Labels not showing for Graphics in GraphicOverlay

ViktorSafar

Here is my label definition 

    public LabelDefinition GetLabelDefinition()
    {
        var textSymbol = new TextSymbol
        {
            Color = System.Drawing.Color.Black,
            Size = 40,
            FontWeight = FontWeight.Bold,
            HaloColor = System.Drawing.Color.White,
            HaloWidth = 3,
        };
        var def = new LabelDefinition(new SimpleLabelExpression("Ahoj"), textSymbol)
        {
            Placement = Esri.ArcGISRuntime.ArcGISServices.LabelingPlacement.PointCenterRight,
            MinScale = 0,
            MaxScale = double.MaxValue,
        };

        return def;
    }

Here is my overlay 

_workOrdersOverlay = new GraphicsOverlay
{
	Id = AppConstants.WorkOrdersLayerId,
	Renderer = _workOrdersLayerService.GetRenderer(),
	LabelsEnabled = true,
};
_workOrdersOverlay.LabelDefinitions.Add(_workOrdersLayerService.GetLabelDefinition());

Here is my overlay with Graphics and no labels.

If I click on one of the symbols and inspect the result of GeoViewController.IdentifyGraphicsOverlaysAsync I can see the overlay labeling is correctly configured

resultsPerOverlay.First().GraphicsOverlay.LabelsEnabled
true
resultsPerOverlay.First().GraphicsOverlay.LabelDefinitions.First().Expression
{Esri.ArcGISRuntime.Mapping.Labeling.SimpleLabelExpression}
    Expression: "Ahoj"

 

What am I missing?

 

pnarkhede

Hi @ViktorSafar,

Thank you for providing the repro.

The issue with labels not displaying in your GraphicsOverlay appears to be related to how the label expression is defined. When using a SimpleLabelExpression with static text like "Ahoj" or "Some text", the labels won't display because the expression isn't properly linked to attributes in your graphics.

For labels to display correctly in a GraphicsOverlay, you need to:

 

1. Make sure your label expression references an attribute that exists in your graphics. Instead of:

new SimpleLabelExpression("Some text")

Try using:

new SimpleLabelExpression("[name]")

 

2. Ensure your graphics have the corresponding attribute populated:

var g = new Graphic() { Geometry = new MapPoint(0, 0) };
g.Attributes.Add("name", "Homer");

 

These changes should help your labels display correctly. Let me know If you have any further questions or need additional assistance.

 

 

Regards,

Prathamesh