How to implement Entity Framework polymorphic relationships?

Question

ASP.NET

Hello!
Interested in the question of how to implement polymorphism, in the following configuration?
We have the following models:

public class Staff
    {
        [HiddenInput(DisplayValue = false)]             
        public int Id { get; set; }
        public string Name {get;set;}
        public virtual ICollection<StaffReports_> StaffReports { get; set; }
    }

public class StaffReports_
    {
        public int ReportId { get; set; }
        public Report Report { get; set; }
        public int? StaffId { get; set; }
        public Staff Staff { get; set; }
    }

public class Report
    {
        public int Id { get; set; }
        public DateTime DateNow { get; set; }               
        public string Autor { get; set; }                   
         public ICollection<StaffReport_> Interns { get; set; }
    }

Now there is a need to add another table for a many-to-many relationship, StaffReport1_ for example!

public class StaffReports1_
    {
        public int ReportId { get; set; }
        public Report Report { get; set; }
        public int? StaffId { get; set; }
        public Staff Staff { get; set; }
    }

Answer 1

Classes StaffReports_ and StaffReports1_ are not needed, we simply write:
in class Staff
in classReport
Next we configure (see void OnModelCreating(DbModelBuilder modelBuilder)