Datagrid没有用c＃在wpf中显示数据

I am trying to use a dataGrid in WPF with c#. But I cannot get my datagrid to show any of my data in the table when I run my program in debug mode. I have this code executing when the datagrid loads. But all I see is an empty square.I am trying to use a dataGrid in WPF with c#. B