ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.CIM Namespace / MaplexLineFeatureType Enumeration
Example Example Version

MaplexLineFeatureType Enumeration
Maplex line feature types.
Syntax
Members
MemberDescription
Contour Contour labeling.
General General line labeling.
River River labeling.
Street Street labeling.
StreetAddressRange Street address labeling.
Example
Modify the Placement/Position of labels - Line 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
  var lineLablePosition = new CIMStandardLineLabelPosition
  {
    Perpendicular = true,
    Parallel = false,
    ProduceCurvedLabels = false,
    Horizontal = false,
    OnTop = true
  };
  theLabelClass.StandardLabelPlacementProperties.LineLabelPosition = 
      lineLablePosition;
}
else //Current labeling engine is Maplex labeling engine
{
  theLabelClass.MaplexLabelPlacementProperties.LinePlacementMethod = 
                MaplexLinePlacementMethod.CenteredPerpendicularOnLine;
  theLabelClass.MaplexLabelPlacementProperties.LineFeatureType = 
                MaplexLineFeatureType.General;
}
//theLabelClass.MaplexLabelPlacementProperties.LinePlacementMethod = MaplexLinePlacementMethod.CenteredPerpendicularOnLine;
lyrDefn.LabelClasses = listLabelClasses.ToArray(); //Set the labelClasses back
featureLayer.SetDefinition(lyrDefn); //set the layer's definition
Inheritance Hierarchy

System.Object
   System.ValueType
      System.Enum
         ArcGIS.Core.CIM.MaplexLineFeatureType

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also