WPF控件经验小结：（1） ToolBar去掉右边箭头（扩展图标）

今天开发时，同事问我一个问题。怎么去除ToolBar右边扩展图标。我想了一下，说改Style。同事说太麻烦了。可不可以快速修正。我说应该动态去读取Template模板中的Style，然后隐藏。怎么实现那？

第一步，分析现有的ToolBar的样式(Style)。

<Grid x:Name="Grid" Margin="3,1,1,1" SnapsToDevicePixels="true">
                        <Grid x:Name="OverflowGrid" HorizontalAlignment="Right" Visibility="Hidden">
                            <ToggleButton x:Name="OverflowButton" ClickMode="Press" FocusVisualStyle="{x:Null}" IsChecked="{Binding IsOverflowOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" IsEnabled="{TemplateBinding HasOverflowItems}" Style="{StaticResource ToolBarHorizontalOverflowButtonStyle}"/>
                            <Popup x:Name="OverflowPopup" AllowsTransparency="true" Focusable="false" IsOpen="{Binding IsOverflowOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom" StaysOpen="false">
                                <Microsoft_Windows_Themes:SystemDropShadowChrome x:Name="Shdw" Color="Transparent">
                                    <Border x:Name="ToolBarSubMenuBorder" BorderBrush="{StaticResource ToolBarMenuBorder}" BorderThickness="1" Background="{StaticResource ToolBarSubMenuBackground}" RenderOptions.ClearTypeHint="Enabled">
                                        <ToolBarOverflowPanel x:Name="PART_ToolBarOverflowPanel" KeyboardNavigation.DirectionalNavigation="Cycle" FocusVisualStyle="{x:Null}" Focusable="true" Margin="2" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.TabNavigation="Cycle" WrapWidth="200"/>
                                    </Border>
                                </Microsoft_Windows_Themes:SystemDropShadowChrome>
                            </Popup>
                        </Grid>
                        <Border x:Name="MainPanelBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" Style="{StaticResource ToolBarMainPanelBorderStyle}" Margin="0">
                            <DockPanel KeyboardNavigation.TabIndex="1" KeyboardNavigation.TabNavigation="Local">
                                <Thumb x:Name="ToolBarThumb" Margin="-3,-1,0,0" Padding="6,5,1,6" Style="{StaticResource ToolBarThumbStyle}" Width="10"/>
                                <ContentPresenter x:Name="ToolBarHeader" ContentSource="Header" HorizontalAlignment="Center" Margin="4,0,4,0" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center"/>
                                <ToolBarPanel x:Name="PART_ToolBarPanel" IsItemsHost="true" Margin="0,1,2,2" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                            </DockPanel>
                        </Border>
                    </Grid>

　　

2，找到对应的控件，隐藏
OverflowGrid和MainPanelBorder。

Toolbar bar = new Toolbar();

Bar.Loaded += new EventHandler();

private void ToolBar_Loaded(object sender, RoutedEventArgs e)

        {

            ToolBar toolBar = sender as ToolBar;

            var overflowGrid = toolBar.Template.FindName("OverflowGrid", toolBar) as FrameworkElement;

            if (overflowGrid != null)

            {

                overflowGrid.Visibility = Visibility.Collapsed;

            }

            var mainPanelBorder = toolBar.Template.FindName("MainPanelBorder", toolBar) as FrameworkElement;

            if (mainPanelBorder != null)

            {

                mainPanelBorder.Margin = new Thickness();

            }

        }