wpf datagrid enter键无法触发keydown

在WPF中，DataGrid控件的Enter键默认是用来完成单元格编辑的，因此无法触发KeyDown事件。如果想要在按下Enter键时触发KeyDown事件，可以通过以下两种方法实现：

1.在DataGridTextColumn的EditingElementStyle中添加PreviewKeyDown事件，将PreviewKeyDown事件转换为KeyDown事件，如下所示：

<DataGridTextColumn.EditingElementStyle>
    <Style TargetType="{x:Type TextBox}">
        <EventSetter Event="PreviewKeyDown" Handler="DataGridTextColumn_PreviewKeyDown"/>
    </Style>
</DataGridTextColumn.EditingElementStyle>

在代码中实现DataGridTextColumn_PreviewKeyDown方法：

private void DataGridTextColumn_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Enter)
    {
        e.Handled = true;
        var textBox = sender as TextBox;
        var eventArgs = new KeyEventArgs(Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, 0, Key.Enter);
        eventArgs.RoutedEvent = UIElement.KeyDownEvent;
        textBox.RaiseEvent(eventArgs);
    }
}

2.在DataGrid的PreviewKeyDown事件中，判断当前按下的键是否为Enter键，如果是，则将PreviewKeyDown事件转换为KeyDown事件，如下所示：

private void DataGrid_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Enter)
    {
        e.Handled = true;
        var eventArgs = new KeyEventArgs(Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, 0, Key.Enter);
        eventArgs.RoutedEvent = UIElement.KeyDownEvent;
        (sender as DataGrid).RaiseEvent(eventArgs);
    }
}