如何使WPF DataGrid滚动条也覆盖不可滚动区域？

Question

我不确定这是否只是我的机器（WinXP SP3），因为我没有在其他人的屏幕截图中看到它。

在我看来，DataGrid 中的滚动条仅覆盖可滚动区域。这意味着，列和行标题区域以及右下角以背景颜色显示，这对我来说看起来很难看。如何使滚动条延伸到控件的边缘（就像更常规的控件一样）？ DataGrid 中有为此的属性吗？

如果您没有更改 DataGrid 的背景颜色，您可能看不到它。我有一个屏幕截图此处来说明这个问题。

Answer 1

好吧，经过一番挣扎，我自己弄清楚了。如果有人关心的话...将这种样式放入您的 App.xaml 中。

<ControlTemplate x:Key="SelectAllButtonTemplate" TargetType="{x:Type Button}">
    <Grid>
        <Rectangle x:Name="Border"
             Fill="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" 
             SnapsToDevicePixels="True" />
        <Polygon x:Name="Arrow"
           HorizontalAlignment="Right"
           VerticalAlignment="Bottom"
           Margin="8,8,3,3"
           Opacity="0.15"
           Fill="Black"
           Stretch="Uniform"
           Points="0,10 10,10 10,0" />
    </Grid>
    <ControlTemplate.Triggers>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter TargetName="Border" Property="Stroke" Value="{DynamicResource {x:Static SystemColors.ControlDarkBrushKey}}" />
        </Trigger>
        <Trigger Property="IsPressed" Value="True">
            <Setter TargetName="Border" Property="Fill" Value="{DynamicResource {x:Static SystemColors.ControlDarkBrushKey}}" />
        </Trigger>
        <Trigger Property="IsEnabled" Value="False">
            <Setter TargetName="Arrow" Property="Visibility" Value="Collapsed" />
        </Trigger>
    </ControlTemplate.Triggers>
</ControlTemplate>

<Style TargetType="{x:Type DataGrid}">
    <Setter Property="Background"
            Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
    <Setter Property="Foreground"
            Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
    <Setter Property="BorderBrush" Value="#FF688CAF" />
    <Setter Property="BorderThickness" Value="1" />
    <Setter Property="RowDetailsVisibilityMode" Value="VisibleWhenSelected" />
    <Setter Property="ScrollViewer.CanContentScroll"
            Value="true"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type DataGrid}">
                <Border Background="{TemplateBinding Background}"
              BorderBrush="{TemplateBinding BorderBrush}"
              BorderThickness="{TemplateBinding BorderThickness}"
              SnapsToDevicePixels="True"
              Padding="{TemplateBinding Padding}">
                    <ScrollViewer   Focusable="false"
                        Name="DG_ScrollViewer">
                        <ScrollViewer.Template>
                            <ControlTemplate TargetType="{x:Type ScrollViewer}">
                                <Grid>
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="Auto"/>
                                        <RowDefinition Height="*"/>
                                        <RowDefinition Height="Auto"/>
                                    </Grid.RowDefinitions>

                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="Auto"/>
                                        <ColumnDefinition Width="*"/>
                                        <ColumnDefinition Width="Auto"/>
                                    </Grid.ColumnDefinitions>

                                    <!--Left Column Header Corner -->
                                    <Button Command="{x:Static DataGrid.SelectAllCommand}"
                        Width="{Binding RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Path=CellsPanelHorizontalOffset}"
                        Template="{StaticResource SelectAllButtonTemplate}"
                        Focusable="false"
                        Visibility="{Binding RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Path=HeadersVisibility, Converter={x:Static DataGrid.HeadersVisibilityConverter}, ConverterParameter={x:Static DataGridHeadersVisibility.All}}" />
                                    <!--Column Headers-->
                                    <DataGridColumnHeadersPresenter Grid.Column="1" 
                                                   x:Name="PART_ColumnHeadersPresenter"
                                                   Visibility="{Binding RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Path=HeadersVisibility, Converter={x:Static DataGrid.HeadersVisibilityConverter}, ConverterParameter={x:Static DataGridHeadersVisibility.Column}}"/>

                                    <!--DataGrid content-->
                                    <ScrollContentPresenter x:Name="PART_ScrollContentPresenter" Grid.Row="1" Grid.ColumnSpan="2" CanContentScroll="{TemplateBinding CanContentScroll}" />

                                    <!-- Changed Grid.Row="1" to Grid.Row="0" Grid.RowSpan="2" to make the scrollbar start from top -->
                                    <ScrollBar Grid.Row="0" Grid.RowSpan="2" Grid.Column="2" Name="PART_VerticalScrollBar"
                                         Orientation="Vertical"
                                         Maximum="{TemplateBinding ScrollableHeight}"
                                         ViewportSize="{TemplateBinding ViewportHeight}"
                                         Value="{Binding Path=VerticalOffset, RelativeSource={RelativeSource TemplatedParent}, Mode=OneWay}"
                                         Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"/>

                                    <!--Grid Grid.Row="2" Grid.Column="1">
                  <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="{Binding RelativeSource={RelativeSource AncestorType={x:Type dg:DataGrid}}, Path=NonFrozenColumnsViewportHorizontalOffset}"/>
                    <ColumnDefinition Width="*"/>
                  </Grid.ColumnDefinitions>
                  <ScrollBar Grid.Column="1"
                             Name="PART_HorizontalScrollBar"
                             Orientation="Horizontal"
                             Maximum="{TemplateBinding ScrollableWidth}"
                             ViewportSize="{TemplateBinding ViewportWidth}"
                             Value="{Binding Path=HorizontalOffset, RelativeSource={RelativeSource TemplatedParent}, Mode=OneWay}"
                             Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>

                </Grid-->
                                    <!-- Make the scrollbar to start from left edge -->
                                    <ScrollBar Grid.Column="0" Grid.Row="2" Grid.ColumnSpan="2"
                                            Name="PART_HorizontalScrollBar"
                                            Orientation="Horizontal"
                                            Maximum="{TemplateBinding ScrollableWidth}"
                                            ViewportSize="{TemplateBinding ViewportWidth}"
                                            Value="{Binding Path=HorizontalOffset, RelativeSource={RelativeSource TemplatedParent}, Mode=OneWay}"
                                            Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>
                                </Grid>
                            </ControlTemplate>
                        </ScrollViewer.Template>
                        <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </ScrollViewer>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="IsGrouping" Value="true">
            <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
        </Trigger>
    </Style.Triggers>
</Style>