RequiredIf conditional attribute in .net Core

Question

How to achieve RequiredIf conditional operation in .NET Core for Model based validation.

In ASP.NET MVC, had used with ExpressiveAnnotation package but its not working for .NET Core.

Answer 1

UoN.ExpressiveAnnotations.NetCore is the package used for .NET Core applications same functionality as ExpressiveAnnotation package for MVC

Reference URL: https://github.com/uon-nuget/UoN.ExpressiveAnnotations.NetCore

Answer 2

You can extend RequiredAttribute to check the property value and according to that manually check IsNullOrWhiteSpace of current property .

You can find the code sample here . Here is another code sample using custom ValidationAttribute .