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BackgroundTaskCancelledException

Class
Description:
The exception thrown when Revit cancels a background operation. Third-party developers are not expected to catch and handle this exception. Instead, if allowed to propagate back to Revit code, it will be handled by Revit.
Inheritance Hierarchy:
System.Object
  System.Exception
    Autodesk.Revit.Exceptions.ApplicationException
      Autodesk.Revit.Exceptions.BackgroundTaskCancelledException
Syntax
[SerializableAttribute]
public class BackgroundTaskCancelledException : ApplicationException