问题
I'm creating an app where users log in via Facebook oAuth and then set up a list of songs. I am getting the following error message:
BandFinderCsharp.Models.IdentityUserLogin: : EntityType 'IdentityUserLogin' has no key defined. Define the key for this EntityType.
BandFinderCsharp.Models.IdentityUserRole: : EntityType 'IdentityUserRole' has no key defined. Define the key for this EntityType.
IdentityUserLogins: EntityType: EntitySet 'IdentityUserLogins' is based on type 'IdentityUserLogin' that has no keys defined.
IdentityUserRoles: EntityType: EntitySet 'IdentityUserRoles' is based on type 'IdentityUserRole' that has no keys defined.
The error message is occurring within my SongsController:
`namespace BandFinder.Controllers.Bread
{
public class SongsController : Controller
{
private SongDBContext db = new SongDBContext();
// GET: Songs
public ActionResult Index()
{
return View(db.Songs.ToList()); <--- This is where the error occurs
}
// GET: Songs/Details/5
public ActionResult Details(long? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Song song = db.Songs.Find(id);
if (song == null)
{
return HttpNotFound();
}
return View(song);
}
// GET: Songs/Create
public ActionResult Create()
{
return View();
}
// POST: Songs/Create
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "Id,UserId,BandId,Title,Artist,Genre,ListId,CreatedOn")] Song song)
{
if (ModelState.IsValid)
{
song.CreatedOn = DateTime.Now;
db.Songs.Add(song);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(song);
}
// GET: Songs/Edit/5
public ActionResult Edit(long? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Song song = db.Songs.Find(id);
if (song == null)
{
return HttpNotFound();
}
return View(song);
}
// POST: Songs/Edit/5
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "Id,UserId,BandId,Title,Artist,Genre,ListId,CreatedOn")] Song song)
{
if (ModelState.IsValid)
{
db.Entry(song).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(song);
}
// GET: Songs/Delete/5
public ActionResult Delete(long? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Song song = db.Songs.Find(id);
if (song == null)
{
return HttpNotFound();
}
return View(song);
}
// POST: Songs/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(long id)
{
Song song = db.Songs.Find(id);
db.Songs.Remove(song);
db.SaveChanges();
return RedirectToAction("Index");
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
db.Dispose();
}
base.Dispose(disposing);
}
}
}`
The thing I don't understand is, this controller has nothing to do with the IdentityUser code..
This is my ApplicationUser Model:
namespace BandFinderCsharp.Models
{
public class ApplicationUser : IdentityUser
{
public ApplicationUser()
{
CreatedOn = DateTime.Now;
this.ProfileImage = new byte[0];
this.facebookImage = new byte[0];
}
public byte[] facebookImage { get; set; }
[MaxLength(32)]
public string FirstName { get; set; }
[MaxLength(32)]
public string LastName { get; set; }
public byte[] ProfileImage { get; set; }
//public virtual ICollection<Instrument> Instruments { get; set; }
//public virtual ICollection<Song> Songs { get; set; }
//public virtual ICollection<Band> Bands { get; set; }
public string Zipcode { get; set; }
[Index]
public float Longitude { get; set; }
[Index]
public float Latitude { get; set; }
[Required]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
public DateTime CreatedOn { get; set; }
//////////////
public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
{
// Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
// Add custom user claims here
return userIdentity;
}
}
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<IdentityUserLogin>().HasKey<string>(l => l.UserId);
modelBuilder.Entity<IdentityRole>().HasKey<string>(r => r.Id);
modelBuilder.Entity<IdentityUserRole>().HasKey(r => new { r.RoleId, r.UserId });
base.OnModelCreating(modelBuilder);
}
public ApplicationDbContext()
: base("DefaultConnection", throwIfV1Schema: false)
{
}
public static ApplicationDbContext Create()
{
return new ApplicationDbContext();
}
}
}
Why am I getting an error referring to Identity models from the songs controller? There should be no correlation between the two at this point.
The IdentityUser class is a built in .NET class which I don't believe I'm able to edit:
namespace Microsoft.AspNet.Identity.EntityFramework
{
//
// Summary:
// Default EntityFramework IUser implementation
public class IdentityUser : IdentityUser<string, IdentityUserLogin, IdentityUserRole, IdentityUserClaim>, IUser, IUser<string>
{
//
// Summary:
// Constructor which creates a new Guid for the Id
public IdentityUser();
//
// Summary:
// Constructor that takes a userName
//
// Parameters:
// userName:
public IdentityUser(string userName);
}
}
IdentityUserLogin
namespace Microsoft.AspNet.Identity.EntityFramework
{
//
// Summary:
// Entity type for a user's login (i.e. facebook, google)
public class IdentityUserLogin : IdentityUserLogin<string>
{
public IdentityUserLogin();
}
}
回答1:
If the ApplicationUser class is the object you're looking to save in the Data Base, then it must contain a field named Id which is by default the primary key of the object to which Entity Framework is linking to.
Your Object should look like:
public class ApplicationUser
{
public int Id { get; set; }
public string Name { get; set; }
}
Or if you want to set a different property as the primary key for the object, you should add the [Key] attribute above that field - and you'll also need to add the System.ComponentModel.DataAnnotations namespace:
public class ApplicationUser
{
public int Id { get; set; }
[Key]
public string Name { get; set; }
}
回答2:
Looking at your entities, I am missing the [Key] attribute that defines the fields for the primary key.
Look at this question, first answer: EntityType 'Category' has no key defined. Define the key for this EntityType
来源：https://stackoverflow.com/questions/44752008/entitytype-no-keys-defined