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Create arraylists dynamically based on loop

Posted on 2010-09-07
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Last Modified: 2012-05-10
I have a textbox with some text in it. I have a loop that retrieves bits of the text based on a regular expression and stores it in a listbox.
I then have a second loop which takes each value in this listbox and retrieves bits of the text in the textbox with a regular expression based on each value from the first listbox, and stores all of it in another listbox.
I would like to create an array list for each value in the first listbox which stores the retrieved bit of text for that value from the second loop.
I guess the question is about how to create a number of new arraylists programmatically based on how many items are in a listbox...... (in vb.net)

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Question by:sebastiz
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Expert Comment

by:Wayne Taylor (webtubbs)
ID: 33616175
ArrayLists are resizable, so you don't need to know how many items it will hold.

http://msdn.microsoft.com/en-us/library/system.collections.arraylist.aspx

Wayne
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Wayne Taylor (webtubbs) earned 2000 total points
ID: 33616190
Might have misread what you are doing.

Sounds like you could use a List of ArrayLists....

    Dim ArrayLists As New List(Of ArrayList)
    For 'whatever your loop is
        Dim arr As New ArrayList()
        'add items to arr
        ArrayLists.Add(arr)
    Next

Wayne
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Author Comment

by:sebastiz
ID: 33616212
Great. How do I then reference the arraylist within the arraylist. Lets say I then want to loop through the second arrayllist in the parent arraylist?
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Assisted Solution

by:Wayne Taylor (webtubbs)
Wayne Taylor (webtubbs) earned 2000 total points
ID: 33616439
Simply by index (zero based)...

    Dim arr2 As ArrayList = ArrayLists(1)

Wayne
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Author Comment

by:sebastiz
ID: 33616850
Brilliant. Many thanks
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