String() variable in VB

Question

I'm trying to modify a program where there is a variable that stores all the specified file types in a String() variable. What I would like to do is to somehow append to this variable in any way if I want to search another directory or just grab another individual file. Any suggestions would be greatly appreciated.

//Grab files from a directory with the *.txt or *.log as specified in the Combo Box
Dim strFiles As String()
strFiles = System.IO.Directory.GetFiles(txtSource.Text, cmbtype.SelectedItem, IO.SearchOption.AllDirectories)

EDIT: Edited to include code snippet used.

Dim strFiles As String()
Dim listFiles As List(Of String)(strFiles)

If (cmbtype.SelectedItem = "All") Then
    //Do stuff

     For index As Integer = 1 To cmbtype.Items.Count - 1
         Dim strFileTypes As String() = System.IO.Directory.GetFiles(txtSource.Text, cmbtype.Items(index), IO.SearchOption.AllDirectories)
     Next

    //Exit Sub
Else
    listFiles.Add(System.IO.Directory.GetFiles(txtSource.Text, cmbtype.SelectedItem, IO.SearchOption.AllDirectories).ToString())
End If

Joel Coehoorn · Accepted Answer · 2012-04-24 17:08:16Z

3

Right now you're using a String() which is an array of String instances. Arrays are not well suited for dynamically growing structures. A much better type is List(Of String). It is used in very similar manners to a String() but has a handy Add and AddRange method for appending data to the end.

Dim strFiles As New List(Of String)()
strFiles.AddRange(System.IO.Directory.GetFiles(txtSource.Text, cmbtype.SelectedItem, I

O.SearchOption.AllDirectories)

edited Apr 24, 2012 at 17:08

Joel Coehoorn

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answered Aug 24, 2010 at 15:27

JaredPar

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Comments

asawyer · Accepted Answer · 2010-08-24 13:15:58Z

1

dim listFiles as list(of string)
listFiles = System.IO.Directory.GetFiles(txtSource.Text, cmbtype.SelectedItem, IO.SearchOption.AllDirectories).ToList()
listFiles.Add("..\blah\...\")

answered Aug 24, 2010 at 13:15

asawyer

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6 Comments

Neil Knight Over a year ago

+1: I was just typing something similar and then it popped up 1 new answer.

Seb Over a year ago

I don't see a .ToList() option.

asawyer Over a year ago

do you have Import System.Linq ?

asawyer Over a year ago

I suppose if your using .Net 2.0 that wouldn't work. Luckly List(of T) will take an array in a constructor overload. Dim strFiles As String() strFiles = System.IO.Directory.GetFiles(txtSource.Text, cmbtype.SelectedItem, IO.SearchOption.AllDirectories) dim listOfFiles as new list(of string)(strFiles) listOfFiles.Add("..\file\..")

Seb Over a year ago

Tried to do that, but got an error about 'array bounds cannot be in type specifiers'. I'm trying to do this in Visual Studio 2008 with .Net 3.5

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