How to Collapse the Visibility of Specific Data Label in WPF Chart?
This article describes how to collapse the visibility of the specific data label in our WPF Charts.
You can hide the data label by using the LabelTemplate property and a converter, as shown in the following steps:
Step 1: Define a data label template for the series.
<DataTemplate x:Key="labelTemplate">
<StackPanel Orientation="Vertical"
Background="{Binding Interior}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="XValue:" />
<TextBlock Text="{Binding XData}" />
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock Text="YValue: " />
<TextBlock Text="{Binding YData}" />
</StackPanel>
</StackPanel>
</DataTemplate>
Step 2: Create a value to visibility converter to control the visibility of the data label based on the Y-value. For example, in the following converter, we have collapsed the visibility of the data label for values less than 50.
public class VisibilityConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, string language)
{
var labelValue = (double)value;
if (labelValue < 50)
return Visibility.Collapsed;
return Visibility.Visible;
}
public object ConvertBack(object value, Type targetType, object parameter, string language)
{
return value;
}
}
Step 3: To control the visibility, bind the converter to the DataTemplate Visibility property.
<chart:SfChart.Resources>
<local:VisibilityConverter x:Key="visibilityConverter"/>
<DataTemplate x:Key="labelTemplate">
<StackPanel Orientation="Vertical"
Visibility="{Binding YData,Converter={StaticResource visibilityConverter}}"
Background="{Binding Interior}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="XValue:" />
<TextBlock Text="{Binding XData}" />
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock Text="YValue: " />
<TextBlock Text="{Binding YData}" />
</StackPanel>
</StackPanel>
</DataTemplate>
</chart:SfChart.Resources>
Step 4: Set the defined DataTemplate to the LabelTemplate property of ChartAdornmentInfo in the series.
<chart:SfChart x:Name="chart" Header="Efficiency of oil-fired power production">
. . .
<chart:ColumnSeries XBindingPath="XValue"
YBindingPath="Y1Value" Palette="Custom"
ItemsSource="{Binding Data}">
<chart:ColumnSeries.AdornmentsInfo>
<chart:ChartAdornmentInfo SegmentLabelContent="LabelContentPath"
ShowLabel="True" LabelPosition="Outer" LabelTemplate="{StaticResource labelTemplate}">
</chart:ChartAdornmentInfo>
</chart:ColumnSeries.AdornmentsInfo>
</chart:ColumnSeries>
</chart:SfChart>
Output
See also
How to draw dotted line in WPF Chart?
How to display chart area alone in WPF Chart (SfChart)?
How to display trackball label or tooltip over chart annotation?
Conclusion
I hope you enjoyed learning about how to collapse the visibility of specific data label in WPF Chart.
You can refer to our WPF Chart feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our WPF Chart example to understand how to create and manipulate data.
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