<Style x:Key="ExpandCollapseToggleStyle" TargetType="{x:Type ToggleButton}"> <Setter Property="Focusable" Value="False"/> <Setter Property="Width" Value="10"/> <Setter Property="Height" Value="10"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ToggleButton}"> <Border Background="Transparent" Height="10" Width="10"> <Image x:Name="Tree_Ico" Source="/VirtalWelding;component/Images/TreeHidden.jpg"></Image> </Border> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="True"> </Trigger> <Trigger Property="IsChecked" Value="True"> <Setter Property="Source" TargetName="Tree_Ico" Value="/VirtalWelding;component/Images/TreeShow.jpg"></Setter> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style x:Key="TreeViewItemStyle" TargetType="{x:Type TreeViewItem}"> <Setter Property="Background" Value="Transparent"/> <Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/> <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/> <Setter Property="Padding" Value="1,0,0,0"/> <Setter Property="IsExpanded" Value="True"></Setter> <Setter Property="FocusVisualStyle" Value="{StaticResource TreeViewItemFocusVisual}"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type TreeViewItem}"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition MinWidth="19" Width="Auto"/> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="Auto"/> </Grid.RowDefinitions> <!--<ToggleButton Panel.ZIndex="1" x:Name="Expander" Margin="2,-1,0,0" ClickMode="Press" Grid.Row="0" Grid.Column="0" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/> <Rectangle Panel.ZIndex="0" Fill="#949395" Grid.Column="0" Grid.Row="1" Margin="3,-16,0,15" HorizontalAlignment="Stretch" x:Name="VLine" Stroke="#949395" VerticalAlignment="Stretch" Width="1"/> <Border x:Name="Bd" Grid.Row="0" Grid.Column="1" VerticalAlignment="Top" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true"> <ContentPresenter VerticalAlignment="Bottom" x:Name="PART_Header" TextBlock.Foreground="#FFCCCCCD" TextBlock.FontSize="14" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/> </Border> <ItemsPresenter x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1"/>--> <ToggleButton Panel.ZIndex="1" x:Name="Expander" Margin="2,-2,0,0" ClickMode="Press" Grid.Row="0" Grid.Column="0" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/> <Rectangle Panel.ZIndex="0" Grid.Column="0" Margin="-35,-10,0,15" Grid.Row="0" Fill="#949395" HorizontalAlignment="Stretch" x:Name="VLineUp" Stroke="#949395" VerticalAlignment="Stretch" Width="1"/> <Rectangle Panel.ZIndex="0" Grid.Column="0" Margin="-35,-15,0,10" Grid.Row="1" Visibility="{Binding NextBaseEntityTree,Converter={StaticResource VLineVisibiltyConverter}}" Fill="#949395" HorizontalAlignment="Stretch" x:Name="VLineDown" Stroke="#949395" VerticalAlignment="Stretch" Width="1"/> <Border x:Name="Bd" Grid.Row="0" VerticalAlignment="Center" Margin="0,0,0,0" Grid.Column="1" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true"> <ContentPresenter VerticalAlignment="Bottom" Margin="0,0,0,2" x:Name="PART_Header" TextBlock.Foreground="#FFCCCCCD" TextBlock.FontSize="14" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/> </Border> <ItemsPresenter x:Name="ItemsHost" Margin="0,0,0,0" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1"/> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsExpanded" Value="false"> <Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/> <!--<Setter Property="Visibility" TargetName="VLine" Value="Hidden"/>--> <!--<Setter Property="Margin" TargetName="VLine" Value="3,-20,0,0"/>--> </Trigger> <Trigger Property="IsExpanded" Value="true"> <Setter Property="Visibility" TargetName="ItemsHost" Value="Visible"/> <!--<Setter Property="Visibility" TargetName="VLine" Value="Visible"/>--> <!--<Setter Property="Visibility" TargetName="HLine" Value="Hidden"/>--> </Trigger> <Trigger Property="HasItems" Value="false"> <Setter Property="Visibility" TargetName="Expander" Value="Hidden"/> <!--<Setter Property="Visibility" TargetName="VLine" Value="Hidden"/>--> <Setter Property="Margin" TargetName="ItemsHost" Value="-10,0,0,0"></Setter> </Trigger> <Trigger Property="HasItems" Value="true"> <!--<Setter Property="Visibility" TargetName="HLine" Value="Visible"/>--> </Trigger> <Trigger Property="IsSelected" Value="true"> <Setter Property="Background" TargetName="Bd" Value="#FF2D2C2D"/> </Trigger> <MultiTrigger> <MultiTrigger.Conditions> <Condition Property="IsSelected" Value="true"/> <Condition Property="IsSelectionActive" Value="false"/> </MultiTrigger.Conditions> </MultiTrigger> <Trigger Property="IsEnabled" Value="false"> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style>原文：http://www.cnblogs.com/lxdonge/p/5126619.html