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How to add annotations by using MVVM binding?

Platform: UWP |
Control: SfChart |
Published Date: January 27, 2016 |
Last Revised Date: June 27, 2019

Description:

Annotations are used to mark specific area of interest on the chart area. The 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 that to the AnnotationCollection property in the ViewModel. Then, you should 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);

The following screenshot displays the chart with vertical line annotation.

Output

Annotation added through MVVM binding in WPF

Figure 1: Vertical line annotation.

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