Добавить загрузку файла.

***
Добавил тестовый функционал загрузки файла на сервер.
***

PhoneStore/Controllers/PhonesController.cs

-using System.Collections.Generic;
+using System;
+using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.Extensions.Hosting;
 using PhoneStore.Models;
+using PhoneStore.Services;
+using PhoneStore.ViewModels;
 
 namespace PhoneStore.Controllers
 {
     public class PhonesController : Controller
     {
         private readonly MobileContext _db;
+        private readonly IHostEnvironment _environment;
+        private readonly UploadService _uploadService;
 
-        public PhonesController(MobileContext db)
+        public PhonesController(
+            MobileContext db, 
+            IHostEnvironment environment, UploadService uploadService)
         {
             _db = db;
+            _environment = environment;
+            _uploadService = uploadService;
         }
         /// <summary>
         /// Действие, которое возвращает страницу со списком смартфонов
         /// </summary>
         /// <returns></returns>
         [HttpGet]
-        public IActionResult Index()
+        public IActionResult Index(int? id, string? name)
         {
-            List<Phone> phones = _db.Phones.ToList();
-            
-            return View(phones);
+            var phones = _db.Phones.AsQueryable();
+            if (id.HasValue)
+            {
+                phones = _db.Phones.Where(p => p.Id == id);
+            }
+            if (!string.IsNullOrEmpty(name))
+            {
+                phones = phones.Where(p => string.Equals(p.Name, name, StringComparison.CurrentCultureIgnoreCase));
+            }
+
+            var phoneList = phones.ToList();
+            return View(phones.ToList());
         }
 
         [HttpGet]
@@ -86,5 +105,22 @@ namespace PhoneStore.Controllers
             _db.SaveChanges();
             return RedirectToAction("Index");
         }
+
+        
+        [HttpGet]
+        public IActionResult UploadFile()
+        {
+            return View();
+        }
+        
+        [HttpPost]
+        public async Task<IActionResult> UploadFile(FileViewModel model)
+        {
+            string dirPath = Path.Combine(_environment.ContentRootPath, "wwwroot/Files");
+            string fileName = $"{model.File.FileName}";
+            await _uploadService.UploadAsync(dirPath, fileName, model.File);
+
+            return Ok("Файл успешно загружен");
+        }
     }
 }
\ No newline at end of file

PhoneStore/PhoneStore.csproj

@@ -17,7 +17,6 @@
     </ItemGroup>
 
     <ItemGroup>
-      <Folder Include="Phones" />
       <Folder Include="Migrations" />
     </ItemGroup>
 

PhoneStore/Services/UploadService.cs

+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+
+namespace PhoneStore.Services
+{
+    public class UploadService
+    {
+        public async Task UploadAsync(string dirPath, string fileName, IFormFile file)
+        {
+            await using var stream = new FileStream(Path.Combine(dirPath, fileName), FileMode.Create);
+            await file.CopyToAsync(stream);
+        }
+    }
+}
\ No newline at end of file

PhoneStore/Startup.cs

@@ -20,16 +20,15 @@ namespace PhoneStore
         }
 
         public IConfiguration Configuration { get; }
-        private IServiceCollection _services;
 
         // This method gets called by the runtime. Use this method to add services to the container.
         public void ConfigureServices(IServiceCollection services)
         {
-            _services = services;
             string connection = Configuration.GetConnectionString("DefaultConnection");
             services.AddDbContext<MobileContext>(options => options.UseSqlite(connection));
             services.AddControllersWithViews();
             services.AddScoped<IBasketService, BasketService>();
+            services.AddTransient<UploadService>();
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.

PhoneStore/ViewModels/FileViewModel.cs

+using Microsoft.AspNetCore.Http;
+
+namespace PhoneStore.ViewModels
+{
+    public class FileViewModel
+    {
+        public IFormFile File { get; set; }
+    }
+}
\ No newline at end of file

PhoneStore/Views/Phones/Index.cshtml

@@ -66,9 +66,7 @@ else
             </tr>
         }
     </table>
-    <div class="d-flex justify-content-end my-5">
-        <a class="btn btn-outline-info" asp-action="Create" asp-controller="Phones">Добавить устройство</a>
-    </div>
-
 }
-
+<div class="d-flex justify-content-end my-5">
+    <a class="btn btn-outline-info" asp-action="Create" asp-controller="Phones">Добавить устройство</a>
+</div>

PhoneStore/Views/Phones/UploadFile.cshtml

+@model FileViewModel
+
+@{
+    ViewBag.Title = "Загрузка файла";
+    Layout = "_Layout";
+}
+
+<h2>Загрузите файл на сервер</h2>
+
+<form asp-action="UploadFile" asp-controller="Phones" method="post" enctype="multipart/form-data">
+  <fieldset>
+    <div class="mb-3">
+      <div class="form-check">
+        <input class="form-check-input" type="file" asp-for="File">
+        <label class="form-check-label" asp-for="File">
+          Добавьте файл
+        </label>
+      </div>
+    </div>
+    <button type="submit" class="btn btn-outline-info">Добавить</button>
+  </fieldset>
+</form>