Hello everybody,

today I want to make short post on how to confiugre one to many relationship in Entity Framework 6.

Imagine following: One group can have multiple students. So one to many relationship. For this purpose you can use following convention configuration agreement:

public class Student
{
    public int StudentId { get; set; }
    public string StudentName { get; set; }
}
 
public class Group
{
    public int GroupId { get; set; }
    public string GroupName { get; set; }
    public string Department { get; set; }
 
    public List<Student> Students { get; set; }
}

In presented example class group includes navigation property Students. 

Another convention is like this:

public class Student
{
    public int StudentId { get; set; }
    public string StudentName { get; set; }
 
    public Group CurrentGroup { get; set; }
}
 
public class Group
{
    public int GroupId { get; set; }
    public string GroupName { get; set; }
    public string Department { get; set; }
 
    public List<Student> Students { get; set; }
}

as you can see, difference is that Student instance by itself knows to which Group it belongs.