Wpf 自定义滚动条样式模板

【实例简介】参考网上资料，进行修改。定义了有上下按钮和无上下按钮2种滚动条样式模板，
每种滚动条定义7或8副图像，
半透明和无按钮的滚动条需Scrollbackground(x).png图像,上下按钮为全透明图像即可。
添加样式：
1、替换(x)为数字，例如(3),添加相应的图片到资源
2、调整滚动块高度和上下位置距离：
<Track.Thumb>
<Thumb Style="{StaticResource ThumbStyle(2)}" 
    Height="79"
    Margin="-1,0,-1,0" />
</Track.Thumb>

设置上下按钮高度
<Grid x:Name="Bg"
    Background="{TemplateBinding Background}"
    SnapsToDevicePixels="true">
    <Grid.RowDefinitions>
       <RowDefinition MaxHeight="39" />
       <RowDefinition Height="0.00001*" />
       <RowDefinition MaxHeight="39" />
    </Grid.RowDefinitions>

如无上下按钮，则设置
<ImageBrush x:Key="ScrollBackground(x)" 
 TileMode="FlipY" 
ImageSource="/Resource_ScrollImage/Scrollbackground(1).png" />
......
<ControlTemplate TargetType="{x:Type ScrollBar}">
<Grid x:Name="Bg"
Background="{DynamicResource ScrollBackground(1)}"
SnapsToDevicePixels="true">
......

背景透明
<ScrollBar x:Name="PART_VerticalScrollBar"

 Background="Transparent"

【实例截图】

【核心代码】

public partial class MainWindow : Window
    {
        bool change;
        public string fontFace = Environment.CurrentDirectory   @"\中文字体.ttf#萝莉体 第二版";
        Grid scrollGrid;
        ScrollViewer scrollViewer;
        TextBlock textBlock;

        public MainWindow()
        {
            InitializeComponent();
            ImageBrush background = new ImageBrush();
            background.ImageSource = new BitmapImage(new Uri(Environment.CurrentDirectory   @"\background.jpg"));
            background.Stretch = Stretch.Fill;
            this.Background = background;

            scrollGrid = (Grid)XamlToObj (@"
                <Grid xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
                    Name='scrollGrid' 
                    HorizontalAlignment='Left' 
                    VerticalAlignment='Top' 
                    Margin='5' 
                    Height='360' 
                    Width='320'/>"
            );
            scrollViewer = (ScrollViewer)XamlToObj(@"
                <ScrollViewer xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
                    Name='scrollViewer'
                    HorizontalAlignment='Stretch' 
                    VerticalAlignment='Stretch'
                    Margin='0' 
                    Focusable='false'>
                </ScrollViewer>
            ");

            textBlock = (TextBlock)XamlToObj(@"
                <TextBlock xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
                    Name='textBlock'
                    HorizontalAlignment='Stretch' 
                    VerticalAlignment='Stretch'
                    FontFamily='"  fontFace   @"'
                    FontSize='20'
                    Foreground='White'
                    Margin ='0' 
                    TextWrapping = 'Wrap' 
                    Text='"   Res_Content.conter_1.Replace("\n", "&#x0a;&#x0d;").Replace("\r", "&#x0a;&#x0d;")   @"'>
                    <TextBlock.Effect>
                        <DropShadowEffect Color='Black' BlurRadius='5' Opacity='0.8'></DropShadowEffect>
                    </TextBlock.Effect >
                </TextBlock>
            ");

            scrollViewer.Template = Resources["ScrollViewerControlTemplate(1)"] as ControlTemplate;
            scrollViewer.Content = textBlock;
            scrollGrid.Children.Add(scrollViewer);
            GridMain.Children.Add(scrollGrid);

            change = true;
        }


        public object XamlToObj(string xaml)
        {
            string strXaml = xaml;
            StringReader strreader = new StringReader(strXaml);
            XmlTextReader xmlreader = new XmlTextReader(strreader);
            object obj = XamlReader.Load(xmlreader);
            return obj;
        }

        private void btn_change_Click(object sender, RoutedEventArgs e)
        {
            change = !change;
            if (change) scrollViewer.Template = Resources["ScrollViewerControlTemplate(1)"] as ControlTemplate;
            else scrollViewer.Template = Resources["ScrollViewerControlTemplate(2)"] as ControlTemplate;
        }
    }