ArcGIS Pro 2.6 API Reference Guide
CreateRectangleGraphicElement Method (LayoutElementFactory)
Example 

ArcGIS.Desktop.Layouts Namespace > LayoutElementFactory Class : CreateRectangleGraphicElement Method
Layout or GroupElement
Envelope
CIMPolygonSymbol
Creates a graphic rectangle element on a layout from a single envelope geometry. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
Public Function CreateRectangleGraphicElement( _
   ByVal elementContainer As ILayoutElementContainer, _
   ByVal envelope As Envelope, _
   Optional ByVal polygonSymbol As CIMPolygonSymbol _
) As GraphicElement

Parameters

elementContainer
Layout or GroupElement
envelope
Envelope
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 simple 2D rectangle graphic and apply simple fill and outline symbols.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2D envelope geometry
  Coordinate2D rec_ll = new Coordinate2D(1.0, 4.75);
  Coordinate2D rec_ur = new Coordinate2D(3.0, 5.75);
  Envelope rec_env = EnvelopeBuilder.CreateEnvelope(rec_ll, rec_ur);

  //Set symbolology, create and add element to layout
  CIMStroke outline = SymbolFactory.Instance.ConstructStroke(ColorFactory.Instance.BlackRGB, 5.0, SimpleLineStyle.Solid);
  CIMPolygonSymbol polySym = SymbolFactory.Instance.ConstructPolygonSymbol(ColorFactory.Instance.GreenRGB, SimpleFillStyle.DiagonalCross, outline);
  GraphicElement recElm = LayoutElementFactory.Instance.CreateRectangleGraphicElement(layout, rec_env, polySym);
  recElm.SetName("New Rectangle");
});
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

LayoutElementFactory Class
LayoutElementFactory Members