1、这是EF生成的类：

namespace PMS.DataProvider.EntityFramework{    using System;    using System.Collections.Generic;        public partial class M_Managers    {        public string UserName { get; set; }        public string NickName { get; set; }        public string PassWord { get; set; }        public string HeadImg { get; set; }        public int Age { get; set; }        public bool IsMale { get; set; }        public string Email { get; set; }        public string Mobile { get; set; }        public string Address { get; set; }        public string Signature { get; set; }        public string Roles { get; set; }        public string Description { get; set; }        public System.DateTime CreateDate { get; set; }        public string CreateUser { get; set; }        public System.DateTime LastLoginDate { get; set; }        public int LoginTimes { get; set; }    }}

2、新建一个部分（partial）类：

using System;using System.Collections.Generic;using System.ComponentModel.DataAnnotations;using System.Linq;using System.Text;using System.Threading.Tasks;namespace PMS.DataProvider.EntityFramework{    [MetadataType(typeof(M_ManagersMetadata))]    public partial class M_Managers    {          //这里还可以添加“新增属性” public string AdminTypeStr         {
                 get             { if (AdminType == "SuperAdmin") { return "超级管理员"; } else { return "普通管理员"; } }             set { value = AdminType; }         }     }    public class M_ManagersMetadata    {        [Display(Name = "用户名")]        [Required(ErrorMessage = "*")]        [StringLength(50, ErrorMessage = "字符长度应在6-50之间", MinimumLength = 6)]        public string UserName { get; set; }        [Display(Name = "显示名")]        [Required(ErrorMessage = "*")]        [StringLength(50, ErrorMessage = "字符长度应在6-50之间", MinimumLength = 6)]        public string NickName { get; set; }        [Display(Name = "密码")]        [Required(ErrorMessage = "*")]        [DataType(DataType.Password)]        [StringLength(50, ErrorMessage = "字符长度应在6-50之间", MinimumLength = 6)]        public string PassWord { get; set; }        [Display(Name = "头像")]        [DataType(DataType.ImageUrl)]        public string HeadImg { get; set; }        [Display(Name = "年龄")]        [Range(10, 120, ErrorMessage = "年龄应在10-120之间")]        public int Age { get; set; }        [Display(Name = "性别")]        public bool IsMale { get; set; }        [Display(Name = "邮箱")]        [Required(ErrorMessage = "*")]        [DataType(DataType.EmailAddress)]        [EmailAddress(ErrorMessage = "邮箱格式不正确")]        [StringLength(50, ErrorMessage = "字符长度应在6-50之间", MinimumLength = 6)]        public string Email { get; set; }        [Display(Name = "手机")]        [Required(ErrorMessage = "*")]        public string Mobile { get; set; }        [Display(Name = "地址")]        public string Address { get; set; }        [Display(Name = "签名")]        public string Signature { get; set; }        [Display(Name = "角色")]        public string Roles { get; set; }        [Display(Name = "描述")]        [DataType(DataType.MultilineText)]        public string Description { get; set; }        [Display(Name = "创建日期")]        [DataType(DataType.DateTime, ErrorMessage = "日期格式不正确")]        public System.DateTime CreateDate { get; set; }        [Display(Name = "创建人")]        public string CreateUser { get; set; }        [Display(Name = "最后登录日期")]        [DataType(DataType.Date, ErrorMessage = "日期格式不正确")]        public System.DateTime LastLoginDate { get; set; }        [Display(Name = "登录次数")]        public int LoginTimes { get; set; }    }}

注意：

 

[MetadataType(typeof(M_ManagersMetadata))]//给新建的部分类指定要关联的元数据类    public partial class M_Managers//这是新建的部分类，注意要与EF生成的类一样，包括类名称和命名空间    {    }    public class M_ManagersMetadata//新建一个元数据类    {         //这里写Model验证        [Display(Name = "用户名")]        [Required(ErrorMessage = "*")]        [StringLength(50, ErrorMessage = "字符长度应在6-50之间", MinimumLength = 6)]        public string UserName { get; set; } 　 }