CreateLegend Method—ArcGIS Pro

Creates a legend element on a layout from an envelope geometry. This method must be called on the MCT. Use QueuedTask.Run.

Syntax

C#
Visual Basic (Declaration)

Legend CreateLegend( 
   ILayoutElementContainer elementContainer,
   Envelope envelope,
   MapFrame mapFrame
)

Function CreateLegend( _
   ByVal elementContainer As ILayoutElementContainer, _
   ByVal envelope As Envelope, _
   ByVal mapFrame As MapFrame _
) As Legend

Parameters

elementContainer: Layout or GroupElement
envelope: Envelope
mapFrame: MapFrame

Return Value

Returns a Legend.

Exceptions

Exception	Description
ArcGIS.Core.CalledOnWrongThreadException	This method or property must be called within the lambda passed to QueuedTask.Run.

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 legend for an associated map frame.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2D envelope geometry
  Coordinate2D leg_ll = new Coordinate2D(6, 2.5);
  Coordinate2D leg_ur = new Coordinate2D(8, 4.5);
  Envelope leg_env = EnvelopeBuilder.CreateEnvelope(leg_ll, leg_ur);

  //Reference MF, create legend and add to layout
  MapFrame mapFrame = layout.FindElement("New Map Frame") as MapFrame;
  if (mapFrame == null)
  {
    ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("Map frame not found", "WARNING");
    return;
  }
  Legend legendElm = LayoutElementFactory.Instance.CreateLegend(layout, leg_env, mapFrame);
  legendElm.SetName("New Legend");
});

Requirements

Target Platforms: Windows 10, Windows 8.1

Reference

IElementFactory Interface
IElementFactory Members