实体框架6.1：多个添加的实体可能具有相同的主键

Question

我遇到了Entity Framework的问题，这就是错误：Unable to determine the principal end of the 'Force.Data.Models.Employee_Office' relationship. Multiple added entities may have the same primary key.我无法弄清问题是什么，我一直在盯着它现在三个小时。这是代码，有人可以指出我正确的方向，因为我似乎无法：

Employee.cs

public partial class Employee : Person, IUser<int> {
    public int Id { get; set; }

    #region Relationship Properties
    public byte CompanyId { get; set; }
    public short OfficeId { get; set; }
    public int? ManagerId { get; set; }

    public virtual ICollection<Address> Addresses { get; private set; }
    public virtual Company Company { get; set; }
    public virtual ICollection<Device> Devices { get; private set; }
    public virtual ICollection<Email> Emails { get; private set; }
    public virtual ICollection<Employee> Employees { get; private set; }
    public virtual Employee Manager { get; set; }
    public virtual Office Office { get; set; }
    public virtual ICollection<Phone> Phones { get; private set; }
    public virtual ICollection<Role> Roles { get; private set; }
    #endregion
}

Office.cs

public partial class Office {
    public short Id { get; set; }

    #region Relationship Properties
    public int AddressId { get; set; }
    public short RegionId { get; set; }

    public virtual Address Address { get; set; }
    public virtual ICollection<Employee> Employees { get; private set; }
    public virtual ICollection<Job> Jobs { get; private set; }
    public virtual ICollection<Lead> Leads { get; private set; }
    public virtual ICollection<Phone> Phones { get; private set; }
    public virtual Region Region { get; set; }
    #endregion
}

EmployeeConfiguration.cs

internal sealed class EmployeeConfiguration : EntityTypeConfiguration<Employee> {
    public EmployeeConfiguration() {
        this.ToTable("Employees");

        this.HasKey(
            k =>
                k.Id);

        #region Properties
        #endregion

        #region Relationships
        /// Employee has a 1:* relationship with Offices.
        this.HasRequired(
            t =>
                t.Office).WithMany(
            t =>
                t.Employees).HasForeignKey(
            k =>
                k.OfficeId);
        #endregion
    }
}

OfficeConfiguration.cs

internal sealed class OfficeConfiguration : EntityTypeConfiguration<Office> {
    public OfficeConfiguration() {
        this.ToTable("Offices");

        this.HasKey(
            k =>
                k.Id);

        #region Properties
        this.Property(
            p =>
                p.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        #endregion

        #region Relationships
        #endregion
    }
}

这里还是生成的数据库的屏幕截图，对我来说很好看。我不认为这是对我大吼大叫的数据库，而是EF对某些事情感到困惑......

Answer 1

所以，我是个白痴，这个问题一直在看着我......事实证明，Seed方法失败了。在其中我添加了40个Employee个对象，但其中一个没有分配Office，这就是它失败的原因。呃，我需要小睡......