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arraylist comparison

Posted on 2011-09-09
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Last Modified: 2012-05-12
I had an arraylist with values

DOCX
DOC
DOCX
DOC
DOC
DOC

I want to check whether all the values in the arraylist are equal or not

here the arraylsit values are different (4 DOC 2 DOCX) if different i want to set a flag to false
else set flag to true.

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Question by:shragi
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3 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 36513756
It should be something along the lines of:
Dim baseLine As String = yourArrayList(0).ToString()
Dim allEqual As Boolean = True

For Each item In yourArrayList
    If item.ToString() <> baseLine Then
        allEqual = False
        Exit For
    End If
Next

If allEqual Then
    MessageBox.Show("All items are equal")
Else
    MessageBox.Show("All items are NOT equal")
End If

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LVL 19

Accepted Solution

by:
Shahan Ayyub earned 500 total points
ID: 36513961
Hi!

Have a look at this way:

            bool IsEqual=false;
            ArrayList elements = new ArrayList(new object[] { "DOC", "DOC", "DOC", "DOC", "DOC", "DOC" });
            elements.Sort();
            if (elements[elements.Count - 1] == elements[0])  
                IsEqual = true;

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LVL 19

Assisted Solution

by:Shahan Ayyub
Shahan Ayyub earned 500 total points
ID: 36514038
If you can use LINQ you should look at Distinct() and Count() methods. That would be even more shorter than my previous solution.

This link may help you on that: (where most of the LINQ examples are given)
http://msdn.microsoft.com/en-us/vbasic/bb688085

VB.Net version of my previous solution:
Dim IsEqual As Boolean = False
Dim elements As New ArrayList(New Object() {"DOC", "DOC", "DOC", "DOC", "DOC", "DOC"})
elements.Sort()
If elements(elements.Count - 1) = elements(0) Then
	IsEqual = True
End If

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