实体类字段使用属性类来实现验证功能

在System.ComponentModel.DataAnnotations命名空间中，已经有了一些基本的属性类来实现验证功能，只要把这些属性加到Model的字段上就可以了。

namespace HRApp.Web
{
    using System.ComponentModel.DataAnnotations;
    using HRApp.Web.Resources;

    public sealed partial class RegistrationData
    {
        [Key]
        [Required(ErrorMessageResourceName = "ValidationErrorRequiredField", ErrorMessageResourceType = typeof(ErrorResources))]
        [Display(Order = 0, Name = "UserNameLabel", ResourceType = typeof(RegistrationDataResources))]
        [RegularExpression("^[a-zA-Z0-9_]*$", ErrorMessageResourceName = "ValidationErrorInvalidUserName", ErrorMessageResourceType = typeof(ErrorResources))]
        public string UserName { get; set; }

        [Key]
        [Required(ErrorMessageResourceName = "ValidationErrorRequiredField", ErrorMessageResourceType = typeof(ErrorResources))]
        [Display(Order = 2, Name = "EmailLabel", ResourceType = typeof(RegistrationDataResources))]
        [RegularExpression(@"^([w-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([w-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$",
                           ErrorMessageResourceName = "ValidationErrorInvalidEmail", ErrorMessageResourceType = typeof(ErrorResources))]
        public string Email { get; set; }

        [Required(ErrorMessageResourceName = "ValidationErrorRequiredField", ErrorMessageResourceType = typeof(ErrorResources))]
        [Display(Order = 3, Name = "PasswordLabel", Description = "PasswordDescription", ResourceType = typeof(RegistrationDataResources))]
        [RegularExpression("^.*[^a-zA-Z0-9].*$", ErrorMessageResourceName = "ValidationErrorBadPasswordStrength", ErrorMessageResourceType = typeof(ErrorResources))]
        [StringLength(50, MinimumLength = 7, ErrorMessageResourceName = "ValidationErrorBadPasswordLength", ErrorMessageResourceType = typeof(ErrorResources))]
        public string Password { get; set; }

        [Display(Order = 1, Name = "FriendlyNameLabel", Description = "FriendlyNameDescription", ResourceType = typeof(RegistrationDataResources))]
        public string FriendlyName { get; set; }

        [Required(ErrorMessageResourceName = "ValidationErrorRequiredField", ErrorMessageResourceType = typeof(ErrorResources))]
        [Display(Order = 5, Name = "SecurityQuestionLabel", ResourceType = typeof(RegistrationDataResources))]
        public string Question { get; set; }

        [Required(ErrorMessageResourceName = "ValidationErrorRequiredField", ErrorMessageResourceType = typeof(ErrorResources))]
        [Display(Order = 6, Name = "SecurityAnswerLabel", ResourceType = typeof(RegistrationDataResources))]
        public string Answer { get; set; }
    }
}

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