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Edit.cshtml.cs
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Edit.cshtml.cs
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#region snippet_All
using ContosoUniversity.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace ContosoUniversity.Pages.Instructors
{
public class EditModel : InstructorCoursesPageModel
{
private readonly ContosoUniversity.Data.SchoolContext _context;
public EditModel(ContosoUniversity.Data.SchoolContext context)
{
_context = context;
}
[BindProperty]
public Instructor Instructor { get; set; }
public async Task<IActionResult> OnGetAsync(int? id)
{
if (id == null)
{
return NotFound();
}
Instructor = await _context.Instructors
.Include(i => i.OfficeAssignment)
.Include(i => i.Courses)
.AsNoTracking()
.FirstOrDefaultAsync(m => m.ID == id);
if (Instructor == null)
{
return NotFound();
}
PopulateAssignedCourseData(_context, Instructor);
return Page();
}
public async Task<IActionResult> OnPostAsync(int? id, string[] selectedCourses)
{
if (id == null)
{
return NotFound();
}
var instructorToUpdate = await _context.Instructors
.Include(i => i.OfficeAssignment)
.Include(i => i.Courses)
.FirstOrDefaultAsync(s => s.ID == id);
if (instructorToUpdate == null)
{
return NotFound();
}
if (await TryUpdateModelAsync<Instructor>(
instructorToUpdate,
"Instructor",
i => i.FirstMidName, i => i.LastName,
i => i.HireDate, i => i.OfficeAssignment))
{
if (String.IsNullOrWhiteSpace(
instructorToUpdate.OfficeAssignment?.Location))
{
instructorToUpdate.OfficeAssignment = null;
}
UpdateInstructorCourses(selectedCourses, instructorToUpdate);
await _context.SaveChangesAsync();
return RedirectToPage("./Index");
}
UpdateInstructorCourses(selectedCourses, instructorToUpdate);
PopulateAssignedCourseData(_context, instructorToUpdate);
return Page();
}
public void UpdateInstructorCourses(string[] selectedCourses,
Instructor instructorToUpdate)
{
#region snippet_IfNull
if (selectedCourses == null)
{
instructorToUpdate.Courses = new List<Course>();
return;
}
#endregion
var selectedCoursesHS = new HashSet<string>(selectedCourses);
var instructorCourses = new HashSet<int>
(instructorToUpdate.Courses.Select(c => c.CourseID));
foreach (var course in _context.Courses)
{
#region snippet_UpdateCourses
if (selectedCoursesHS.Contains(course.CourseID.ToString()))
{
if (!instructorCourses.Contains(course.CourseID))
{
instructorToUpdate.Courses.Add(course);
}
}
#endregion
#region snippet_UpdateCoursesElse
else
{
if (instructorCourses.Contains(course.CourseID))
{
var courseToRemove = instructorToUpdate.Courses.Single(
c => c.CourseID == course.CourseID);
instructorToUpdate.Courses.Remove(courseToRemove);
}
}
#endregion
}
}
}
}
#endregion