c# - WPF DataGrid - Event for New Rows?

Question

I'm using the WPF DataGrid (.Net 3.5 SP 1 version from the Toolkit)

What event can I subscribe to, to detect when a new row is added? (e.g. when the user moves the cursor down or presses Enter a new blank row gets added to the grid).

Eventually what I want to do is use that event to calculate some default values and put them in the new row.

The grid is bound to a DataTable, if that makes any difference.

Answer 1

The event you are looking for is DataGrid.AddingNewItem event. This event will allow you to configure the new object as you want it and then apply it to the NewItem property of the AddingNewItemEventArgs.

XAML:

<DataGrid Name="GrdBallPenetrations"
      ItemsSource="{Binding BallPenetrationCollection}" 
      SelectedItem="{Binding CurrentSelectedBallPenetration}"
      AutoGenerateColumns="False" 
      IsReadOnly="False"
      CanUserAddRows="True"
      CanUserDeleteRows="True"
      IsSynchronizedWithCurrentItem="True"
      AddingNewItem="GrdBallPenetrations_AddingNewItem">

Code behind in C#:

private void GrdBallPenetrations_AddingNewItem(object sender,
    AddingNewItemEventArgs e)
{
    e.NewItem = new BallPenetration
    {
        Id              = Guid.NewGuid(),
        CarriageWay     = CariageWayType.Plus,
        LaneNo          = 1,
        Position        = Positions.BetweenWheelTracks
    };
}