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VBA - classes and structures videos | Excel VBA Part 37 - Custom Collections
Posted by Andrew Gould on 27 October 2014
Excel VBA is full of collections and you can even create your own custom collections using the Collection object. This video teaches you how to create a new custom collection, how to add items to it, how to reference those items individually and how to loop over all of the items in the collection. You'll also see how you can add items based on a custom class module to a collection.
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I came across this code from another website:
These lines are in the class collectionExt:
Public Function Clone() As collectionExt
Dim newColl As New collectionExt
' some more code
End Function
It seems inside the function, it is decalring an instance of itself. How come it's not recursive?
Hi duggie!
It would be recursive if the Clone function called itself. Or if the Initialize event of the class called the Clone function. Or if the Initialize event of the class created a new instance of itself.
As it is, the Clone function creates one new instance of the class each time the Clone function is called.
I hope it helps!
Andrew,
Thanks for explaining. Wasn't sure initially what you meant by the "Zone" function but then I realised it must've been a typo.
Oops! Yes, my mistake, I've corrected it now, thanks for pointing it out!
This code removes all rows if column E contains Oranges
Dim DataArray() As Variant
DataArray() = Sheet1.Cells(1, 1).CurrentRegion.Value
Dim DataArrayRows As Long
DataArrayRows = UBound(DataArray(), 1)
Dim DataArrayCols As Long
DataArrayCols = UBound(DataArray(), 2)
Dim SubArray() As Variant
ReDim SubArray(1 To DataArrayRows, 1 To DataArrayCols) As Variant
Dim I As Long, j As Long, k As Long
j = 1
k = 1
For i = 2 To DataArrayRows
If DataArray(i, 5) <> "Oranges" Then
For j = 1 To DataArrayCols
SubArray(k, j) = DataArray(i, j)
Next j
k = k + 1
End If
Next I
Sheet3.Cells(2, 1).Resize(k - 1, DataArrayCols).Value = SubArray()
but I've had to declare a large SubArray, as big as the original array.
ReDim SubArray(1 To DataArrayRows, 1 To DataArrayCols) As Variant
Is it possible to use collections to "add-on-the-fly"?
Dim DataArray() As Variant
DataArray() = Sheet1.Cells(1, 1).CurrentRegion.Value
Dim DataArrayRows As Long
DataArrayRows = UBound(DataArray(), 1)
Dim DataArrayCols As Long
DataArrayCols = UBound(DataArray(), 2)
Dim SubArray() As Variant
ReDim SubArray(1 To DataArrayRows, 1 To DataArrayCols) As Variant
Dim I As Long, j As Long, k As Long
j = 1
k = 1
Dim Coll1 As Collection
Dim Coll2 As Collection
Dim Coll3 As Collection
Dim Coll4 As Collection
Dim Coll5 As Collection
Dim Coll6 As Collection
Dim Coll7 As Collection
Dim Coll8 As Collection
Dim Coll9 As Collection
Dim Coll10 As Collection
Set Coll1 = New Collection
Set Coll2 = New Collection
Set Coll3 = New Collection
Set Coll4 = New Collection
Set Coll5 = New Collection
Set Coll6 = New Collection
Set Coll7 = New Collection
Set Coll8 = New Collection
Set Coll9 = New Collection
Set Coll10 = New Collection
For i = 2 To DataArrayCols
If DataArray(i, 12) <> "RD" Then
Coll1.Add DataArray(i, 1)
Coll2.Add DataArray(i, 2)
Coll3.Add DataArray(i, 3)
Coll4.Add DataArray(i, 4)
Coll5.Add DataArray(i, 5)
Coll6.Add DataArray(i, 6)
Coll7.Add DataArray(i, 7)
Coll8.Add DataArray(i, 8)
Coll9.Add DataArray(i, 9)
Coll10.Add DataArray(i, 10)
k = k + 1
End If
Next i
Sheet3.Cells(2, 1).Resize(k - 1, DataArrayCols).Value = SubArray()
but it seems cumbersome.
How can I use a collection without having to declare it many times?
I don't think that a collection will help you here. Regardless of how you populate it, you won't be able to write its contents into a range of cells in a single step in the same way you can with an array. You would have to loop over the collection after you have populated it and write out its contents one-by-one.
For the sake of interest, you could use a single collection as shown below:
Sub PopulateCollection()
Dim DataArray
Dim DataArrayRows As Long
Dim DataArrayCols As Long
Dim i As Long, j As Long
Dim Coll1 As Collection
DataArray = Sheet1.Cells(1, 1).CurrentRegion
DataArrayRows = UBound(DataArray, 1)
DataArrayCols = UBound(DataArray, 2)
Set Coll1 = New Collection
'Loop through array and add matching values to collection
For i = 2 To DataArrayRows
If DataArray(i, 12) <> "RD" Then
For j = 1 To DataArrayCols
Coll1.Add Item:=DataArray(i, j)
Next j
End If
Next i
'Loop through collection and list its values
Dim v As Variant
For Each v In Coll1
Debug.Print v
Next v
End Sub
You may also be interested in this post which talks about ways to create a key for each item in the collection https://stackoverflow.com/questions/5702362/vba-collection-list-of-keys
I hope that helps!
Thanks, greatly appreciated.
No problem!