本章講述：在WPF中，背景顏色漸變的滑動條功能實現，主要通過修改Slider的樣式；

該示例就以：綠-紅顏色漸變；

樣式程式碼

<Geometry x:Key="SliderThumbOuterBorderGeometry">
	M9.5,5 C9.5,7.4852814 7.4852814,9.5 5,9.5 C2.5147186,9.5 0.5,7.4852814 0.5,5 C0.5,2.5147186 2.5147186,0.5 5,0.5 C7.4852814,0.5 9.5,2.5147186 9.5,5 z
</Geometry>
<Style x:Key="HorizontalSliderThumbStyle_Horiz" TargetType="{x:Type Thumb}">
	<Setter Property="Focusable" Value="false"/>
	<Setter Property="OverridesDefaultStyle" Value="true"/>
	<Setter Property="Height" Value="20"/>
	<Setter Property="Width" Value="11"/>
	<Setter Property="Foreground" Value="Transparent"/>
	<Setter Property="Template">
		<Setter.Value>
			<ControlTemplate TargetType="{x:Type Thumb}">
				<Canvas SnapsToDevicePixels="true">
					<Canvas.RenderTransform>
						<TranslateTransform X="0" Y="5.0"/>
					</Canvas.RenderTransform>
					<Path x:Name="Background"  Data="{StaticResource SliderThumbOuterBorderGeometry}" Fill="#FF1F9CF0" />
					<Path x:Name="InnerBorder" Data="{StaticResource SliderThumbOuterBorderGeometry}" Stroke="White"  />
					<Path x:Name="OuterBorder" Data="{StaticResource SliderThumbOuterBorderGeometry}" Stroke="Transparent" />

				</Canvas>
				<ControlTemplate.Triggers>
					<Trigger Property="IsMouseOver" Value="true">
						<Setter Property="Fill" TargetName="Background" Value="#FF29AFF5"/>
						<Setter Property="Stroke" TargetName="OuterBorder" Value="White"/>
					</Trigger>
					<Trigger Property="IsDragging" Value="true">
					</Trigger>
				</ControlTemplate.Triggers>
			</ControlTemplate>
		</Setter.Value>
	</Setter>
</Style>
<!--green red style-->
<Style x:Key="ColorSliderRepeatButtonStyle" TargetType="{x:Type RepeatButton}">
	<Setter Property="OverridesDefaultStyle" Value="true"/>
	<Setter Property="IsTabStop" Value="false"/>
	<Setter Property="Focusable" Value="false"/>
	<Setter Property="Template">
		<Setter.Value>
			<ControlTemplate TargetType="{x:Type RepeatButton}">
				<Rectangle Fill="Transparent"/>
			</ControlTemplate>
		</Setter.Value>
	</Setter>
</Style>

<Style x:Key="SliderStyle_GreenRed" TargetType="{x:Type Slider}">
	<Setter Property="Stylus.IsPressAndHoldEnabled" Value="false"/>
	<Setter Property="Background" Value="Transparent"/>
	<Setter Property="Foreground" Value="White"/>
	<Setter Property="Template">
		<Setter.Value>
			<ControlTemplate TargetType="{x:Type Slider}">
				<Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"
			Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
					<Grid Margin="0">
						<Grid.RowDefinitions>
							<RowDefinition Height="Auto"/>
							<RowDefinition Height="Auto" MinHeight="{TemplateBinding MinHeight}"/>
							<RowDefinition Height="Auto"/>
						</Grid.RowDefinitions>
						<TickBar x:Name="TopTick" Fill="{TemplateBinding Foreground}" Height="4" Placement="Top" Grid.Row="0"
					 Minimum="0" Maximum="5" Visibility="Collapsed"/>
						<TickBar x:Name="BottomTick" Fill="{TemplateBinding Foreground}" Height="4" Placement="Bottom" Grid.Row="2" Visibility="Collapsed"/>

						<Border x:Name="TrackBackground" BorderBrush="Black" BorderThickness="0" Height="4.0" Margin="5,0"
					Grid.Row="1" VerticalAlignment="center" CornerRadius="3">
							<Border.Background>
								<LinearGradientBrush StartPoint="0,0" EndPoint="1,0"   >
									<GradientStop Offset="0.0" Color="#FF00FFFF"/>
									<GradientStop Offset="1.0" Color="#FF0000"/>
								</LinearGradientBrush>
							</Border.Background>
						</Border>

						<Track x:Name="PART_Track" Grid.Row="1">
							<Track.DecreaseRepeatButton>
								<RepeatButton Command="{x:Static Slider.DecreaseLarge}" Style="{StaticResource ColorSliderRepeatButtonStyle}"/>
							</Track.DecreaseRepeatButton>
							<Track.IncreaseRepeatButton>
								<RepeatButton Command="{x:Static Slider.IncreaseLarge}" Style="{StaticResource ColorSliderRepeatButtonStyle}"
								  HorizontalAlignment="Right" Width="153"/>
							</Track.IncreaseRepeatButton>
							<Track.Thumb>
								<Thumb x:Name="Thumb" Style="{StaticResource HorizontalSliderThumbStyle_Horiz}" Margin="0,1,0,0"/>
							</Track.Thumb>
						</Track>
					</Grid>
				</Border>
				<ControlTemplate.Triggers>
					<Trigger Property="TickPlacement" Value="TopLeft">
						<Setter Property="Margin" TargetName="TrackBackground" Value="5,0,5,0"/>
					</Trigger>
					<Trigger Property="TickPlacement" Value="BottomRight">
						<Setter Property="Margin" TargetName="TrackBackground" Value="5,0,5,0"/>
					</Trigger>
					<Trigger Property="TickPlacement" Value="Both">
					</Trigger>
					<Trigger Property="IsSelectionRangeEnabled" Value="true">
					</Trigger>
					<Trigger Property="IsKeyboardFocused" Value="true">
						<Setter Property="Foreground" TargetName="Thumb" Value="Blue"/>
					</Trigger>
				</ControlTemplate.Triggers>
			</ControlTemplate>
		</Setter.Value>
	</Setter>
</Style>
 

引用示例程式碼

<Slider Margin="10,5" x:Name="GreenRed" HorizontalAlignment="Left"  VerticalAlignment="Center" Height="20" Width="250"
                Value="{Binding RedColor, Mode=TwoWay}"  Style="{DynamicResource  SliderStyle_GreenRed}" IsSnapToTickEnabled="True" Minimum="-100"
                Maximum="100" Background="Transparent"/>
 

效果圖