WPF图表自定义工具提示绑定

Question

我有一个动态绑定BarSeries的WPF图表。 我想让BarSeries显示3条信息。 我想在任何给定数据点的工具提示中显示第三条信息。

有什么方法可以为我的barseries中的给定数据点动态绑定工具提示的值/内容？

XAML：

<UserControl.Resources>
    <Style
       x:Key="SimpleDataPointStyle"
       BasedOn="{StaticResource {x:Type chartingToolkit:BarDataPoint}}"
       TargetType="{x:Type chartingToolkit:BarDataPoint}">
        <Setter Property="Width" Value="20"/>
        <Setter Property="Height" Value="20"/>
        <Setter x:Name="DataPointToolTip" Property="ToolTip" Value="{Binding Path=Event_Description}"/>
    </Style>
</UserControl.Resources>
<Grid x:Name="MetricsPanel" Width="904" Height="376" HorizontalAlignment="Left" VerticalAlignment="Top">   
    <chartingToolkit:Chart x:Name="MetricChart" HorizontalAlignment="Left" Width="464" Height="352" VerticalAlignment="Top">
        <chartingToolkit:Chart.Series>
            <chartingToolkit:BarSeries x:Name="MainSeries"
                                       Title="Contribution to Risk and Errors (%)"
                                       IndependentValueBinding="{Binding}"
                                       DependentValueBinding="{Binding}">
                <chartingToolkit:BarSeries.DataPointStyle>
                    <Style
                        BasedOn="{StaticResource SimpleDataPointStyle}"
                        TargetType="{x:Type chartingToolkit:BarDataPoint}">  
                    </Style>
                </chartingToolkit:BarSeries.DataPointStyle>

            </chartingToolkit:BarSeries>
        </chartingToolkit:Chart.Series>
    </chartingToolkit:Chart>

代码隐藏

maximumWeightedEvents = BuildHighestWeightedEventsTable（）;

        MainSeries.DependentValueBinding = new Binding("Cutset_Frequency");
        MainSeries.IndependentValueBinding = new Binding("Event_Number");
        MainSeries.ItemsSource = highestWeightedEvents.DefaultView;
        Style dataPointStyle = (Style)Resources["SimpleDataPointStyle"];
        MainSeries.DataPointStyle = dataPointStyle;

如何在后面的代码中为工具提示指定绑定？

预先感谢...

Answer 1

昨晚我实际上通过完全重新定义BarDataPoint的模板解决了自己的问题。

样式XAML：

<Style x:Key="NewDataPointStyle" TargetType="chartingToolkit:BarDataPoint">
<Setter Property="Background" Value="SteelBlue" />
<Setter Property="IsTabStop" Value="False" />
<Setter Property="BorderBrush" Value="#FF686868" />
<Setter Property="Width" Value="20" />
<Setter Property="Height" Value="20" />
<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="chartingToolkit:BarDataPoint">
            <Grid x:Name="Root" Opacity="1">
                <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>
                                <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="MouseOverHighlight" Storyboard.TargetProperty="(UIElement.Opacity)">
                                    <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0.3" />
                                </DoubleAnimationUsingKeyFrames>
                            </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>
                                <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="SelectionHighlight" Storyboard.TargetProperty="(UIElement.Opacity)">
                                    <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0.185" />
                                </DoubleAnimationUsingKeyFrames>
                                <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="SelectionHighlight" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)">
                                    <SplineColorKeyFrame KeyTime="00:00:00" Value="#FF8A8A8A" />
                                </ColorAnimationUsingKeyFrames>
                            </Storyboard>
                        </VisualState>
                    </VisualStateGroup>
                    <VisualStateGroup x:Name="RevealStates">
                        <VisualStateGroup.Transitions>
                            <VisualTransition GeneratedDuration="0:0:0.5" />
                        </VisualStateGroup.Transitions>
                        <VisualState x:Name="Shown">
                            <Storyboard>
                                <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="Root" Storyboard.TargetProperty="(UIElement.Opacity)">
                                    <SplineDoubleKeyFrame KeyTime="00:00:00" Value="1" />
                                </DoubleAnimationUsingKeyFrames>
                            </Storyboard>
                        </VisualState>
                        <VisualState x:Name="Hidden">
                            <Storyboard>
                                <DoubleAnimation Duration="0" Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="0" />
                            </Storyboard>
                        </VisualState>
                    </VisualStateGroup>
                </VisualStateManager.VisualStateGroups>
                <ToolTipService.ToolTip>
                    <ContentControl Content="{Binding Path=Event_Description}" />
                </ToolTipService.ToolTip>
                        <StackPanel Orientation="Horizontal"
                                Background="{TemplateBinding Background}">
                        </StackPanel>
                </Grid>
        </ControlTemplate>
    </Setter.Value>
</Setter>

图表XAML：

<chartingToolkit:Chart x:Name="MetricChart" HorizontalAlignment="Left" Width="464" Height="352" VerticalAlignment="Top">
        <chartingToolkit:Chart.Axes>
            <chartingToolkit:LinearAxis Interval="10" Maximum="100" x:Name="XAxis" Orientation="X" Title="Percent Contribution (%)"/>
            <chartingToolkit:CategoryAxis Title="Event Number" Orientation="Y"/>
        </chartingToolkit:Chart.Axes>
        <chartingToolkit:Chart.Series>
            <chartingToolkit:BarSeries x:Name="MainSeries"
                                       Title="Contribution to Risk and Errors (%)"
                                       IndependentValueBinding="{Binding}"
                                       DependentValueBinding="{Binding}" BorderThickness="0" BorderBrush="Black" Background="Black" OpacityMask="Black">
                <chartingToolkit:BarSeries.DataPointStyle>
                    <Style
                        BasedOn="{StaticResource NewDataPointStyle}"
                        TargetType="{x:Type chartingToolkit:BarDataPoint}">
                    </Style>
                </chartingToolkit:BarSeries.DataPointStyle>
            </chartingToolkit:BarSeries>
        </chartingToolkit:Chart.Series>
        <chartingToolkit:Chart.LegendStyle>
            <Style TargetType="Control">
                <Setter Property="Width" Value="0"/>
                <Setter Property="Height" Value="0"/>
            </Style>
        </chartingToolkit:Chart.LegendStyle>
    </chartingToolkit:Chart>

代码隐藏：

        //highestWeightedEvents is a DataTable
        highestWeightedEvents = BuildHighestWeightedEventsTable();
        MainSeries.DependentValueBinding = new Binding("Cutset_Frequency");
        MainSeries.IndependentValueBinding = new Binding("Event_Number");
        MainSeries.ItemsSource = highestWeightedEvents.DefaultView;

由于我在后面的代码中定义了DataSeries.ItemsSource，因此ToolTip绑定知道要查找的位置。 我希望一整天弄清楚这个问题，其他人可能会从中受益：D

Answer 2

在后面的代码中，您无法即时编辑样式，因为样式在加载时会被密封。 因此，您可以从在xaml中创建的样式创建一种新样式，并添加工具提示绑定。 就像是

//your code behind
        Style newDataPointStyle = (Style)Resources["SimpleDataPointStyle"];

        newDataPointStyle.Setters.Add(
            new Setter
            {
                Property = "ToolTip",
                Value = new Binding("YourBinding")
            });
        MainSeries.DataPointStyle = newDataPointStyle;