marechai/Marechai/Areas/Admin/Controllers/ScreensController.cs

using System.Linq;
using System.Threading.Tasks;
using Marechai.Database.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.EntityFrameworkCore;

namespace Marechai.Areas.Admin.Controllers
{
    [Area("Admin"), Authorize]
    public class ScreensController : Controller
    {
        readonly MarechaiContext _context;

        public ScreensController(MarechaiContext context) => _context = context;

        // GET: Screens
        public async Task<IActionResult> Index() =>
            View(await _context.Screens.OrderBy(s => s.Diagonal).ThenBy(s => s.EffectiveColors).
                                ThenBy(s => s.NativeResolution.ToString()).ThenBy(s => s.Type).ThenBy(s => s.Size).
                                ToListAsync());

        // GET: Screens/Details/5
        public async Task<IActionResult> Details(int? id)
        {
            if(id == null)
                return NotFound();

            Screen screen = await _context.Screens.FirstOrDefaultAsync(m => m.Id == id);

            if(screen == null)
                return NotFound();

            return View(screen);
        }

        // GET: Screens/Create
        public IActionResult Create()
        {
            ViewData["NativeResolutionId"] = new SelectList(_context.Resolutions.OrderBy(r => r.Chars).
                                                                     ThenBy(r => r.Width).ThenBy(r => r.Height).
                                                                     ThenBy(r => r.Colors).Select(r => new
                                                                     {
                                                                         r.Id, Name = r.ToString()
                                                                     }), "Id", "Name");

            return View();
        }

        // POST: Screens/Create
        // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
        // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
        [HttpPost, ValidateAntiForgeryToken]
        public async Task<IActionResult> Create(
            [Bind("Width,Height,Diagonal,EffectiveColors,Type,NativeResolutionId,Id")]
            Screen screen)
        {
            if(ModelState.IsValid)
            {
                _context.Add(screen);
                await _context.SaveChangesAsync();

                return RedirectToAction(nameof(Index));
            }

            ViewData["NativeResolutionId"] = new SelectList(_context.Resolutions.OrderBy(r => r.Chars).
                                                                     ThenBy(r => r.Width).ThenBy(r => r.Height).
                                                                     ThenBy(r => r.Colors).Select(r => new
                                                                     {
                                                                         r.Id, Name = r.ToString()
                                                                     }), "Id", "Name");

            return View(screen);
        }

        // GET: Screens/Edit/5
        public async Task<IActionResult> Edit(int? id)
        {
            if(id == null)
                return NotFound();

            Screen screen = await _context.Screens.FindAsync(id);

            if(screen == null)
                return NotFound();

            ViewData["NativeResolutionId"] = new SelectList(_context.Resolutions.OrderBy(r => r.Chars).
                                                                     ThenBy(r => r.Width).ThenBy(r => r.Height).
                                                                     ThenBy(r => r.Colors).Select(r => new
                                                                     {
                                                                         r.Id, Name = r.ToString()
                                                                     }), "Id", "Name");

            return View(screen);
        }

        // POST: Screens/Edit/5
        // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
        // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
        [HttpPost, ValidateAntiForgeryToken]
        public async Task<IActionResult> Edit(
            int id, [Bind("Width,Height,Diagonal,EffectiveColors,NativeResolutionId,Type,Id")]
            Screen screen)
        {
            if(id != screen.Id)
                return NotFound();

            if(ModelState.IsValid)
            {
                try
                {
                    _context.Update(screen);
                    await _context.SaveChangesAsync();
                }
                catch(DbUpdateConcurrencyException)
                {
                    if(!ScreenExists(screen.Id))
                        return NotFound();

                    throw;
                }

                return RedirectToAction(nameof(Index));
            }

            ViewData["NativeResolutionId"] = new SelectList(_context.Resolutions.OrderBy(r => r.Chars).
                                                                     ThenBy(r => r.Width).ThenBy(r => r.Height).
                                                                     ThenBy(r => r.Colors).Select(r => new
                                                                     {
                                                                         r.Id, Name = r.ToString()
                                                                     }), "Id", "Name");

            return View(screen);
        }

        // GET: Screens/Delete/5
        public async Task<IActionResult> Delete(int? id)
        {
            if(id == null)
                return NotFound();

            Screen screen = await _context.Screens.FirstOrDefaultAsync(m => m.Id == id);

            if(screen == null)
                return NotFound();

            return View(screen);
        }

        // POST: Screens/Delete/5
        [HttpPost, ActionName("Delete"), ValidateAntiForgeryToken]
        public async Task<IActionResult> DeleteConfirmed(int id)
        {
            Screen screen = await _context.Screens.FindAsync(id);
            _context.Screens.Remove(screen);
            await _context.SaveChangesAsync();

            return RedirectToAction(nameof(Index));
        }

        bool ScreenExists(int id) => _context.Screens.Any(e => e.Id == id);
    }
}