Question

I have a DataGrid showing some databases having quite some columns.
I would like that, when the user edit a new row, some values are set automatically.
With the windows form DataGrid that would be easy, since there’s RowsAdded event handler.
But how could i handle this with the wpf DataGrid ??
Edit : my DataGrid is bound in Xaml to a public property which is an ITable. When user select a table in a ComboBox, the property is updated with corresponding table.
Yes there’s autogenerating column, and the way the user can enter a new row is to edit the last blank row (default behaviour).

Answer 1

Ok i think i got it.
When a DataTable is bound to a DataGrid, a CollectionView is created in order to see it. You can get it by using the (static/shared) CollectionView.GetDefaultView(ThePropertyThatIsBound) method.
Since it implements ICollectionChanged, you can add an event handler to the CollectionChangedEvent.

In the CollectionChanged event handler, if you have a new item (e.NewItems.Count>0) you must check it against System.Windows.Data.CollectionView.NewItemPlaceholder and if it is not a place holder, then it is a brand new item, for wich i can set all default values.