visual studio - Multiple Inheritance (maybe Abstract class?) C# Entity Framework -

the last weeks have been working on development of database based on entity framework 6 (code-first) on c# using visual studio 2015.

i'm working on options inheritance offers work with. @ point , following standards of database should implement multiple inheritance primary key. means? means should implement class inherits class , have own pk identify him different parent class. @ point implement tpc, making parent class abstract , not defining pk on parent. sample of code @ point (this works , have tested it)

    public abstract class person     {          public string name { get; set; }         public string lastname { get; set; }      }      [table("students")]     public class student : person     {          [key]public int id_student { get; set; }         public string code_s { get; set; }         public virtual icollection<course> courses { get; set; }      } 

then standard should follow build database requires me implement inheritance taking student parent , creating class inherits student. first , stupid idea had make simple write

childofchild : student 

but didn't work.

then come mind possibility of make student class abstract, when declared student class abstract didn't let me instantiate , seed table. i'm not sure if there other way this, using abstract class or other method useful develop this. if didn't understand problem i'm trying solve sample of code have , works.

    public abstract class person     {          public string name { get; set; }         public string lastname { get; set; }      }      [table("students")]     public class student : person     {          [key]public int id_student { get; set; }         public string code_s { get; set; }         public virtual icollection<course> courses { get; set; }      }      [table("exchangestudent")]     public class exchangestudent : student     {          [key]public int id_exchange { get; set; }         public string homeuniversity {get; set;}      } 

from understanding want 2 tables both own primary keys , foreign key define 1 one relationship. in c# code want these tables have inheritance relationship.

the way can see doing entity framework split requirements. firstly create database models represent table structure want.

namespace dao {     public abstract class person     {         public string name { get; set; }     }      public class student     {         public int studentid { get; set; }         public string nickname { get; set; }     }      //use navigation property rather inheritance define relationship     public class exchangestudent      {         public int exchangestudentid { get; set; }         public string homeuniversity { get; set; }         public virtual student student { get; set; }     } } 

this gave me following code:

 public override void up()         {             createtable(                 "dbo.exchangestudent",                 c => new                     {                         exchangestudentid = c.int(nullable: false, identity: true),                         homeuniversity = c.string(),                         student_studentid = c.int(),                     })                 .primarykey(t => t.exchangestudentid)                 .foreignkey("dbo.student", t => t.student_studentid)                 .index(t => t.student_studentid);              createtable(                 "dbo.student",                 c => new                     {                         studentid = c.int(nullable: false, identity: true),                         nickname = c.string(),                         name = c.string(),                     })                 .primarykey(t => t.studentid);          } 

now if need have inheritance relationship between student , exchangestudent can create new objects define in different namespace

namespace businessobject {     public abstract class person     {         public string name { get; set; }     }      public class student     {         public int studentid { get; set; }         public string nickname { get; set; }     }      //exchangestudent derives student     public class exchangestudent : student     {         public int exchangestudentid { get; set; }         public string homeuniversity { get; set; }     } } 

then need create class maps 2 objects. there 3rd party libraries can well.

wiki