验证IValidatableObject的功能不起作用

I have a "Review" Class:

我有一个“评论”类：

public class Review : IValidatableObject
{
    public int ReviewId { get; set; }

    [DisplayName("Digning Date")]
    [DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)]
    [DataType(DataType.Date)]
    public DateTime Created { get; set; }

    [Range(1, 10)]
    public int Rating { get; set; }

    [Required]
    [DataType(DataType.MultilineText)]
    public string Body { get; set; }
    public int RestaurantId { get; set; }
    public virtual Restaurant Resturant { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        var fields = new[]{ "Created"};

        if(Created > DateTime.Now)
        {
            yield return new ValidationResult("Created date cannot be in the future.", fields);
        }

        if (Created < DateTime.Now.AddYears(-1))
        {
            yield return new ValidationResult("Created date cannot be to far in the past.", fields);
        }
    }
}
public