FluentValidation即服务

Question

我正在使用FluentValidation 2来验证一些实体。我想创建一个可以传递给其他服务以允许它们执行验证的IValidationService。我想像这样公开它：

public interface IValidationEngine
{
    IEnumerable<ValidationError> Validate<T>(T entity);
}

其中ValidationError是封装我的验证错误的类。理想情况下，我希望不必向我的某个服务(如OrderValidator)公开特定的验证器。我希望验证服务能够构造/找到正确的验证器。FV有没有内置的东西来定位特定类型的验证器(它会在内部缓存)？或者，我是否必须走IValidatorFactory路线，然后将每个验证器与我的IoC容器连接起来？

Answer 1

我已经设法用IValidatorFactory方法解决了这个问题。我使用的是Ninject，所以下面具体的IoC细节需要修改。

public interface IValidationService
{
    IEnumerable<ValidationError> Validate<T>(T entity)
        where T : class;
}

public class FluentValidationService : IValidationService
{
    private readonly IValidatorFactory validatorFactory;

    public FluentValidationService(IValidatorFactory validatorFactory)
    {
        this.validatorFactory = validatorFactory;
    }

    public IEnumerable<ValidationError> Validate<T>(T entity)
        where T : class
    {
        var validator = this.validatorFactory.GetValidator<T>();
        var result = validator.Validate(entity);
        return result.Errors.Select(e => new ValidationError(e.PropertyName, e.ErrorMessage));
    }
}

// Then implement FV's IValidatorFactory:

public class NinjectValidatorFactory : ValidatorFactoryBase
{
    private readonly IKernel kernel;

    public NinjectValidatorFactory(IKernel kernel)
    {
        this.kernel = kernel;
    }

    public override IValidator CreateInstance(Type validatorType)
    {
        return kernel.TryGet(validatorType) as IValidator;
    }
}

// I then wire both of these in a Ninject Module:

public class ValidationModule : NinjectModule
{
    public override void Load()
    {
        this.Bind<IValidationService>().To<FluentValidationService>().InRequestScope(); // Specific to MVC.
        this.Bind<IValidatorFactory>().To<NinjectValidatorFactory>().InRequestScope();
    }
}

// Then I can use it inside a service:

public class FooService
{
    private readonly IValidationService validationService;

    public FooService(IValidationService validationService)
    {
        this.validationService = validationService;
    }

    public bool Add(Foo foo)
    {
        if(this.validationService.Validate(foo).Any())
        {
            // Handle validation errors..
        }

        // do other implementation details here.
    }
}