val(str(x).Substring(str(x).IndexOf("yy-") + 3, str(x).IndexOf(".") - (str(x).IndexOf("yy-") + 3)))
  x += 1
End While

str.Sort(int, str)

For Each g As String In str
     ListBox1.Items.Add(g)
Next
0
 

Author Comment

by:JHalstead
ID: 11822041
Object reference not set to an instance of an object.  Occured on the first ReDim statemt.  str=nothing
0
 
LVL 25

Expert Comment

by:RonaldBiemans
ID: 11822080
oeps, sorry

dim str(0) as string
dim int(0) as integer
0
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Author Comment

by:JHalstead
ID: 11822202
Hi, I'm sorry to waist your time, but I got the answer from another post.  ICompare!!

Dim ar As New ArrayList(OD1.FileNames)
        ar.Sort(New MySorter)
        ListBox1.Items.AddRange(ar.ToArray())



    Private Class MySorter
        Implements IComparer


        Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer Implements System.Collections.IComparer.Compare
            Dim s1 As String = x
            Dim s2 As String = y
            Try
                Dim i1 As Integer = s1.IndexOf("."c)
                Dim j1 As Integer = s1.LastIndexOf("-"c, i1)
                Dim n1 As Integer = Integer.Parse(s1.Substring(j1 + 1, i1 - j1 - 1))

                Dim i2 As Integer = s2.IndexOf("."c)
                Dim j2 As Integer = s2.LastIndexOf("-"c, i2)
                Dim n2 As Integer = Integer.Parse(s2.Substring(j2 + 1, i2 - j2 - 1))

                Return n1 - n2
            Catch ex As Exception
                Return String.Compare(s1, s2, True)
            End Try
        End Function
    End Class
0
 
LVL 25

Expert Comment

by:RonaldBiemans
ID: 11822222
No problem, go to community service and get your points refunded
0
 
LVL 2

Accepted Solution

by:
Lunchy earned 0 total points
ID: 11824385
Closed, 125 points refunded.
Lunchy
Friendly Neighbourhood Community Support Admin
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