Question

Compare arrays of different sizes

Asked by: daJman

I'm sure there is something very wrong with my thinking but I can't see it.

I'm trying to compare 2 arraylists of different sizes with:

            If array1.Count > array2.Count Then
                For i As Integer = 0 To array1.Count - 1
                    For x As Integer = 0 To array2.Count - 1
                        If array2.Item(x).ToString = array1.Item(i).ToString Then
                            array1.RemoveAt(i)
                            array1.RemoveAt(i)
                        End If
                    Next
                Next
          End if

It actually works well but I get errors:
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index at System.Collections.ArrayList.get_Item(Int32 index) ...

Where is my problem?

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Asked On
2008-09-10 at 19:57:55ID23721653
Tags

vb.net

Topic

Microsoft Visual Basic.Net

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: TheLearnedOnePosted on 2008-09-10 at 20:07:48ID: 22445702

This is a typical problem with VB.NET.  The ending condition for the VB.NET is not re-evaluated after each iteration, it is only evaluated once, at the beginning of the For loop.

 

by: Arthur_WoodPosted on 2008-09-10 at 20:22:26ID: 22445862

as you remove entries from the array, the position of remaining entries changes (the ones AFTER the remove item, all 'move up'), so you need to remove items in 'reverse order:

AW

            If array1.Count > array2.Count Then
                For i As Integer = array1.Count - 1 To 0 step - 1
                    For x As Integer = array2.Count - 1 To 0 step -1
                        If array2.Item(x).ToString = array1.Item(i).ToString Then
                            array1.RemoveAt(i)
                            Exit For ' since you already found the matching item for this iteration
                        End If
                    Next
                Next
          End if

                                              
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by: daJmanPosted on 2008-09-10 at 21:05:40ID: 31495390

Nice, it works. Thanks Arthur. I figured it was something simple.

TLO - I have been meaning to read that C# book eventually...

Thanks guys.

 

by: Arthur_WoodPosted on 2008-09-11 at 04:10:56ID: 22448366

Glad to be of assistance.

AW

20120131-EE-VQP-002

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