LoadFamily Method Exceptions

[ahmadmahrous_1]

As per API Documentation for: LoadFamily Method (Document, IFamilyLoadOptions) at this page:

https://www.revitapidocs.com/2021.1/cb950c8e-f440-c6db-8563-d1dd16ef3fee.htm 

Autodesk.Revit.Exceptions InvalidOperationException may be raised when "the load was cancelled due to a conflict and a False return from one of the interface methods".

What is this mean?

Thank you

[bhprest]

Someone please correct me if this is wrong.

LoadFamily() takes two arguments:

1. a target document
2. class that inherits from the IFamilyLoadOptions interface

The IFamilyLoadOptions interface has two methods, both have a bool return value. Revit uses these two methods to execute some user-defined code prior to loading the family. This exception will be thrown if either of these methods return false.

Hope this helps.