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23,007 Pointslinq query syntax where() and include()
where im i going wrong
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
namespace Treehouse.CodeChallenges
{
public class Course
{
public Course()
{
Students = new List<CourseStudent>();
}
public int Id { get; set; }
public int TeacherId { get; set; }
[Required, StringLength(200)]
public string Title { get; set; }
public string Description { get; set; }
public int Length { get; set; }
public Teacher Teacher { get; set; }
public ICollection<CourseStudent> Students { get; set; }
}
}
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
namespace Treehouse.CodeChallenges
{
public static class Repository
{
public static List<Course> GetCourses()
{
using (var context = new Context())
{
return context.Courses.ToList();
}
}
public static List<Course> GetCoursesByTeacher(string lastName)
{
using (var context = new Context())
{
return context.Courses
.Include(c => c.Teacher)
.Where(Teacher.LastName == lastName)
.ToList();
}
}
}
}
namespace Treehouse.CodeChallenges
{
public class Teacher
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
}
}
1 Answer
Steven Parker
231,198 PointsYou won't need to use .Include()
here since "Teacher" is a property of a "Courses" record.
But you will need to expand the .Where()
argument to make it into a predicate function.