我正在尝试制作网上商店应用程序，在这种情况下，我使用视频游戏作为示例。我为一个名为VideoGame.cs的视频游戏制作了一个模型类，它位于我的ASP.NET MVC项目的Models文件夹中。这个类看起来像：
namespace VideoGameStore.Models
{
public class VideoGame
{
public int Id { get; set; }
public string Title { get; set; }
public DateTime ReleaseDate { get; set; }
public string Genre { get; set; }
public string Description { get; set; }
public decimal Price { get; set; }
}
public class VideoGameDBContext : DbContext
{
public DbSet<VideoGame> VideoGames { get; set; }
}
}
我使用EF Scaffolding制作一个名为VideoGamesController.cs的控制器，位于我项目的Controllers文件夹中。我想过以这样一种方式使用这个控制器，即具有管理员角色的用户可以向该商店添加新的，删除和更新的视频游戏。这就是我的控制器的样子：
namespace VideoGameStore.Controllers
{
public class VideoGamesController : Controller
{
private VideoGameDBContext db = new VideoGameDBContext();
// GET: VideoGames
public ActionResult Index(string sortOrder, string currentFilter, string searchString, int? page)
{
ViewBag.CurrentSort = sortOrder;
ViewBag.TitleSortParm = String.IsNullOrEmpty(sortOrder) ? "title_desc" : "";
ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";
if(searchString != null)
{
page = 1;
}
else
{
searchString = currentFilter;
}
ViewBag.CurrentFilter = searchString;
var videoGames = from v in db.VideoGames
select v;
if(!String.IsNullOrEmpty(searchString))
{
videoGames = videoGames.Where(s => s.Title.Contains(searchString) || s.Description.Contains(searchString));
}
switch(sortOrder)
{
case "title_desc":
videoGames = videoGames.OrderByDescending(s => s.Title);
break;
case "Date":
videoGames = videoGames.OrderBy(s => s.ReleaseDate);
break;
case "date_desc":
videoGames = videoGames.OrderByDescending(s => s.ReleaseDate);
break;
default:
videoGames = videoGames.OrderBy(s => s.Title);
break;
}
int pageSize = 20;
int pageNumber = (page ?? 1);
return View(videoGames.ToPagedList(pageNumber, pageSize));
}
// GET: VideoGames/Details/5
public ActionResult Details(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
VideoGame videoGame = db.VideoGames.Find(id);
if (videoGame == null)
{
return HttpNotFound();
}
return View(videoGame);
}
[Authorize(Roles="Admin")]
// GET: VideoGames/Create
public ActionResult Create()
{
return View();
}
[Authorize(Roles="Admin")]
// POST: VideoGames/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 ActionResult Create([Bind(Include = "Id,Title,ReleaseDate,Genre,Description,Price")] VideoGame videoGame)
{
if (ModelState.IsValid)
{
db.VideoGames.Add(videoGame);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(videoGame);
}
[Authorize(Roles="Admin")]
// GET: VideoGames/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
VideoGame videoGame = db.VideoGames.Find(id);
if (videoGame == null)
{
return HttpNotFound();
}
return View(videoGame);
}
[Authorize(Roles="Admin")]
// POST: VideoGames/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 ActionResult Edit([Bind(Include = "Id,Title,ReleaseDate,Genre,Description,Price")] VideoGame videoGame)
{
if (ModelState.IsValid)
{
db.Entry(videoGame).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(videoGame);
}
[Authorize(Roles="Admin")]
// GET: VideoGames/Delete/5
public ActionResult Delete(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
VideoGame videoGame = db.VideoGames.Find(id);
if (videoGame == null)
{
return HttpNotFound();
}
return View(videoGame);
}
[Authorize(Roles="Admin")]
// POST: VideoGames/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
VideoGame videoGame = db.VideoGames.Find(id);
db.VideoGames.Remove(videoGame);
db.SaveChanges();
return RedirectToAction("Index");
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
db.Dispose();
}
base.Dispose(disposing);
}
}
}
最后，我将拥有一个View，其中项目将向用户显示商店中可用的视频游戏集合（如果用户是管理员，则可以在此视图上管理集合）。名为Index.cshtml的视图位于Views/VideoGames文件夹中，如下所示：
@model PagedList.IPagedList<VideoGameStore.Models.VideoGame>
@using PagedList.Mvc;
<link href="~/Content/PagedList.css" rel="stylesheet" type="text/css" />
@{
ViewBag.Title = "Video Games Store";
}
<h2>Video Games Store</h2>
@if (User.Identity.IsAuthenticated)
{
if (User.IsInRole("Admin"))
{
<p>
@Html.ActionLink("Create New", "Create")
</p>
}
}
@using(Html.BeginForm("Index", "VideoGames", FormMethod.Get))
{
<p>
@Html.TextBox("searchString", ViewBag.CurrentFilter as string)
<input type="submit" value="Search" />
</p>
}
<div class="row">
@foreach (var item in Model) {
<div class="col-md-3">
@Html.DisplayFor(modelItem => item.Title)<br />
@Html.DisplayFor(modelItem => item.Genre)<br />
€@Html.DisplayFor(modelItem => item.Price)<br />
@if (User.Identity.IsAuthenticated)
{
if(User.IsInRole("Admin"))
{
@Html.ActionLink("Edit", "Edit", new { id = item.Id }) <text> | </text>
}
}
@Html.ActionLink("Details", "Details", new { id=item.Id })
@if (User.Identity.IsAuthenticated)
{
if (User.IsInRole("Admin"))
{
<text> | </text> @Html.ActionLink("Delete", "Delete", new { id = item.Id })
}
}
<br />
@Html.ActionLink("Add to cart", "AddToCart", new { controller = "ShoppingCart", id = item.Id })
</div>
}
</div>
<div class="row">
<div class="col-md-12">
Page @(Model.PageCount < Model.PageNumber ? 0 : Model.PageNumber) of @Model.PageCount
@Html.PagedListPager(Model, page => Url.Action("Index", new { page, sortOrder = ViewBag.CurrentSort, currentFilter = ViewBag.CurrentFilter }))
</div>
</div>
目前我想添加一些代码，以便用户点击@Html.ActionLink("Add to cart", "AddToCart", new { controller = "ShoppingCart", id = item.Id })后，用户就可以将所需的商品添加到购物车中。我想添加一个名为ShoppingCartController.cs的新控制器来处理购物车处理，这就是为什么我将它添加到视图中的ActionLink HTML帮助器。这就是ShoppingCartController.cs的样子：
namespace VideoGameStore.Controllers
{
public class ShoppingCartController : Controller
{
// GET: ShoppingCart
public ActionResult Index()
{
return View();
}
public ActionResult AddToCart(int Id)
{
//What code could I add here?
return RedirectToAction("Index");
}
}
}
我一直在阅读使用MVC中的会话来制作购物车不是理想的解决方法。我是否必须将ShoppingCart模型添加到我的项目中并将购物车数据存储在数据库中（如果是这样，我怎么能看起来像这样）？我还读到我不希望用户在HTTP GET请求上存储数据，但我不希望用户必须发布他们的决定，将项目再次添加到不同页面上的购物车中。我怎样才能调整ShoppingCartController.cs？