这个问题很难以清楚的方式提出。但是，我会尽力而为...
标题中的“滚动条背景”是指如下图所示的轨道区域（从https://www.codeproject.com/Articles/41787/Creating-a-Blend-like-Scrollbar明显被盗）。
显然，stackoverflow不允许我嵌入图像。因此，我希望上面的链接有效。
此外，标题中的“动态”一词并不意味着将一个资源映像换成另一个。这意味着在内存中创建图像，然后在运行时将其分配给滚动条。
我整理了一个简单的项目来演示我正在尝试做的事情。这是屏幕截图。
等等！停止。请不要建议我“处理”到Winmerge之类的第三方应用程序。请记住，这只是一个演示应用程序，可帮助您传达想法。我的真实应用程序没有比较文本文件，尽管最终结果将非常相似。
这是我的演示应用程序的XAML的一部分。
<Grid>
<DataGrid Name="dgDiffs" AutoGenerateColumns="False">
<DataGrid.Resources>
<Style TargetType="ScrollBar">
<Setter Property="Background">
<Setter.Value>
<!--<ImageBrush ImageSource="{Binding overview}" />-->
<ImageBrush ImageSource="overview.png" />
</Setter.Value>
如您所见，我已经为演示（overview.png）进行了硬编码。您还可以看到我试图将图像源绑定到C＃中的对象的位置。我的想法是我以编程方式创建一个显示概述的位图，然后更新滚动条。
这就是我被困住的地方。我尝试创建简单的位图对象并用纯色填充它们，但是它们没有出现在我的滚动条上。我什至不确定我是否会采用正确的方法。
这是我的演示代码，试图使用位图对象。
public partial class MainWindow : Window {
class DiffItem {
public int diff { get; set; } // used to color grid row (highlight differences)
public string leftString { get; set; }
public string rightString { get; set; }
}
public MainWindow() {
InitializeComponent();
// build a lengthy list for demonstration
List<DiffItem> diffList = new List<DiffItem>();
for (int i = 0; i < 10; i++) {
// I've chopped out a bunch of lines here. This just builds a long repeating list for the demo
diffList.Add(new DiffItem() { diff = 0, leftString = "one", rightString = "one" });
diffList.Add(new DiffItem() { diff = -1, leftString = "four", rightString = "" });
diffList.Add(new DiffItem() { diff = 1, leftString = "", rightString = "eight" });
diffList.Add(new DiffItem() { diff = 2, leftString = "eleven", rightString = "elven" });
diffList.Add(new DiffItem() { diff = 0, leftString = "sixteen", rightString = "sixteen" });
}
// display list
dgDiffs.ItemsSource = diffList;
// update scrollbar overview
Bitmap overview = new Bitmap(20, 200);
using (Graphics g = Graphics.FromImage(overview)) {
g.Clear(Color.Green);
}
}
}
这是XAML试图绑定滚动条的图像源。
<Grid>
<DataGrid Name="dgDiffs" AutoGenerateColumns="False">
<DataGrid.Resources>
<Style TargetType="DataGridRow">
<Style.Triggers>
<DataTrigger Binding="{Binding diff}" Value="2">
<Setter Property="Background" Value="Orange" />
</DataTrigger>
<DataTrigger Binding="{Binding diff}" Value="1">
<Setter Property="Background" Value="LightGreen" />
</DataTrigger>
<DataTrigger Binding="{Binding diff}" Value="-1">
<Setter Property="Background" Value="OrangeRed" />
</DataTrigger>
</Style.Triggers>
</Style>
<Style TargetType="ScrollBar">
<Setter Property="Background">
<Setter.Value>
<ImageBrush ImageSource="{Binding overview}" />
<!--<ImageBrush ImageSource="overview.png" />-->
</Setter.Value>
</Setter>
</Style>
</DataGrid.Resources>
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding leftString}" Width="200"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding rightString}" Width="*"></DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
答案 0 :(得分：0)
万一有人想知道...这是怎么做。
XAML
<Grid>
<DataGrid Name="dgDiffs" AutoGenerateColumns="False">
<DataGrid.Resources>
<Style TargetType="DataGridRow">
<Style.Triggers>
<DataTrigger Binding="{Binding diff}" Value="2">
<Setter Property="Background" Value="Orange" />
</DataTrigger>
<DataTrigger Binding="{Binding diff}" Value="1">
<Setter Property="Background" Value="LightGreen" />
</DataTrigger>
<DataTrigger Binding="{Binding diff}" Value="-1">
<Setter Property="Background" Value="OrangeRed" />
</DataTrigger>
</Style.Triggers>
</Style>
<Style TargetType="ScrollBar">
<Setter Property="Background">
<Setter.Value>
<ImageBrush ImageSource="{Binding Path=overview}" />
<!--<ImageBrush ImageSource="overview.png" />-->
</Setter.Value>
</Setter>
</Style>
</DataGrid.Resources>
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding leftString}" Width="200"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding rightString}" Width="*"></DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
C＃
public partial class MainWindow : Window {
class DiffItem {
public int diff { get; set; } // used to color grid row (highlight differences)
public string leftString { get; set; }
public string rightString { get; set; }
}
public BitmapImage overview { get; set; }
public MainWindow() {
InitializeComponent();
DataContext = this;
// build a lengthy list for demonstration
List<DiffItem> diffList = new List<DiffItem>();
for (int i = 0; i < 10; i++) {
diffList.Add(new DiffItem() { diff = 0, leftString = "one", rightString = "one" });
diffList.Add(new DiffItem() { diff = 0, leftString = "two", rightString = "two" });
diffList.Add(new DiffItem() { diff = 0, leftString = "three", rightString = "three" });
diffList.Add(new DiffItem() { diff = -1, leftString = "four", rightString = "" });
diffList.Add(new DiffItem() { diff = 0, leftString = "five", rightString = "five" });
diffList.Add(new DiffItem() { diff = 0, leftString = "six", rightString = "six" });
diffList.Add(new DiffItem() { diff = 0, leftString = "seven", rightString = "seven" });
diffList.Add(new DiffItem() { diff = 1, leftString = "", rightString = "eight" });
diffList.Add(new DiffItem() { diff = 0, leftString = "nine", rightString = "nine" });
diffList.Add(new DiffItem() { diff = 0, leftString = "ten", rightString = "ten" });
diffList.Add(new DiffItem() { diff = 2, leftString = "eleven", rightString = "elven" });
diffList.Add(new DiffItem() { diff = 2, leftString = "twelv", rightString = "twelve" });
diffList.Add(new DiffItem() { diff = 0, leftString = "thirteen", rightString = "thirteen" });
diffList.Add(new DiffItem() { diff = 0, leftString = "fourteen", rightString = "fourteen" });
diffList.Add(new DiffItem() { diff = 0, leftString = "fifteen", rightString = "fifteen" });
diffList.Add(new DiffItem() { diff = 0, leftString = "sixteen", rightString = "sixteen" });
}
// display list
dgDiffs.ItemsSource = diffList;
// create the overview bitmap
Bitmap bmp = new Bitmap(20, 200, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
using (Graphics g = Graphics.FromImage(bmp)) {
Pen greenPen = new Pen(Color.Green, 1);
g.Clear(Color.White);
g.DrawLine(greenPen, 0, 50, 20, 50);
}
MemoryStream memoryStream = new MemoryStream();
bmp.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Bmp);
// load scrollbar with overview
overview = new BitmapImage();
overview.BeginInit();
overview.StreamSource = memoryStream;
overview.EndInit();
overview.Freeze();
}
}