EntityFramework Same Table Many to Many Relationship

Question

I have a table called Products which obviously contains products. However, I need to create related products. So what I\'ve done is create a junction table called product_re

Answer 1

Lets take your Example:

Related table

  Related_id      PK
  Related_name
  Date

Product Table

  Product_id      PK
  Related_id      FK
  Product_Name
  Date

How to Represent it in EF

Related Model Class named as RelatedModel

  [Key]
  public int Related_id { get; set; }

  public string Related_name {get;set}

  public Datetime Date{get;set;}

Product Model Class named as ProductModel

   [Key]
  public int Product_id { get; set; }

  public string Product_name {get;set}

  public string Related_id {get;set}

  public Datetime Date{get;set;}

  [ForeignKey("Related_id ")]      //We  can also specify here Foreign key
  public virtual RelatedModel Related { get; set; } 

In this way we can Create Relations between Two table

Now In Case of Many to Many Relation I would like to take another Example here

Suppose I have a Model Class Enrollment.cs

public class Enrollment
{
    public int EnrollmentID { get; set; }
    public int CourseID { get; set; }
    public int StudentID { get; set; }
    public decimal? Grade { get; set; }
    public virtual Course Course { get; set; }
    public virtual Student Student { get; set; }
}

Here CourseID and StudentId are the two foreign Keys

Now I Have another Class Course.cs where we will create Many to Many Relation.

public class Course
{
    public int CourseID { get; set; }
    public string Title { get; set; }
    public int Credits { get; set; }
    public virtual ICollection Enrollments { get; set; }
}

Hope This will help!!!