Hi
I have an ultragrid that is bound via 2 BindingSources to a class derived from System.Collections.ObjectModel.Collection(Of T) where T is a custom class. Both these classes implement INotifyPropertyChanged.
The grid is used to display a series of numeric values and the form has a button that performs a recalculation of these values on request.
The problem I am having is that the grid doesn't update the displayed values properly when the button is clicked. The active row updates fine, but the other rows only update when I hover over one of the cells in the row (with each row updating one at a time, hovering over 1 row doesn't cause all rows to be updated).
Can anyone guess what I have done wrong?
Hi,
If the grid is not updating the display, then it must not be getting a notification that the data has changed.
INotifyPropertyChanged is not handled by the grid as far as I know. The grid only deals with the DataSource, not the items inside it. So the BindingSource needs to send a ListChanged notification to the grid when something is changed.
So I believe the way it should work is that the INotifyPropertyChanged notifies the list (in this case, the Collection(Of T) that a change was made, and the list then calls IList.ListChanged. Does your collection do that?
As far as I know, a Collection implements IList, but not IBindingList. So you may want to consider using a BindingList(Of T) instead of a Collection. The BindingList is more robust for data binding and supports adding rows and other functionality that IList does not. It might even handle the INotifyPropertyChanged for you - although I'm not sure about that.
Thanks Mike, changing to BindingList resolves the issue.