how to check for duplicate values in listview vb.net

Question

How do i control entry of a record to a listview if it creates duplication,not to a database of course.It checks all the items in the listview including the subitems and then notifies the user that there is a reocrd in the listview if there exists,otherwise recorded I still can't the right code.

Can you help me out please?

Karl Anderson · Accepted Answer · 2013-11-11 13:02:22Z

1

Either bind to a collection that does not allow duplicates (i.e. HashSet) or loop through the entire list of items before adding to see if the item already exists. I recommend the HashSet route, as it will return False if you try to add a duplicate item to the collection, thus your code for adding is simplified to this:

If hashSet.Add(yourNewValue) Then
    ' Succesfully added
Else
    ' Value already exists, add did not happen
End If

answered Nov 11, 2013 at 13:02

Karl Anderson

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1 Comment

Pacane Over a year ago

And, it's faster than looping through the entire list.

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