mtavares posted on Wednesday, October 04, 2006
Hi Rocky,
Yesterday, I posted an issue with passing an empty BO to a Detailsview so that the detailsview would know the BO is empty and act accordingly. You can view that post here:
http://forums.lhotka.net/forums/thread/7120.aspxAfter some digging I think I have come up with a possible solution, in regards to changing some code in the ExecuteSelect method of the CslaDatasource.
The original code had the following:
' if the result isn't IEnumerable then
' wrap it in a collection
If Not TypeOf result Is IEnumerable Then
Dim list As New ArrayList
list.Add(result)
result = list
End If
Now
with the original code if result (the BO) is nothing, then when the
control is bound to the detailsview an error occurs. But if I change
it to:
' if the result isn't IEnumerable then
' wrap it in a collection
If Not TypeOf result Is IEnumerable Then
Dim list As New ArrayList
If result IsNot Nothing Then
list.Add(result)
End If
result = list
End If
Then
I get the results I was looking for. the Details view will return the
Empty Data Row because it is looking at an empty ArrayList instead of
an arraylist with one item set to nothing. I decided to test this same
thing out with a collection based BO with a gridview, and the results
were still good where the Empty Data Row for the gridview was
displayed. I also tried a bound dropdownlist and it was still ok.
So
that being said, do you see any
repercussions with only adding the result to the list if it is not
nothing? My tests seemed to be fine, but I may not be accounting for
something.
Thanks,
Mike
