ArcGIS Pro 2.7 API Reference Guide
GetDefinition Method (MapSeries)
Example 

ArcGIS.Desktop.Layouts Namespace > MapSeries Class : GetDefinition Method
Gets the CIM definition of the map series.
Syntax
public CIMMapSeries GetDefinition()
Public Function GetDefinition() As CIMMapSeries

Return Value

Returns a CIMMapSeries.
Example
//Get and modify a map series CIM definition and set the changes back to the layout

//Perform on the worker thread
await QueuedTask.Run(() =>
{
  MapSeries MS = layout.MapSeries as MapSeries;
  CIMMapSeries CIM_MS = MS.GetDefinition();
  CIM_MS.Enabled = false;
  MS.SetDefinition(CIM_MS);
  layout.SetMapSeries(MS);
});
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

MapSeries Class
MapSeries Members