WPF Datagrid 点击选择item

 public static object GetElementFromPoint(System.Windows.Controls.ItemsControl itemsControl, Point point)
        {
            UIElement element = itemsControl.InputHitTest(point) as UIElement;
            while (element != null)
            {
                if (element == itemsControl)
                    return null;
                object item = itemsControl.ItemContainerGenerator.ItemFromContainer(element);
                if (!item.Equals(DependencyProperty.UnsetValue))
                    return item;
                element = (UIElement)System.Windows.Media.VisualTreeHelper.GetParent(element);
            }
            return null;
        }


private void Datagrid_PreviewMouseDoubleClick(object sender, MouseButtonEventArgs e)
{
  var item = GetElementFromPoint((ItemsControl)sender, e.GetPosition((ItemsControl)sender));      
}

或者绑定的是DataTable

 private void DataGrid1_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            DataGrid datagrid = sender as DataGrid;
            Point aP = e.GetPosition(datagrid);
            IInputElement obj = datagrid.InputHitTest(aP);
            DependencyObject target = obj as DependencyObject;

            while (target != null)
            {
                if (target is DataGridRow)
                {
                    //var s = this.dataGrid1.SelectedItem;
                    DataRow row = (this.dataGrid1.SelectedItem as DataRowView).Row;
                    if (row != null)
                    {
                        UInt64 ukey = Convert.ToUInt64(row["ukey"]);
                        byte[] content = SqlExManager.GetDpuProtectContent(ukey, _dpu.ThisInpC.Sqlmodel);
                        if (content != null)
                        {
                            ProtectTemapDll.ProtectTempClass.OpenProtecTemp(content, false);
                        }
                        else
                        {
                            MessageBox.Show("查询不到数据");
                        }
                    }
                }
                target = VisualTreeHelper.GetParent(target);
            }
        }