IDENTITY_INSERT设置为OFF时，EF无法为表“ PATIENT DONOR”中的标识列插入显式值

Question

i am working using EF and I have a table that has an identity property and i tried a lot of solutions but i still get that error. i defined the property in the class as :

[Key]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int PATIENTDONORID { get; set; } 

and i still get that error and i made the identity option is on in OnModelCreating and i also get the same error

 protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
           // throw new UnintentionalCodeFirstException();

            modelBuilder.Entity<PATIENT_DONOR>().Property(x => x.PATIENTDONORID)
              .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

        }

this is the code that makes insertion and save changes in database:

foreach (var item in patient.DONORS)
                {
                    if (item.Checked)
                    {
                        db.PATIENT_DONOR.Add(new PATIENT_DONOR() { PATIENT_ID = patient.PATIENT_ID, DONOR_ID = item.ID});
                    }
                }

               // db.Entry(patient).State = EntityState.Modified;
                db.SaveChanges();

What should i do ?

Answer 1

It is working Correctly now . I realized that After any change in dB I must remove and redrag tables in model. and there is no problems in the code itself