How to add annotations by using mvvm binding in WPF Chart (SfChart)?

Description:

Annotations are used to mark specific areas of interest on a chart. The WPF Chart (SfChart) allows you to add annotations by using MVVM binding. This article describes how to add annotations.

Solution:

You can create an annotation and add it to the AnnotationCollection property in the ViewModel. Then, bind that property to the Annotations property of the chart as illustrated in the following code example.

XAML

<!—Annotations in MVVM pattern-->
<chart:SfChart  x:Name="chart" 
                Series="{Binding Path=chartSeries}" 
                Annotations="{Binding Path=chartAnnotation}">
</chart:SfChart>

 C#

public AnnotationCollection chartAnnotation
{
    get;
    set;
}
//Adding Annotations.
chartAnnotation = new AnnotationCollection();
VerticalLineAnnotation verticalLineAnnotation = new VerticalLineAnnotation();
verticalLineAnnotation.ShowAxisLabel = true;
verticalLineAnnotation.CoordinateUnit = CoordinateUnit.Axis;
verticalLineAnnotation.X1 = new DateTime(2005, 01, 01).ToOADate();
chartAnnotation.Add(verticalLineAnnotation);

 Output:

The output will display annotations on the specified area of the chart.

Conclusion

I hope you enjoyed learning how to add annotations using MVVM binding in a WPF Chart.

You can refer to our WPF Chart feature tour page 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 Examples to understand how to create and manipulate data.

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