ArcGIS Pro 2.7 API Reference Guide
Refresh Method (ReportView)
Example 

ArcGIS.Desktop.Reports Namespace > ReportView Class : Refresh Method
Force the report view to redraw. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public void Refresh()
Public Sub Refresh() 
Exceptions
ExceptionDescription
This method or property must be called within the lambda passed to QueuedTask.Run.
Example
if (reportView == null)
  return;

QueuedTask.Run(() =>
{
  reportView.Refresh();
});

Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

ReportView Class
ReportView Members