c# - 如何单击嵌套在数据网格中的数据网格中的复选框

Question

我差点用谷歌搜索到死。我看到了很多解决我的问题的方法，但它们都不起作用......我只能假设这是因为我在中心嵌套了带有复选框的数据网格。现在我的应用程序需要两次点击才能更改复选框的选中状态。我假设第一次点击是为了关注相应的行？或单元格，第二次单击会激活检查状态更改。

这是我的 XAML:

<Grid>
    <DockPanel ScrollViewer.CanContentScroll="True" ScrollViewer.VerticalScrollBarVisibility="Auto" VirtualizingPanel.IsContainerVirtualizable="True" >
        <TextBox x:Name="textBoxSearch" DockPanel.Dock="Top" Margin="10" TextChanged="TxtFilter_TextChanged" Height="25" MinWidth="250" HorizontalAlignment="Stretch"/>
        <DataGrid x:Name="objDatagrid" ItemsSource="{Binding DataView}" CanUserAddRows="False" CanUserDeleteRows="False" AutoGenerateColumns="False"
              HeadersVisibility="None" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RowDetailsVisibilityMode="Visible"
                  VirtualizingPanel.VirtualizationMode="Recycling">
            <DataGrid.GroupStyle>
                <!-- Style for groups at top level. -->
                <GroupStyle>
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="{x:Type GroupItem}">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type GroupItem}">
                                        <Expander Margin="15 0 15 0" IsExpanded="True" HorizontalAlignment="Stretch">
                                            <Expander.Header>
                                                <!-- Control for the expander header text -->
                                                <custom:HighlightTextBlock Text="{Binding Path=Name}" 
                                                                             HighlightPhrase="{Binding ElementName=textBoxSearch, Path=Text}"
                                                                             HighlightBrush="Lime"/>
                                            </Expander.Header>
                                            <ItemsPresenter HorizontalAlignment="Stretch" />
                                        </Expander>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                </GroupStyle>
            </DataGrid.GroupStyle>
            <DataGrid.Columns>
                <DataGridTemplateColumn>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <!-- Question Container Textblock. -->
                            <custom:HighlightTextBlock Text="{Binding QuestionText}" FontWeight="Bold"
                                                         HighlightPhrase="{Binding ElementName=textBoxSearch, Path=Text}"
                                                         HighlightBrush="Lime"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
            <DataGrid.RowDetailsTemplate>
                <DataTemplate>
                    <DataGrid x:Name="objInnerDatagrid" ItemsSource="{Binding Answers}" CanUserAddRows="False" CanUserDeleteRows="False"
                              HeadersVisibility="None" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                              AutoGenerateColumns="False">

                        <DataGrid.Columns>
                            <DataGridTemplateColumn>
                                <DataGridTemplateColumn.CellTemplate>
                                    <DataTemplate>
                                        <DockPanel>
                                            <CheckBox DockPanel.Dock="Top" Checked="CheckBox_Checked" Unchecked="CheckBox_Checked" IsChecked="{Binding Path=IsSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
                                                <CheckBox.Content>
                                                    <!-- Answer Checkbox Content : Textblock. -->
                                                    <custom:HighlightTextBlock Text="{Binding AnswerText}"
                                                                             HighlightPhrase="{Binding ElementName=textBoxSearch, Path=Text}" HighlightBrush="Lime"/>
                                                </CheckBox.Content>
                                            </CheckBox>
                                            <custom:TestUC Margin="20,10,0,0" HorizontalAlignment="Stretch" Visibility="Collapsed" x:Name="SubQuestionUserControl"/>

                                        </DockPanel>
                                    </DataTemplate>
                                </DataGridTemplateColumn.CellTemplate>
                            </DataGridTemplateColumn>
                        </DataGrid.Columns>
                    </DataGrid>
                </DataTemplate>
            </DataGrid.RowDetailsTemplate>
        </DataGrid>
    </DockPanel>
</Grid>

我试过设置样式:

 <UserControl.Resources>
    <vm:StringToVisibilityConverter x:Key="StringToVisibilityConverter"/>
    <BooleanToVisibilityConverter x:Key="BoolToVisibility"/>
    <!--<Style TargetType="custom:DataGridWithNavigation" BasedOn="{StaticResource {x:Type DataGrid}}"/>-->
    <!--<Style TargetType="{x:Type DataGridCell}">
        <EventSetter Event="PreviewMouseLeftButtonDown" Handler="DataGridCell_PreviewMouseLeftButtonDown" />
        <EventSetter Event="PreviewTextInput" Handler="DataGridCell_PreviewTextInput" />
    </Style>-->
    <!--<Style x:Key="dataGridStyle" TargetType="{x:Type DataGridCell}">
        <EventSetter Event="PreviewMouseLeftButtonDown" Handler="DataGridCell_PreviewMouseLeftButtonDown"></EventSetter>
    </Style>-->
    <!--<Style TargetType="{x:Type DataGridRow}">
        <EventSetter Event="MouseEnter" Handler="DataGridCell_PreviewMouseLeftButtonDown"></EventSetter>
    </Style>-->
    <!--<Style TargetType="DataGridRow">
        <Style.Triggers>
            <Trigger Property="IsMouseOver" Value="True">
                <Setter Property="IsSelected" Value="True" />
            </Trigger>
        </Style.Triggers>
    </Style>-->
    <!--<Style TargetType="DataGridCell">
        <Style.Triggers>
            <MultiTrigger>
                <MultiTrigger.Conditions>
                    <Condition Property="IsReadOnly" Value="False" />
                    <Condition Property="IsMouseOver" Value="True" />
                </MultiTrigger.Conditions>
                <Setter Property="IsEditing" Value="True" />
            </MultiTrigger>
        </Style.Triggers>
    </Style>-->
</UserControl.Resources>

不幸的是，我不再拥有用于显示任何这些关联事件的代码。

我也曾尝试在这里使用某人的自定义数据网格类引用: https://stackoverflow.com/a/4827377/5807358

这个自定义类(class)让我最接近。事实上它工作得很好......直到我需要取消选中该复选框(位于内部数据网格中)。如果不首先切换到主数据网格的另一行然后再返回，则无法更改已选中框的选中状态。我摆弄着尝试进一步自定义该类以获得我想要的东西，但结果很短。

我还应该注意，我已经尝试了上面发布的 stackoverflow 链接上的所有解决方案。

有没有人遇到过这个？如果有人认为相关，我可以发布我的代码隐藏。

谢谢

Answer 1

我在这里找到了答案! : http://blog.ditran.net/wpf-datagrid-rowdetailstemplate-double-click-focus-fix/

我会发布代码以防帖子被删除:

<DataGrid.RowStyle>
                <Style TargetType="{x:Type DataGridRow}">
                    <EventSetter Event="PreviewMouseLeftButtonDown" Handler="SelectRowDetailSection"/>
                </Style>
</DataGrid.RowStyle>

事件处理器:

void SelectRowDetailSection(object sender, MouseButtonEventArgs e)
    {
        var row = sender as DataGridRow;
        if (row != null)
        {
            row.Focusable = true;
            row.Focus();
            // Creating a FocusNavigationDirection object and setting it to a
            // local field that contains the direction selected.
            FocusNavigationDirection focusDirection = FocusNavigationDirection.Next;
            // MoveFocus takes a TraveralReqest as its argument.
            TraversalRequest request = new TraversalRequest(focusDirection);
            // Gets the element with keyboard focus.
            UIElement elementWithFocus = Keyboard.FocusedElement as UIElement;
            // Change keyboard focus.
            if (elementWithFocus != null)
            {
                elementWithFocus.MoveFocus(request);
            }
        }
    }

上面的样式需要添加到 outter 中。当我将它添加到 UserControl.Resources 部分时，它什么也没做。我应该注意到，我必须向 DataGridRow 添加一个额外的样式。使用上述代码时，选择行时，行 header 消失了。这可能是由我这边的某些事情引起的。我正在使用 mahapps.metro 来设计我的窗口。我敢打赌这可能是罪魁祸首。