ArcGIS Pro 2.7 API Reference Guide
CreateCircleGraphicElement Method (LayoutElementFactory)
Example 

ArcGIS.Desktop.Layouts Namespace > LayoutElementFactory Class : CreateCircleGraphicElement Method
Layout or GroupElement
EllipticArcSegment
CIMPolygonSymbol
Creates a graphic circle element on a layout from a single elliptic arc segment geometry. This method must be called on the MCT. Use QueuedTask.Run.
Syntax

Parameters

elementContainer
Layout or GroupElement
circle
EllipticArcSegment
polygonSymbol
CIMPolygonSymbol

Return Value

Returns a GraphicElement.
Exceptions
ExceptionDescription
This method or property must be called within the lambda passed to QueuedTask.Run.
Map has reached maximum graphics count limit of 4000 elements. One or more elements cannot be created.
Map has reached maximum graphics size limit of 10 MB. One or more elements cannot be created.
Remarks
If the element container is a Layout then the element gets added to the root level of the layout TOC at the top most position. If the element container is a GroupElement then it gets added to the group at the topmost position.
Example
//Create a circle graphic element using a simple line and fill styles.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build geometry
  Coordinate2D center = new Coordinate2D(2, 4);
  EllipticArcBuilder eabCir = new EllipticArcBuilder(center, 0.5, esriArcOrientation.esriArcClockwise);
  EllipticArcSegment cir = eabCir.ToSegment();

  //Set symbolology, create and add element to layout
  CIMStroke outline = SymbolFactory.Instance.ConstructStroke(ColorFactory.Instance.BlackRGB, 2.0, SimpleLineStyle.Dash);
  CIMPolygonSymbol circleSym = SymbolFactory.Instance.ConstructPolygonSymbol(ColorFactory.Instance.RedRGB, SimpleFillStyle.Solid, outline);
  GraphicElement cirElm = LayoutElementFactory.Instance.CreateCircleGraphicElement(layout, cir, circleSym);
  cirElm.SetName("New Circle");
});
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

LayoutElementFactory Class
LayoutElementFactory Members