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C# Entity Framework Basics Extending Our Entity Data Model Defining and Using a One-to-Many Relationship

Posted by Joe Mackey
Joe Mackey
20,418 Points

In Teacher.cs add the following to the Teacher class:

I am confused on how and where to create the constructor Are there any suggestions on a good book to help me understand how to do this correctly?

Course.cs 
using System.Collections.Generic

namespace Treehouse.CodeChallenges
{
    public class Course
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public int TeacherId {get; set;}
        public string Description { get; set; }
        public int Length { get; set; }
        public Teacher Teacher {get; set;}

        public ICollection<Courses> Courses {get; set;}

        // A default constructor that initializes the Courses property to an instance of List<Course> 
        //Looking for some help in explaining how to do this 

    }
}
Teacher.cs 
namespace Treehouse.CodeChallenges
{
    public class Teacher
    {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }
}

3 Answers

Joe Mackey
Joe Mackey
20,418 Points
Joe Mackey
Joe Mackey
20,418 Points 
using System.Collections.Generic;

namespace Treehouse.CodeChallenges
{
    public class Teacher
    {
        public Teachers()
        {
            Courses = new List<Course>();
        }

        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }

        public ICollection<Course> Courses { get; set; }
    }
}

Am I on the right track?

James Churchill
STAFF
James Churchill
Treehouse Teacher
James Churchill
James Churchill
Treehouse Teacher

Joe,

For more information on class constructors, check out this video in our C# Objects course:

https://teamtreehouse.com/library/c-objects/objectoriented-programming/object-initialization

If you haven't already done so, you might go ahead and start at the beginning of the C# Objects course and work your way through it. It has a lot of great information about how to use classes in C#.

Thanks ~James

Jacek Bialek
Jacek Bialek
18,225 Points
Jacek Bialek
Jacek Bialek
18,225 Points

public Teacher()! no public Teachers()