Question

我正在使用UI将数据插入数据库。这是我的实体模型和控制器。每当我将数据插入UserDetail表时，它会自动在UserRole表中创建一个新行。不知道为什么会这样发生。现在UserRole在控制器中是硬编码的。

public class UserDetail
{
        [Key]
        public int UserID { get; set; }
        [Required]
        [StringLength(30, MinimumLength = 4)]
        public string UserName { get; set; }
        [Required]
        [StringLength(50, MinimumLength = 4)]
        public string FirstName { get; set; }
        [Required]
        [StringLength(50, MinimumLength = 4)]
        public string LastName { get; set; }
        [Required]
        [EmailAddress]
        [StringLength(150, MinimumLength = 4)]
        public string Email { get; set; }
        [Required]
        [DataType(DataType.Password)]
        [StringLength(30,MinimumLength=4)]
        public string Password { get; set; }
        public UserRole UserRole { get; set; }
}

public class UserRole
{
        [Key]
        public int RoleID { get; set; }
        [Required]
        [StringLength(20,MinimumLength=5)]
        public string RoleName { get; set; }
        public IEnumerable<UserDetail> UserDetail { get; set; }
}

[HttpPost]
public HttpResponseMessage Register(UserDetail usrInfo)
{
    UserContext ctx = new UserContext();

    UserDetail user = new UserDetail
            {
                UserRole = ctx.UserRole.Where(id => id.RoleID == 2).Select(r => r).FirstOrDefault(),
                FirstName = usrInfo.FirstName,
                LastName = usrInfo.LastName,
                UserName = usrInfo.UserName,
                Password = usrInfo.Password,
                Email = usrInfo.Email,
            };
    _unitofwork.userDetail.Add(user);

    if (_unitofwork.Completed() > 0)
        return Request.CreateResponse(HttpStatusCode.OK, "Created");
    else
        return Request.CreateResponse();
}
public class UserContext: DbContext
    {
        public UserContext():base()
        {
            Database.SetInitializer<UserContext>(new CreateDatabaseIfNotExists<UserContext>());
            //Database.SetInitializer<UserContext>(new DropCreateDatabaseIfModelChanges<UserContext>());
        }
        public DbSet<UserDetail> UserDetails { get; set; }
        public DbSet<UserRole> UserRole { get; set; }

    }

Answer 1

在您实例化userdetail对象的语句中，您使用单独定义的上下文来查询用户角色：

UserContext ctx = new UserContext（）;

UserDetail user = new UserDetail
        {
            **UserRole = ctx.UserRole.Where(id => id.RoleID == 2).Select(r => r).FirstOrDefault(),**
            FirstName = usrInfo.FirstName,
            LastName = usrInfo.LastName,
            UserName = usrInfo.UserName,
            Password = usrInfo.Password,
            Email = usrInfo.Email,
        };
_unitofwork.userDetail.Add(user);

if (_unitofwork.Completed() > 0)
    return Request.CreateResponse(HttpStatusCode.OK, "Created");
else
    return Request.CreateResponse()

然后将用户添加到_unitofwork对象下的userdetail集合中，该对象具有自己的上下文。为了完成这项工作，您检索的userrole对象必须位于添加userdetail对象的相同上下文中。

所以你可能想要这样的东西：

 UserDetail user = new UserDetail
            {
                UserRole = _unitofwork.UserRole.Where(id => id.RoleID == 2).Select(r => r).FirstOrDefault(),
                FirstName = usrInfo.FirstName,
                LastName = usrInfo.LastName,
                UserName = usrInfo.UserName,
                Password = usrInfo.Password,
                Email = usrInfo.Email,
            };
    _unitofwork.userDetail.Add(user);

实体框架自动在父表中插入新行

1 个答案: