Polygon Label features dont show

ofirrosner

Hello

I'm using this guide
with the example from JsonLabelClass. 
When i add a polygon and i want to add text to it with PolygonAlwaysHorizontal no text is showing.

But when I'm using any of the line options(e.g LineAboveBefore) it will show my text(not in the optimal way) but something i shown

why the polygon one is not showing and how can i overcome it?

ThadTilton

I think you're just missing the quotes around the guid value: 

WhereClause = $"GUID LIKE '{guid}'"

 

Here's the code that worked for me:

private async void CreatePolyButton_Click(object sender, Microsoft.UI.Xaml.RoutedEventArgs e)
{
    var poly = await MyMapView.SketchEditor.StartAsync(SketchCreationMode.Polygon, false);
    string guid = Guid.NewGuid().ToString();
    var attr = new Dictionary<string, object>
    {
        { "GUID", guid }
    };
    var graphic = new Graphic(poly, attr);
    _overlay.Graphics.Add(graphic);

    var labelDef = GetGraphicLabelDef(System.Drawing.Color.Firebrick, guid);
    _overlay.LabelDefinitions.Clear();
    _overlay.LabelsEnabled = true;
    _overlay.LabelDefinitions.Add(labelDef);
}

private LabelDefinition GetGraphicLabelDef(System.Drawing.Color color, string guid)
{
    // Create a text symbol for styling the label.
    TextSymbol textSymbol = new TextSymbol
    {
        Size = 12,
        FontFamily = "Arial",
        Color = color,
        HaloColor = Color.White,
        HaloWidth = 2,
    };

    // Create a label expression using an Arcade expression script.
    LabelExpression arcadeLabelExpression = new ArcadeLabelExpression("$feature.GUID");

    // Create a new LabelInfo object and set the relevant properties (including the text symbol).
    var labelInfo = new LabelClassInfo(GeometryType.Polygon)
    {
        LabelPosition = LabelPosition.Static,
        ArcadeExpression = arcadeLabelExpression.Expression,
        MinScale = 0,
        MaxScale = 0,
        LabelPlacement = LabelPlacement.PolygonAlwaysHorizontal,
        Priority = 30,
        RemoveDuplicateLabels = DuplicateLabels.FeatureType,
        StackLabel = true,
        Symbol = textSymbol,
        WhereClause = $"GUID LIKE '{guid}'"
    };

    // Get the raw JSON from the label info object.
    string labelJson = labelInfo.ToJson();

    // Create a new label definition from the JSON string.
    LabelDefinition labelDef = LabelDefinition.FromJson(labelJson);
    return labelDef;
}