在 MouseDown 事件 Datagrid 之前获取行选择

Question

我在 Datagrid 中获得了我的 Image-Row 的 XAML：

<DataGridTemplateColumn  x:Name="imgSettings" Width="*">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <Image x:Name="imgSettings"  Source="img/settings_blue.png" Stretch="None" MouseDown="Row_DoubleClick" />
            <DataTemplate.Triggers>
                <DataTrigger Binding="{Binding IsSelected, 
                  RelativeSource={RelativeSource AncestorType=DataGridRow}}" Value="True">
                    <Setter TargetName="imgSettings" Property="Source" Value="/img/settings_white.png" />
                </DataTrigger>
            </DataTemplate.Triggers>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

我的Double Click 行事件是：

private void Row_DoubleClick(object sender, MouseButtonEventArgs e)
{
    Equipment classObj = clientDataGrid.SelectedItem as Equipment;
    string cellValue = classObj.EQNr;

    lblArtikel.Content = "Equipment: " + cellValue ;
    Dispatcher.BeginInvoke((Action)(() => tbControlETK.SelectedIndex = 1));
}

这实际上有效，但现在我尝试为这个图像按钮获取相同的功能，但这给了我一个空异常，因为 MouseDown 事件在 Row 被选中之前触发......任何解决方案？

我已经想到了一个用于图像行的函数，我可以在其中获取发送者的行或类似的东西。

Answer 1

您可以在可视化树中搜索要选择的 DataGridRow 并使用它们，如果您找到了这样一个。

<Image x:Name="imgSettings"  Source="img/settings_blue.png" Stretch="None" MouseDown="Mouse_Down" />



private void Mouse_Down(object sender, MouseButtonEventArgs e)
        {
            DataGridRow gridRowGettingSelection = null;
            var visParent = VisualTreeHelper.GetParent(sender as FrameworkElement);
            while (gridRowGettingSelection == null && visParent != null)
            {
                gridRowGettingSelection = visParent as DataGridRow;
                visParent = VisualTreeHelper.GetParent(visParent);
            }
            if (gridRowGettingSelection == null) { return; }

            Equipment classObj = gridRowGettingSelection.DataContext as Equipment;
            string cellValue = classObj.EQNr;

            lblArtikel.Content = "Equipment: " + cellValue;
            Dispatcher.BeginInvoke((Action)(() => tbControlETK.SelectedIndex = 1));

        }