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InstructorCoursesPageModel.cshtml.cs
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InstructorCoursesPageModel.cshtml.cs
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using ContosoUniversity.Data;
using ContosoUniversity.Models;
using ContosoUniversity.Models.SchoolViewModels;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System.Collections.Generic;
using System.Linq;
namespace ContosoUniversity.Pages.Instructors
{
public class InstructorCoursesPageModel : PageModel
{
public List<AssignedCourseData> AssignedCourseDataList;
public void PopulateAssignedCourseData(SchoolContext context,
Instructor instructor)
{
var allCourses = context.Courses;
var instructorCourses = new HashSet<int>(
instructor.CourseAssignments.Select(c => c.CourseID));
AssignedCourseDataList = new List<AssignedCourseData>();
foreach (var course in allCourses)
{
AssignedCourseDataList.Add(new AssignedCourseData
{
CourseID = course.CourseID,
Title = course.Title,
Assigned = instructorCourses.Contains(course.CourseID)
});
}
}
public void UpdateInstructorCourses(SchoolContext context,
string[] selectedCourses, Instructor instructorToUpdate)
{
if (selectedCourses == null)
{
instructorToUpdate.CourseAssignments = new List<CourseAssignment>();
return;
}
var selectedCoursesHS = new HashSet<string>(selectedCourses);
var instructorCourses = new HashSet<int>
(instructorToUpdate.CourseAssignments.Select(c => c.Course.CourseID));
foreach (var course in context.Courses)
{
if (selectedCoursesHS.Contains(course.CourseID.ToString()))
{
if (!instructorCourses.Contains(course.CourseID))
{
instructorToUpdate.CourseAssignments.Add(
new CourseAssignment
{
InstructorID = instructorToUpdate.ID,
CourseID = course.CourseID
});
}
}
else
{
if (instructorCourses.Contains(course.CourseID))
{
CourseAssignment courseToRemove
= instructorToUpdate
.CourseAssignments
.SingleOrDefault(i => i.CourseID == course.CourseID);
context.Remove(courseToRemove);
}
}
}
}
}
}