一对一关系modelBuilder

Question

我试图建立一对一的关系。请问我在哪里写这些专栏？

modelBuilder.Entity<OfficeAssignment>() 
    .HasRequired(t => t.Instructor) 
    .WithOptional(t => t.OfficeAssignment);

非常感谢！

Answer 1

您将在上下文类中的OnModelCreating方法

中编写这些代码行

    public class MyContext : DbContext
    {

        public DbSet<OfficeAssignment> OfficeAssignments { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<OfficeAssignment>() 
                        .HasRequired(t => t.Instructor) 
                        .WithOptional(t => t.OfficeAssignment);

            base.OnModelCreating(modelBuilder);
        }
    }

Answer 2

您可以在上下文类中编写它，例如：

   public class AssignmentContext : DbContext
   {
      public IDbSet<OfficeAssignment> OfficeAssignments { get; set; }
      protected override void OnModelCreating(DbModelBuilder modelBuilder)
      {
          modelBuilder.Entity<OfficeAssignment>() 
             .HasRequired(t => t.Instructor) 
             .WithOptional(t => t.OfficeAssignment);
          base.OnModelCreating(modelBuilder);
      }
   }