sql server - How do i assign 2 values from different tables into 1 variable name as foreign key using Entity Framework-Code First -


i'm confused foreign key concept. i'm trying arrange key relationships in each database class according code first concept in entity framework.

i have 3 tables: a, b , c.

table has aid primary key(pk), table b has bid pk, table c has cid primary key. relationship between table is:

  • a-b : many-to-one,
  • a-c : one-to-one,
  • b-c : one-to-many

table has variable refid can hold both bid or cid values. 

<foreignkey("bid")> public property refid b  <foreignkey("cid")> public property refid c

refid highlighted red saying

the properties cannot overload each other because differ return types.

what doing wrong?

edited

public class      public property aid string  // primary key      public property refid string      <foreignkey("refid")>     public property b b      <foreignkey("refid")>     public property c c  end class   public class b      public property bid string    // primary key      // b navigation property     public property acol icollection(of a)  end class   public class c      public property cid string  // primary key      // c navigation property     public property acol icollection(of a)  end class


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