Hi all.

How do i Inject a custom service into a custom DataAnnotation?

I am using Umbraco version 8.9.1 and have setup a very simple test to get it going.

Interface

public interface ICustomService
{
    bool DoSomeThing(object value);
}

Service

using Umbraco.Core.Logging;

public class CustomService : ICustomService
{
    private readonly ILogger _logger;

    public CustomService(ILogger logger)
    {
        _logger = logger;
    }

    public bool DoSomeThing(object value)
    {
        return value == null;
    }
}

DataAnnotation (this do not work)

using System.ComponentModel.DataAnnotations;

public class CustomValidationAttribute : ValidationAttribute
{
    private readonly ICustomService CustomService;

    public CustomValidationAttribute(ICustomService customService)
    {
        CustomService = customService;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        if(CustomService.DoSomeThing(value))
        {
            return ValidationResult.Success;
        }

        return new ValidationResult(ErrorMessage);
    }
}

IUserComposer (Can i do something else here?)

using Umbraco.Core.Composing;

public class Installer : IUserComposer
{
    public void Compose(Composition composition)
    {
        composition.Register<ICustomService, CustomService>();
    }
}

Any thoughts and help is very appreciated.