ArrayList concepet

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Hi guys,

I am Nagarajan a software solution developer. I have one doubt.
I am using a data grid control, and retrieved email textbox item, and stored it into the array list.
How can I delete duplicate elements in the array list?
I'm using ASP.net and C#.
Kindly look at this and reply.

Thank you!

Regards,

Nagarajan P.

Posted 23-Dec-10 4:42am

nagarajapdotnet

Updated 23-Dec-10 4:48am

Manfred Rudolf Bihy

v4

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Manfred Rudolf Bihy 23-Dec-10 10:47am

Edited for spelling and grammar.

3 solutions

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#realJSOP · Answer 1 · 2010-12-23T05:32:00

Solution 4

Create an extension method called AddIfUnique. This extension method would do the uniqueness check for you, and all you have to do is pass in the data you want to add. I do this kind of thing all the time.

Posted 23-Dec-10 5:32am

#realJSOP

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Manfred Rudolf Bihy 23-Dec-10 11:43am

Dang! I should have noticed that! He didn't mention the .NET version though he's using. Still... +5

Manfred Rudolf Bihy · Answer 2 · 2010-12-23T04:54:00

Hi Nagarajan,

when you are adding the elements to the ArrayList call the method Contains to check if that element is already in the list. Add the element to said ArrayList only if it is not contained in the list. See my example code below:

C#

pulic bool function AddIfNotContained(Object element, ArrayList list)
{
    bool wasAdded = false;
    if(!list.Contains(element))
    {
        list.Add(element);
        wasAdded = true;
    }
    return wasAdded;
}

That should solve your problem.

Regards,

Manfred

Dylan Morley · Answer 3 · 2010-12-23T04:59:00

Solution 3

Why not stop the problem at the source by not allowing duplicates in the Array in the first list?

Otherwise, lots of different solutions here

http://stackoverflow.com/questions/9673/remove-duplicates-from-array[^]

The HashSet example is nice, depends if you're on >= .Net 3.5

Posted 23-Dec-10 4:59am

Dylan Morley