非标准命名非唯一外键

Question

Due to the way that my database is set up (which I don't have control over), I've got a foreign key situation that I can't figure out in Entity Framework. I'm using Fluent API to configure my relationships. My classes are

public class Parent
{
   // Unique primary key
   public int PrimaryKey { get; set; }

   // These two fields together compose the foreign key to join to Child
   public string ParentForeignKey1 { get; set; }
   public string ParentForeignKey2 { get; set; }

   public List<Child> Children { get; set; }
}

public class Child
{
   // Unique primary key
   public int PrimaryKey { get; set; }

   // These two fields together compose the (non-unique) foreign key to join to Parent
   public string ChildForeignKey1 { get; set; }
   public string ChildForeignKey2 { get; set; }

   // The parent/child relationship is implicit, even though the tables
   // themselves indicate a many-to-many relationship
   public List<Parent> Parents { get; set; }
}

The Entity Framework relationship should be such that the two tables join on the ParentForeignKey and ChildForeignKey fields like

SELECT * 
FROM Parent 
JOIN Child 
 ON  Child.ChildForeignKey1 = Parent.ParentForeignKey1
 AND Child.ChildForeignKey2 = Parent.ParentForeignKey2

How do I set up the Fluent API foreign key mapping so that Entity Framework generates those joins when I query the DbSet s?

Answer 1

I think this makes more sense

public class Parent
{
   // The parent/child relationship is implicit, even though the tables
   // themselves indicate a many-to-many relationship
   public static List<Parent> Parents { get; set; }


   // Unique primary key
   public int PrimaryKey { get; set; }

   // These two fields together compose the foreign key to join to Child
   public string ParentForeignKey1 { get; set; }
   public string ParentForeignKey2 { get; set; }

   public List<Child> Children { get; set; }
}

public class Child
{
   // Unique primary key
   public int PrimaryKey { get; set; }

   // These two fields together compose the (non-unique) foreign key to join to Parent
   public string ChildForeignKey1 { get; set; }
   public string ChildForeignKey2 { get; set; }

}