ArcGIS Pro 2.9 API Reference Guide
LegendItem Property
Example 

ArcGIS.Desktop.Mapping Namespace > LegendItemStyleItem Class : LegendItem Property
Gets or sets the ArcGIS.Core.CIM.CIMLegendItem of the legend item style item.
Syntax
public CIMLegendItem LegendItem {get; set;}
Public Property LegendItem As CIMLegendItem
Exceptions
ExceptionDescription
This property must be called within the lambda passed to QueuedTask.Run
Example
LegendItemStyleItem legendItemStyleItem = null;
CIMLegendItem legendItem = await QueuedTask.Run<CIMLegendItem>(() =>
{
  return legendItemStyleItem.LegendItem;
});
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

See Also

Reference

LegendItemStyleItem Class
LegendItemStyleItem Members