ArcGIS Pro 2.3 API Reference Guide
GetHeight Method (Element)
Example 

ArcGIS.Desktop.Layouts Namespace > Element Class : GetHeight Method
Gets the height of the element. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
Public Function GetHeight() As Double
public double GetHeight()

Return Value

Returns a Double
Exceptions
ExceptionDescription
This method must be called within the lambda passed to QueuedTask.Run.
Example
//Modify an element's hieght.

//Perform on the worker thread
await QueuedTask.Run(() =>
{
  double elmHeight = element.GetHeight();
  elmHeight = 11;

  element.SetHeight(elmHeight); //You don't have to get to set; a shortcut would be: element.SetHieght(11);
});
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

Element Class
Element Members