问题
I have seen some discussion around this, but I am still puzzled by this error:
Only User-defined types defined in public object modules can be coerced to or from a variant or passed to late-bound functions
This is what I have (and it is also possible that the problem is with the failure to assign New LookupItem (see below)):
Public Type LookupItem
Stock As String
Price As String
End Type
Sub GetData()
Dim PreviousPrices As Collection
Dim MyStock As String
Dim CurrentPrice As String
Dim ALookupItem As LookupItem
Set PreviousPrices = New Collection
' Assumption: the first line of good data is #4
MyRow = 4
Dim Item As Variant
' Assumption: Column 2 is the Stock Symbol; there are no blank lines until the end
Do Until Trim$(Cells(MyRow, 2).Value) = ""
' Assumption: Column 8 is the Sell Date, blank if not yet Sold
If (Cells(MyRow, 8).Value = "") Then
MyStock = Cells(MyRow, 2).Value
CurrentPrice = ""
For Each Item In PreviousPrices
If Item.Stock = MyStock Then
CurrentPrice = Item.Price
Exit For
End If
Next Item
If CurrentPrice = "" Then 'Go get it and put it in CurrentPrice
...
' Set ALookupItem = New LookupItem (if not commented, this returns invalid use of New keyword)
ALookupItem.Stock = MyStock
ALookupItem.Price = CurrentPrice
PreviousPrices.Add ALookupItem
End If
End If
MyRow = MyRow + 1
Loop
End Sub
See what I've done wrong?
回答1:
As per my understanding (may be wrong), you cannot add a UDT into a collection (which is an object)
Therefore, you need to turn your UDT into a class. Then, instantiate an object and add it to the collection
回答2:
I think that VBA collections can only store native variables or objects.
I always create classes with the required members (and later I'm happy about it because I end up for adding a few methods as well).
来源：https://stackoverflow.com/questions/20895688/excel-vba-only-user-defined-types-error