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C# Entity Framework Basics LINQ Queries Writing a List Query

How do you instantiate instance of the Context class? How do you return results of calling ToList on context's DbSet?

I can't see many similarities between the video and the challenge. I'm not able to draw equivalencies (e.g. his "ComicBook" = my GetCourses? .....Context?... Repository.cs? Also I'm not sure if the first part of the video was relevant to the challenge; he uses "context.Database.Log = (message) => Debug.Writeline (message);" Do I need that?

Repository.cs
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;

namespace Treehouse.CodeChallenges
{

    context.Database.Log = (message) => Debug.Writeline (message);


    public static class Repository
    {
        public static List<Course> GetCourses()
        {
            return null; 

            var GetCourses = GetCoursesQuery.ToList();
            Console.WriteLine = ("# of GetCourses: {0}, GetCourses.Count");
        }
    }
}

1 Answer

Steven Parker
Steven Parker
231,198 Points

The use of "context" in the video is very similar to what you will do in the challenge. You'll create it "within a using statement" as mentioned in the instructions. And the "ComicBooks" in the video is a DbSet, similar to the "Courses" in the challenge.

A few additional hints:

  • you can remove the "return null;" line, you will be returning a course list
  • there is nothing defined named "GetCoursesQuery"
  • you don't need to write anything to the console for this challenge