Why does ObservableCollection throws an exception when being modified?

Question

My application uses a WPF DataGrid. One of the columns is a template column that contains a ComboBox bound to an ObservableCollection

Answer 1

Finally I found the reason for the exception. The problem occurs when you are removing the selected item from the list. Below I've posted an incomplete piece of code.

And the view model:

// View Model
public ObservableCollection Rooms { get; private set; }
public Room SelectedRoom { get; set; }

public RemoveRoom()
{
    var room = SelectedRoom;
    //SelectedRoom = null; // Uncomment this line to avoid the exception

    Rooms.Remove(room);
}

The solution is to first set the selected item to null (or any other item) before actually removing the item from the list.

Oliver Hanappi