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  • Bo Jacobsen 610 posts 2409 karma points
    Jan 05, 2021 @ 08:29
    Bo Jacobsen
    0

    Inject custom service into custom DataAnnotation

    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.

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  • Bo Jacobsen 610 posts 2409 karma points
    Jan 05, 2021 @ 09:42
    Bo Jacobsen
    0

    This works. But is it the right way to do it?

    using Umbraco.Core.Composing;
using Umbraco.Core;

public class CustomValidationAttribute : ValidationAttribute
{
    private readonly ICustomService CustomService;

    public CustomValidationAttribute()
    {
        CustomService = Current.Factory.GetInstance<ICustomService>();
    }

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

        return new ValidationResult(ErrorMessage);
    }
}
    Copy Link
  • Bo Jacobsen 610 posts 2409 karma points
    Oct 12, 2023 @ 11:43
    Bo Jacobsen
    0

    It seems like you also could use the validationContext to get a service by using Microsoft.Extensions.DependencyInjection like 

    public class CustomValidationAttribute : ValidationAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        var customService = validationContext.GetService<ICustomService>();
        if (customService.DoSomeThing(value))
        {
            return ValidationResult.Success;
        }

        return new ValidationResult(ErrorMessage);
    }
}
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