I have same issue as mentioned in this question long back. Return Custom ValidationResult and access it from controller in Asp.Net Core
But it didn't concluded with an answer. Please suggest a way to get CustomValidationResult into ModelState of controller. Note: I am not trying to create new action filters. i am trying to work with ValidationResult, ValidationAttribute and ModelState.
i created a class for
CustomValidationResult : ValidationResult
Using this in my custom attribute
Mandatory : RequiredAttribute
This is not reflecting back to controller level ModelState for further validation.