Assembly: RevitAPI (in RevitAPI.dll) Version: 18.104.22.168 (22.214.171.124)
The event arguments provide access to the FailuresAccessor via GetFailuresAccessor which contains the details of the errors and/or warnings that caused the event to trigger.
The arguments also allow you to set a processing result via SetProcessingResult(FailureProcessingResult) . The processing result determines if Revit will attempt to recommit the currently failing transaction, roll it back, or continue. If you are explicitly dismissing warnings from the event callback, a processing result of Continue is sufficient. But if you are explicitly resolving errors from the event callback, you must change the processing result to ProceedWithCommit to ensure that the user is not shown the dismissed errors. If you wish to cancel the transaction silently without showing the errors to the user, set the processing result to ProceedWithRollback, however you must also call SetClearAfterRollback(Boolean) in order to dismiss the errors and silently cancel the transaction.