ArcGIS Pro 3.3 API Reference Guide
ArcGIS.Core.CIM Namespace / CIMStandardLabelPlacementProperties Class / PlaceOnlyInsidePolygon Property
Example

In This Topic
    PlaceOnlyInsidePolygon Property
    In This Topic
    Gets or sets a value indicating whether or not to place the label only inside a polygon.
    Syntax
    public bool PlaceOnlyInsidePolygon {get; set;}
    Public Property PlaceOnlyInsidePolygon As Boolean
    Example
    Modify the Placement/Position of labels - Polygon geometry
    //Note: call within QueuedTask.Run()
    
    //Get the layer's definition
    var lyrDefn = featureLayer.GetDefinition() as CIMFeatureLayer;
    //Get the label classes - we need the first one
    var listLabelClasses = lyrDefn.LabelClasses.ToList();
    var theLabelClass = listLabelClasses.FirstOrDefault();
    //Modify label Placement 
    //Check if the label engine is Maplex or standard.
    CIMGeneralPlacementProperties labelEngine = MapView.Active.Map.GetDefinition().GeneralPlacementProperties;
    if (labelEngine is CIMStandardGeneralPlacementProperties)
    {
      //Current labeling engine is Standard Labeling engine
      theLabelClass.StandardLabelPlacementProperties.PolygonPlacementMethod = 
               StandardPolygonPlacementMethod.AlwaysHorizontal;
      theLabelClass.StandardLabelPlacementProperties.PlaceOnlyInsidePolygon = true;
    }
    else
    {
      //Current labeling engine is Maplex labeling engine
      theLabelClass.MaplexLabelPlacementProperties.PolygonFeatureType = 
                               MaplexPolygonFeatureType.LandParcel;
      theLabelClass.MaplexLabelPlacementProperties.AvoidPolygonHoles = true;
      theLabelClass.MaplexLabelPlacementProperties.PolygonPlacementMethod = 
                          MaplexPolygonPlacementMethod.HorizontalInPolygon;
      theLabelClass.MaplexLabelPlacementProperties.CanPlaceLabelOutsidePolygon = true;
    }
    
    lyrDefn.LabelClasses = listLabelClasses.ToArray(); //Set the labelClasses back
    featureLayer.SetDefinition(lyrDefn); //set the layer's definition
                                         //set the label's visiblity
    featureLayer.SetLabelVisibility(true);
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also