WPF工具包图表-自定义工具提示-显示复杂的依存值

Question

I have the following chart:

<cht:Chart ...>
    <cht:Chart.Series>
        <cht:LineSeries Name="LineSeries" Title="a"
            DependentValueBinding="{Binding Path=Value}"
            IndependentValueBinding="{Binding Path=Key}"
            ItemsSource="{Binding Path=SourceCollection}"
            IsSelectionEnabled="True"
            DataPointStyle="{DynamicResource SmallPointStyle}">
       </cht:LineSeries>
   </cht:Chart.Series>
</cht:Chart>

And the DataPointStyle:

<Style TargetType="cht:LineDataPoint"> 
    <Setter Property="Width" Value="2" />
    <Setter Property="Height" Value="2" />
    <Setter Property="DependentValueStringFormat" Value="{}{0:0.00}"/>
</Style>
<Style x:Key="SmallPointStyle" TargetType="cht:LineDataPoint" BasedOn="{StaticResource {x:Type cht:LineDataPoint}}">
    <Setter Property="BorderBrush" Value="Orange"/>
    <Setter Property="Background" Value="Orange"/>
</Style>

The source collection is a list of KeyValuePair. The application works fine.

I encountered a problem because i want to use a collection of KeyValuePair> where doubleA is the data extracted and the doubleB is a normalised value of doubleA, based on a range. so i need to change the LineSeries to be:

<cht:Chart ...>
    <cht:Chart.Series>
        <cht:LineSeries Name="LineSeries" Title="a"
        DependentValueBinding="{Binding Path=Value.Value}"
        IndependentValueBinding="{Binding Path=Key}"
        ItemsSource="{Binding Path=SourceCollection}"
        IsSelectionEnabled="True"
        DataPointStyle="{DynamicResource SmallPointStyle}">
       </cht:LineSeries>
    </cht:Chart.Series>
</cht:Chart>

It works as i expected, but i need to show in the tooltip the real value (Value.Key), not the DependentValue. is there anyway to accomplish that?

Answer 1

See this blog post for one possible solution.

You find the LineSeries data point style that you have to override here . However, keep in mind that when you override the template you will not get any random colors anymore.

Good luck!