WPF DataGrid, application crash when adding a row

Question

I have a wpf datagrid bound to a TrackableCollection. In some rare occations, and for only a few selected users, the application will crash when the user adds a new record by en

Answer 1

I had the same issue with touch screen only. I had a WPF app that was working fine until I connected the touch screen that the app was built for.

This issue occur when the DataGrid selected item was bounded to an object that was null;

I resolved it this way:

The DataGrid Xaml had this line:

SelectedItem="{Binding SelItem}"

The XVVM looked like:

public MyViewModel SelItem
{

    get
    {
        if (m_selected == null)
             return new MyViewModel();
        else
             return m_selected;
    }
}