How to raise an event when DataGrid.ItemsSource is changed

Question

I am new in WPF, and I am working with DataGrids and I need to know when the property ItemsSource is changed.

For example, I would need that when this instruction is

Answer 1

ItemsSource is a dependency property, so it's easy enough to be notified when the property is changed to something else. You would want to use this in addition to code that you have, not instead of:

In Window.Loaded (or similar) you can subscribe like so:

var dpd = DependencyPropertyDescriptor.FromProperty(ItemsControl.ItemsSourceProperty, typeof(DataGrid));
if (dpd != null)
{
    dpd.AddValueChanged(myGrid, ThisIsCalledWhenPropertyIsChanged);
}

And have a change handler:

private void ThisIsCalledWhenPropertyIsChanged(object sender, EventArgs e)
{
}

Whenever the ItemsSource Property is set, the ThisIsCalledWhenPropertyIsChanged method is called.

You can use this for any dependency property you want to be notified about changes.