在WPF开发中，许多地方都会使用到滚动条及ScrollViewer控件，这个控件的原皮肤有点差强人意。需要我们自己动手改造

1、添加ScrollViewerStyle.xaml样式文件

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:sys="clr-namespace:System;assembly=mscorlib">

    <SolidColorBrush x:Key="ScrollBarDisabledBackground" Color="#F4F4F4"/>

    <Style x:Key="VerticalScrollBarPageButton" TargetType="{x:Type RepeatButton}">
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RepeatButton}">
                    <Rectangle Fill="{TemplateBinding Background}" Height="{TemplateBinding Height}" Width="{TemplateBinding Width}"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <!--滚动条颜色、圆角等设置-->
    <Style x:Key="ScrollBarThumb" TargetType="{x:Type Thumb}">
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Thumb}">
                    <!--滚动条颜色和圆角设置-->
                    <Rectangle Name="thumbRect" Fill="#4BB2FF" RadiusX="3" RadiusY="3" Opacity="0.4"/>
                    <!--鼠标拉动滚动条时的颜色-->
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Fill" Value="#1E9FFF" TargetName="thumbRect" />
                            <Setter Property="Opacity" Value="1" TargetName="thumbRect" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="HorizontalScrollBarPageButton" TargetType="{x:Type RepeatButton}">
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RepeatButton}">
                    <Rectangle Fill="{TemplateBinding Background}" Height="{TemplateBinding Height}" Width="{TemplateBinding Width}"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="LeadScrollBarStyle" TargetType="{x:Type ScrollBar}">
        <Setter Property="Background" Value="AliceBlue"/>
        <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false"/>
        <Setter Property="Stylus.IsFlicksEnabled" Value="false"/>
        <!--滚动条宽度-->
        <Setter Property="Width" Value="9"/>
        <Setter Property="MinWidth" Value="9"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ScrollBar}">
                    <!--滚动条背景色-->
                    <Grid x:Name="Bg" Background="Transparent" SnapsToDevicePixels="true" Width="9">
                        <Grid.RowDefinitions>
                            <RowDefinition />
                        </Grid.RowDefinitions>
                        <Track x:Name="PART_Track" IsDirectionReversed="true" IsEnabled="{TemplateBinding IsMouseOver}">
                            <Track.DecreaseRepeatButton>
                                <RepeatButton Command="{x:Static ScrollBar.PageUpCommand}" Style="{StaticResource VerticalScrollBarPageButton}"/>
                            </Track.DecreaseRepeatButton>
                            <Track.IncreaseRepeatButton>
                                <RepeatButton Command="{x:Static ScrollBar.PageDownCommand}" Style="{StaticResource VerticalScrollBarPageButton}"/>
                            </Track.IncreaseRepeatButton>
                            <Track.Thumb>
                                <Thumb Style="{StaticResource ScrollBarThumb}"/>
                            </Track.Thumb>
                        </Track>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Background" TargetName="Bg" Value="{StaticResource ScrollBarDisabledBackground}"/>
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="False">
                            <Setter Property="Width" Value="9"/>
                            <Setter Property="Width" TargetName="Bg" Value="9"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <Trigger Property="Orientation" Value="Horizontal">
                <Setter Property="Width" Value="Auto"/>
                <Setter Property="MinWidth" Value="0"/>
                <Setter Property="Height" Value="9"/>
                <Setter Property="MinHeight" Value="9"/>
                <Setter Property="Background" Value="AliceBlue"/>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type ScrollBar}">
                            <Grid x:Name="Bg" Background="Transparent" SnapsToDevicePixels="true" Height="9">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition />
                                </Grid.ColumnDefinitions>
                                <Track x:Name="PART_Track" IsEnabled="{TemplateBinding IsMouseOver}">
                                    <Track.DecreaseRepeatButton>
                                        <RepeatButton Command="{x:Static ScrollBar.PageLeftCommand}" Style="{StaticResource HorizontalScrollBarPageButton}"/>
                                    </Track.DecreaseRepeatButton>
                                    <Track.IncreaseRepeatButton>
                                        <RepeatButton Command="{x:Static ScrollBar.PageRightCommand}" Style="{StaticResource HorizontalScrollBarPageButton}"/>
                                    </Track.IncreaseRepeatButton>
                                    <Track.Thumb>
                                        <Thumb Style="{StaticResource ScrollBarThumb}" />
                                    </Track.Thumb>
                                </Track>
                            </Grid>
                            <ControlTemplate.Triggers>
                                <Trigger Property="IsEnabled" Value="false">
                                    <Setter Property="Background" TargetName="Bg" Value="{StaticResource ScrollBarDisabledBackground}"/>
                                </Trigger>
                                <Trigger Property="IsMouseOver" Value="False">
                                    <Setter Property="Height" Value="9"/>
                                    <Setter Property="Height" TargetName="Bg" Value="9"/>
                                </Trigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Trigger>
        </Style.Triggers>
    </Style>

    <Style x:Key="LeadScrollViewerStyle" TargetType="{x:Type ScrollViewer}">
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="Focusable" Value="false" />
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ScrollViewer">
                    <Grid x:Name="Grid" Background="{TemplateBinding Background}">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="*"/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>
                        <Rectangle x:Name="Corner" Grid.Column="1" Fill="White" Grid.Row="1"/>
                        <ScrollContentPresenter x:Name="PART_ScrollContentPresenter" CanContentScroll="{TemplateBinding CanContentScroll}" CanHorizontallyScroll="False" CanVerticallyScroll="False" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Grid.Column="0" Margin="{TemplateBinding Padding}" Grid.Row="0"/>
                        <ScrollBar x:Name="PART_VerticalScrollBar" AutomationProperties.AutomationId="VerticalScrollBar" Cursor="Arrow" Grid.Column="1" Maximum="{TemplateBinding ScrollableHeight}" Minimum="0" Grid.Row="0" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize="{TemplateBinding ViewportHeight}" Style="{DynamicResource LeadScrollBarStyle}"/>
                        <ScrollBar x:Name="PART_HorizontalScrollBar" AutomationProperties.AutomationId="HorizontalScrollBar" Cursor="Arrow" Grid.Column="0" Maximum="{TemplateBinding ScrollableWidth}" Minimum="0" Orientation="Horizontal" Grid.Row="1" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize="{TemplateBinding ViewportWidth}" Style="{DynamicResource LeadScrollBarStyle}"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <!-- 全局引用 -->
    <Style BasedOn="{StaticResource LeadScrollViewerStyle}" TargetType="{x:Type ScrollViewer}" />

</ResourceDictionary>

2、App.xaml配置样式文件引用

<ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="pack://application:,,,/Wpf;component/Style/ScrollViewerStyle.xaml"></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>

3、界面使用

<Border BorderBrush="#4F4F4F" BorderThickness="1" Width="Auto">
    <ScrollViewer Height="200" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Visible">
        <StackPanel Height="250" Width="1800">

        </StackPanel>
    </ScrollViewer>
</Border>

4、正常展示：

5、拉动滚动条展示：