everything/EveryThing/Pages/Projects/CreatePart.cshtml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.Rendering;
using EveryThing.Data;
using EveryThing.Models;
using EveryThing.Models.Project;
using Microsoft.AspNetCore.Authorization;

namespace EveryThing.Pages.Projects
{
    [Authorize(Roles = "Administrator,ProjecThingUser")]
    public class CreatePartModel : PageModel
    {
        private readonly ApplicationDbContext _context;
        private readonly UserManager<IdentityApplicationUser> _userManager;
        private readonly SignInManager<IdentityApplicationUser> _loginManager;
        private readonly RoleManager<IdentityApplicationRole> _roleManager;

        public CreatePartModel(ApplicationDbContext context, UserManager<IdentityApplicationUser> userManager, SignInManager<IdentityApplicationUser> loginManager, RoleManager<IdentityApplicationRole> roleManager)
        {
            _context = context;
            _userManager = userManager;
            _loginManager = loginManager;
            _roleManager = roleManager;
        }

        public IActionResult OnGet(int idProject)
        {
            ViewData["IdProject"] = idProject;

            ProjectPart = new ProjectPart
            {
                IdProjectFk = idProject
            };

            return Page();
        }

        [BindProperty]
        public Models.Project.ProjectPart ProjectPart { get; set; }

        public async Task<IActionResult> OnPostAsync()
        {
            if (!ModelState.IsValid)
            {
                return Page();
            }

            var user = _userManager.GetUserAsync(User).Result;

            ProjectPart.Status = ProjectPartStatus.Opened;

            var items = _context.ProjectParts
                .Where(x => x.IdProjectFk == ProjectPart.IdProjectFk).ToList();

            ProjectPart.ProjectPartNumber = items.Count <= 0 ? 1 : items.Max(x => x.ProjectPartNumber) + 1;

            _context.ProjectParts.Add(ProjectPart);
            await _context.SaveChangesAsync();

            return RedirectToPage("./Edit", new { id = ProjectPart.IdProjectFk });
        }
    }
}