我记得我有一个与图表相关的资源集合的链接。
在该页面上，您可以找到可以帮助您为饼图添加标签的链接：
LabeledPieChart
此解决方案使用工具包类的派生Chart类。而且虽然我说过可以在不创建新类的情况下创建类似的行为，但我认为这并不比使用现有控件更容易。
无论如何，我可以发布显示依赖值的饼系列的自定义样式。您所需要的只是某种转换器，它将切片的路径几何转换为 的Left或 的Top属性Canvas，以及数据点的自定义样式。
转换器：
public class GeometryToNumberConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var g = value as Geometry;
var type = parameter as string;
if (type == "Left")
return (g.Bounds.Left + g.Bounds.Right) / 2.0;
else if (type == "Top")
return (g.Bounds.Top + g.Bounds.Bottom) / 2.0;
else return null;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
以及类模板中的几行xaml PieDataPoint：
<Canvas Background="Transparent">
<TextBlock Text="{TemplateBinding FormattedDependentValue}"
Canvas.Left="{Binding Geometry, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource GeometryToNumberConverter}, ConverterParameter=Left}"
Canvas.Top="{Binding Geometry, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource GeometryToNumberConverter}, ConverterParameter=Top}"/>
</Canvas>
这是PieDataPoint样式的完整代码：
<UserControl.Resources>
<local:GeometryToNumberConverter x:Name="GeometryToNumberConverter" />
<Style x:Key="LabelDataPointStyle" TargetType="chart:PieDataPoint">
<Setter Property="Background" Value="Orange"/>
<Setter Property="BorderBrush" Value="White"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="RatioStringFormat" Value="{}{0:p2}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="chart:PieDataPoint">
<Grid
x:Name="Root"
Opacity="0">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0:0:0.1"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver">
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="MouseOverHighlight"
Storyboard.TargetProperty="Opacity"
To="0.6"
Duration="0"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="SelectionStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0:0:0.1"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Unselected"/>
<VisualState x:Name="Selected">
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="SelectionHighlight"
Storyboard.TargetProperty="Opacity"
To="0.6"
Duration="0"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="RevealStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0:0:0.5"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Shown">
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="Root"
Storyboard.TargetProperty="Opacity"
To="1"
Duration="0"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Hidden">
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="Root"
Storyboard.TargetProperty="Opacity"
To="0"
Duration="0"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Path
x:Name="Slice"
Data="{TemplateBinding Geometry}"
Fill="{TemplateBinding Background}"
Stroke="{TemplateBinding BorderBrush}"
StrokeMiterLimit="1">
<ToolTipService.ToolTip>
<StackPanel>
<ContentControl Content="{TemplateBinding FormattedDependentValue}"/>
<ContentControl Content="{TemplateBinding FormattedRatio}"/>
</StackPanel>
</ToolTipService.ToolTip>
</Path>
<Path
x:Name="SelectionHighlight"
Data="{TemplateBinding GeometrySelection}"
Fill="Red"
StrokeMiterLimit="1"
IsHitTestVisible="False"
Opacity="0"/>
<Path
x:Name="MouseOverHighlight"
Data="{TemplateBinding GeometryHighlight}"
Fill="White"
StrokeMiterLimit="1"
IsHitTestVisible="False"
Opacity="0"/>
<Canvas IsHitTestVisible="False">
<TextBlock Text="{TemplateBinding FormattedDependentValue}" IsHitTestVisible="False"
Canvas.Left="{Binding Geometry, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource GeometryToNumberConverter}, ConverterParameter=Left}"
Canvas.Top="{Binding Geometry, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource GeometryToNumberConverter}, ConverterParameter=Top}"/>
</Canvas>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
您可以应用此样式：
<chart:PieSeries DataPointStyle="{StaticResource LabelDataPointStyle}" ...
图表将显示为单色橙色图表。
如果您不喜欢它，这里是我展示了如何更改Palette图表属性的链接。
这是调色板的例子，有 3 种颜色，其他颜色可以类推添加：
<datavis:ResourceDictionaryCollection x:Key="DefaultPalette">
<!-- Blue -->
<ResourceDictionary>
<RadialGradientBrush x:Key="Background" GradientOrigin="-0.1,-0.1" Center="0.075,0.015" RadiusX="1.05" RadiusY="0.9">
<GradientStop Color="#FFB9D6F7" />
<GradientStop Color="#FF284B70" Offset="1" />
</RadialGradientBrush>
<Style x:Key="DataPointStyle" TargetType="chart:PieDataPoint" BasedOn="{StaticResource LabelDataPointStyle}">
<Setter Property="Background" Value="{StaticResource Background}" />
</Style>
</ResourceDictionary>
<!-- Red -->
<ResourceDictionary>
<RadialGradientBrush x:Key="Background" GradientOrigin="-0.1,-0.1" Center="0.075,0.015" RadiusX="1.05" RadiusY="0.9">
<GradientStop Color="#FFFBB7B5" />
<GradientStop Color="#FF702828" Offset="1" />
</RadialGradientBrush>
<Style x:Key="DataPointStyle" TargetType="chart:PieDataPoint" BasedOn="{StaticResource LabelDataPointStyle}">
<Setter Property="Background" Value="{StaticResource Background}" />
</Style>
</ResourceDictionary>
<!-- Light Green -->
<ResourceDictionary>
<RadialGradientBrush x:Key="Background" GradientOrigin="-0.1,-0.1" Center="0.075,0.015" RadiusX="1.05" RadiusY="0.9">
<GradientStop Color="#FFB8C0AC" />
<GradientStop Color="#FF5F7143" Offset="1" />
</RadialGradientBrush>
<Style x:Key="DataPointStyle" TargetType="chart:PieDataPoint" BasedOn="{StaticResource LabelDataPointStyle}">
<Setter Property="Background" Value="{StaticResource Background}" />
</Style>
</ResourceDictionary>
</datavis:ResourceDictionaryCollection>
并且不要忘记DataPointStyle从系列定义中删除该属性： <chart:PieSeries DataPointStyle="{StaticResource LabelDataPointStyle}" ...
=>
<chart:PieSeries ...