Custom Convenience Attributes

[szv]

It would be cool, if we could create convenience/shortcut-attributes, like in the following example:

using FluentValidation;

namespace Application.Common.Attributes;

[AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
public class RegisterValidatorAttribute<T> : RegisterScopedAttribute
    where T : class
{
    public RegisterValidatorAttribute()
    {
        ServiceType = typeof(IValidator<T>);
    }
}

for a validator class like this

[RegisterValidator<UpdatePostingCommand>]
internal class MyTypeToValidateValidator : AbstractValidator<MyTypeToValidate>
{
    // ...
}

In the case of FluentValidation, the validator class inherits AbstractValidator. When annotating the validator class with Injectio's [RegisterScoped] attribute, the validator gets registered for the type AbstractValidator<MyTypeToValidate>.
Currently it is possible to register the validator class by annotating it with [RegisterScoped(ServiceType=typeof(IValidator<MyTypeToValidate>)] or by adding the IValidator<MyTypeToValidate> explicitly to the MyTypeToValidate class.

[Misiu]

I'm registering my validators this way:

[RegisterScoped<IValidator<LoginCommand>>]
internal sealed class LoginValidator : AbstractValidator<LoginCommand>
{
    public LoginValidator()
    {
        RuleFor(x => x.UserName).NotEmpty();
        RuleFor(x => x.Password).NotEmpty();
    }
}

Does that work for you?