ArcGIS Pro 2.8 API Reference Guide
CreateEllipseGraphicElement Method (LayoutElementFactory)
Example 

ArcGIS.Desktop.Layouts Namespace > LayoutElementFactory Class : CreateEllipseGraphicElement Method
Layout or GroupElement
EllipticArcSegment
CIMPolygonSymbol
Creates a graphic ellipse 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
ellipse
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 an ellipse graphic with simple line and fill styles.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build geometry
  Coordinate2D center = new Coordinate2D(2, 2.75);
  EllipticArcBuilder eabElp = new EllipticArcBuilder(center, 0, 1, 0.45, esriArcOrientation.esriArcClockwise);
  EllipticArcSegment ellipse = eabElp.ToSegment();

  //Set symbolology, create and add element to layout
  CIMStroke outline = SymbolFactory.Instance.ConstructStroke(ColorFactory.Instance.GreenRGB, 2.0, SimpleLineStyle.Dot);
  CIMPolygonSymbol ellipseSym = SymbolFactory.Instance.ConstructPolygonSymbol(ColorFactory.Instance.GreyRGB, SimpleFillStyle.Vertical, outline);
  GraphicElement elpElm = LayoutElementFactory.Instance.CreateEllipseGraphicElement(layout, ellipse, ellipseSym);
  elpElm.SetName("New Ellipse");
});
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

LayoutElementFactory Class
LayoutElementFactory Members