datagrid获得选中行的id

var hit = VisualTreeHelper.HitTest((Visual)sender, e.GetPosition((IInputElement)sender));
 DependencyObject cell = VisualTreeHelper.GetParent(hit.VisualHit);
 
 while(cell != null && !(cell is System.Windows.Controls.DataGridCell))
 {
          cell = VisualTreeHelper.GetParent(cell);
 }
 
System.Windows.Controls.DataGridCell targetCell = cell as System.Windows.Controls.DataGridCell;
 
if(targetCell != null)
{
           targetRow = targetCell;
           Tags_Model m = targetRow.DataContext as Tags_Model;
           int k =  m.ID;
            _view.DeleteRecordByIndex(k);
}