一、实现对ScrollViewer样式的自定义主要包括：
1、滚动条宽度设置
2、滚动条颜色
3、滚动条圆角
4、滚动条拉动时的效果mouseover
二、实现效果：
三、实现方法
1、创建资源字典（ResourceDictionary）文件
由于style代码比较多，之间在控件文件中加载style比较混乱，也不利于其它窗口复用，这里单独创建了ScrollViewDictionary.xaml文件代码如下：
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<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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<ControlTemplate x:Key="MyScrollViewer" TargetType="{x:Type ScrollViewer}">
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<!--View区域背景色-->
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<Grid x:Name="Grid" Background="{TemplateBinding Background}">
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<Grid.ColumnDefinitions>
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<ColumnDefinition Width="*"/>
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<ColumnDefinition Width="Auto"/>
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</Grid.ColumnDefinitions>
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<Grid.RowDefinitions>
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<RowDefinition Height="*"/>
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<RowDefinition Height="Auto"/>
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</Grid.RowDefinitions>
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<Rectangle x:Name="Corner" Grid.Column="1" Fill="White" Grid.Row="1"/>
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<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"/>
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<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 MyScrollBarStyle}"/>
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<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 MyScrollBarStyle}"/>
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</Grid>
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</ControlTemplate>
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<SolidColorBrush x:Key="ScrollBarDisabledBackground" Color="#F4F4F4"/>
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<Style x:Key="VerticalScrollBarPageButton" TargetType="{x:Type RepeatButton}">
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<Setter Property="OverridesDefaultStyle" Value="true"/>
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<Setter Property="Background" Value="Transparent"/>
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<Setter Property="Focusable" Value="false"/>
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<Setter Property="IsTabStop" Value="false"/>
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<Setter Property="Template">
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<Setter.Value>
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<ControlTemplate TargetType="{x:Type RepeatButton}">
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<Rectangle Fill="{TemplateBinding Background}" Height="{TemplateBinding Height}" Width="{TemplateBinding Width}"/>
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</ControlTemplate>
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</Setter.Value>
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</Setter>
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</Style>
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<!--滚动条颜色、圆角等设置-->
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<Style x:Key="ScrollBarThumb" TargetType="{x:Type Thumb}">
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<Setter Property="OverridesDefaultStyle" Value="true"/>
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<Setter Property="IsTabStop" Value="false"/>
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<Setter Property="Template">
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<Setter.Value>
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<ControlTemplate TargetType="{x:Type Thumb}">
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<!--滚动条颜色和圆角设置-->
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<Rectangle Name="thumbRect" Fill="#03ffea" RadiusX="3" RadiusY="3"/>
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<!--鼠标拉动滚动条时的颜色-->
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<ControlTemplate.Triggers>
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<Trigger Property="IsMouseOver" Value="True">
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<Setter Property="Fill" Value="CornflowerBlue" TargetName="thumbRect" />
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</Trigger>
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</ControlTemplate.Triggers>
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</ControlTemplate>
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</Setter.Value>
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</Setter>
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</Style>
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<Style x:Key="HorizontalScrollBarPageButton" TargetType="{x:Type RepeatButton}">
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<Setter Property="OverridesDefaultStyle" Value="true"/>
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<Setter Property="Background" Value="Transparent"/>
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<Setter Property="Focusable" Value="false"/>
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<Setter Property="IsTabStop" Value="false"/>
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<Setter Property="Template">
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<Setter.Value>
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<ControlTemplate TargetType="{x:Type RepeatButton}">
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<Rectangle Fill="{TemplateBinding Background}" Height="{TemplateBinding Height}" Width="{TemplateBinding Width}"/>
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</ControlTemplate>
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</Setter.Value>
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</Setter>
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</Style>
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<Style x:Key="MyScrollBarStyle" TargetType="{x:Type ScrollBar}">
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<Setter Property="Background" Value="AliceBlue"/>
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<Setter Property="Stylus.IsPressAndHoldEnabled" Value="false"/>
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<Setter Property="Stylus.IsFlicksEnabled" Value="false"/>
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<!--滚动条宽度-->
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<Setter Property="Width" Value="8"/>
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<Setter Property="MinWidth" Value="6"/>
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<Setter Property="Template">
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<Setter.Value>
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<ControlTemplate TargetType="{x:Type ScrollBar}">
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<!--滚动条背景色-->
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<Grid x:Name="Bg" Background="#001f55" SnapsToDevicePixels="true" Width="8">
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<Grid.RowDefinitions>
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<RowDefinition />
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</Grid.RowDefinitions>
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<Track x:Name="PART_Track" IsDirectionReversed="true" IsEnabled="{TemplateBinding IsMouseOver}">
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<Track.DecreaseRepeatButton>
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<RepeatButton Command="{x:Static ScrollBar.PageUpCommand}" Style="{StaticResource VerticalScrollBarPageButton}"/>
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</Track.DecreaseRepeatButton>
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<Track.IncreaseRepeatButton>
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<RepeatButton Command="{x:Static ScrollBar.PageDownCommand}" Style="{StaticResource VerticalScrollBarPageButton}"/>
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</Track.IncreaseRepeatButton>
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<Track.Thumb>
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<Thumb Style="{StaticResource ScrollBarThumb}"/>
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</Track.Thumb>
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</Track>
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</Grid>
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<ControlTemplate.Triggers>
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<Trigger Property="IsEnabled" Value="false">
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<Setter Property="Background" TargetName="Bg" Value="{StaticResource ScrollBarDisabledBackground}"/>
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</Trigger>
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</ControlTemplate.Triggers>
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</ControlTemplate>
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</Setter.Value>
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</Setter>
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<Style.Triggers>
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<Trigger Property="Orientation" Value="Horizontal">
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<Setter Property="Width" Value="Auto"/>
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<Setter Property="MinWidth" Value="0"/>
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<Setter Property="Height" Value="6"/>
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<Setter Property="MinHeight" Value="6"/>
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<Setter Property="Background" Value="AliceBlue"/>
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<Setter Property="Template">
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<Setter.Value>
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<ControlTemplate TargetType="{x:Type ScrollBar}">
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<Grid x:Name="Bg" Background="Red" SnapsToDevicePixels="true">
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<Grid.ColumnDefinitions>
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<ColumnDefinition />
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</Grid.ColumnDefinitions>
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<Track x:Name="PART_Track" IsEnabled="{TemplateBinding IsMouseOver}">
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<Track.DecreaseRepeatButton>
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<RepeatButton Command="{x:Static ScrollBar.PageLeftCommand}" Style="{StaticResource HorizontalScrollBarPageButton}"/>
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</Track.DecreaseRepeatButton>
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<Track.IncreaseRepeatButton>
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<RepeatButton Command="{x:Static ScrollBar.PageRightCommand}" Style="{StaticResource HorizontalScrollBarPageButton}"/>
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</Track.IncreaseRepeatButton>
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<Track.Thumb>
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<Thumb Style="{StaticResource ScrollBarThumb}" />
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</Track.Thumb>
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</Track>
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</Grid>
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<ControlTemplate.Triggers>
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<Trigger Property="IsEnabled" Value="false">
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<Setter Property="Background" TargetName="Bg" Value="{StaticResource ScrollBarDisabledBackground}"/>
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</Trigger>
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</ControlTemplate.Triggers>
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</ControlTemplate>
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</Setter.Value>
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</Setter>
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</Trigger>
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</Style.Triggers>
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</Style>
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</ResourceDictionary>
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2、在窗口中引用资源字典
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<Window.Resources>
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<ResourceDictionary>
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<ResourceDictionary.MergedDictionaries>
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<ResourceDictionary Source="ScrollViewDictionary.xaml" />
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</ResourceDictionary.MergedDictionaries>
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</ResourceDictionary>
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</Window.Resources>
3、scrollViewer中使用新样式
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<ScrollViewer Template="{StaticResource MyScrollViewer}" Grid.Column="0" Grid.Row="1" VerticalAlignment="Top" Grid.ColumnSpan="2" x:Name="scrList" Margin="0" VerticalScrollBarVisibility="Auto" Height="350" Width="250">
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<StackPanel Orientation="Vertical" Name="layerList" ScrollViewer.VerticalScrollBarVisibility="Visible" Width="250" >
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</StackPanel>
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</ScrollViewer>
自定义完成，以上是所有步骤和代码，可以根据自己程序的整体设计来更改颜色、宽度、圆角等效果。