EntityType 'MyProfile' has no key defined. Define the key for this EntityType

Question

I am not sure why I am getting this error message. I have a primary key defined in my sql database for it. Here is my code:

[HttpPost]
    public ActionResult Register(RegisterModel model)
    {
        if (ModelState.IsValid)
        {
            // Attempt to register the user
            MembershipCreateStatus createStatus = MembershipService.CreateUser(model.UserName, model.Password, model.Email);

            if (createStatus == MembershipCreateStatus.Success)
            {

                FormsService.SignIn(model.UserName, false /* createPersistentCookie */);
                MembershipUser myObject = Membership.GetUser();
                Guid UserID = (Guid)myObject.ProviderUserKey;
                MyProfile profile = new MyProfile();
                profile.Address = model.Address;
                profile.City = model.City;
                profile.Zip = model.Zip;
                profile.State = model.State;
                profile.UserId = UserID;
                db.Profiles.Add(profile);
                return RedirectToAction("Index", "Home");
            }
            else
            {
                ModelState.AddModelError("", AccountValidation.ErrorCodeToString(createStatus));
            }
        }

        // If we got this far, something failed, redisplay form
        ViewBag.PasswordLength = MembershipService.MinPasswordLength;
        return View(model);
    }

And this is my MyProfile Class:

   namespace MatchGaming.Models
{
    [Bind(Exclude = "ProfileId")]
    public class MyProfile
    {
        [ScaffoldColumn(false)]
        public int ProfileId { get; set; }

        public Guid UserId { get; set; }

        [DisplayName("Address")]
        public string Address { get; set; }

        [DisplayName("City")]
        public string City { get; set; }

        [DisplayName("Zip")]
        public string Zip { get; set; }

        [DisplayName("State")]
        public string State { get; set; }


    }
}

I am not sure why I am getting this error: EntityType 'MyProfile' has no key defined. Define the key for this EntityType. EntityType 'MyProfile' has no key defined. Define the key for this EntityType. when it tries to add to the database db.Profiles.Add(profile); .

Answer 1

Which field is your key? Whichever it is - ProfileId or UserId - either change the name to MyProfileId or Id or else put a [Key] attribute on it.

Answer 2

I ran into this issue also and wanted to add that in Entity Framework version 6 this error occurs because the DbgGeography type has been moved from the assembly system.data.entity and into the entityframework.dll

to resolve this in EF 6+ remove the reference to the entity dll and change the using statement to using System.Data.Entity.Spatial

see this http://entityframework.codeplex.com/workitem/1535