CODEWITHSUNDEEP
vb.net
fedeteka
fedeteka

Reputation: 963

How to check if 2 listbox have the same items collection?

I load items from a database on lstData then I make a copy of this state on another listbox called lstOriginal using this code

lstOriginal.Items.Clear()
    For Each Item In lstData.Items
        lstOriginal.Items.Add(Item)
    Next

Then the user is available to make changes, add or delete items on lstData and when the user press UPDATE I need to know if the items collection of lstData and lstOriginal are the same.

I don´t care about what changed, if there's a difference I will update the complete items collection on the data base.

So I need to know if the items collection of lstData and lstOriginal are the same.

The only way I know is make a loop like

Dim lstOriginalString as String
lstOriginalString = ""
For Each Item In lstOriginal.Items
        lstOriginalString = lstOriginalString & Item
Next

Then another loop for lstData and a simple string compare, but I think there's gonna be a simpler way

Upvotes: 0

Views: 229

Answers (1)

Tim Schmelter
Tim Schmelter

Reputation: 460098

You could use LINQ:

Dim isSame As Boolean = lstData.Items.Count = lstOriginal.Items.Count
If isSame Then
   Dim newItems = lstData.Items.Cast(Of String)()
   Dim originalItems = lstOriginal.Items.Cast(Of String)()
   isSame = Not newItems.Except(originalItems).Any()
End If

If you wanted to know if it's even in the same order:

isSame = newItems.SequenceEqual(originalItems)

Upvotes: 1

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