wpf datagrid 行双击事件

Xaml：

<DataGrid ItemsSource="{Binding SessionList}"
Grid.Row="2"
Grid.Column="0"
Grid.ColumnSpan="2"
AutoGenerateColumns="False"
ScrollViewer.CanContentScroll="False"
IsReadOnly="True"
HorizontalScrollBarVisibility="Auto"
SelectionMode="Single"
VerticalScrollBarVisibility="Auto"
MouseDoubleClick="datagrid_MouseDoubleClick"
CanUserAddRows="True"/>

cs代码：

private void datagrid_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)
　　　　{
　　　　　　break;
　　　　}
　　　　target = VisualTreeHelper.GetParent(target);
　　}
}