从cookie创建和读取列表<>

Question

我正在尝试展示最近浏览过的产品,到目前为止我已经做过了.我有一个Product存储了许多产品的表.我有HomeController一个Details()显示产品细节的Action方法.

我写的AddRecentProduct方法存储了最近浏览过的产品(10)Session

现在我想将这些最近查看的产品列表存储到访问者计算机上至少30天的cookie中,因为会话到期了.就像最近观看的Imdb一样.

另外如果我在数据库中RecentlyViewed使用列创建另一个表,我rv_id, userId, productId将如何在此保存recentViewedList数据？userId列将保存loggedIn用户的id但是如果用户是Guest(未注册)那么解决方案是什么呢？我需要使用GUID吗？

RecentProduct.cs

public class RecentProduct
{
    public int ProductId { get; set; }

    public string ProdutName { get; set; }

    public string ImageUrl { get; set; }

    public DateTime LastVisited { get; set; }
}

调节器

    public void AddRecentProduct(List<RecentProduct> list, int id, string name, int maxItems)
    {
        var item = recentProductList.FirstOrDefault(t => t.ProductId == id);
        if (item == null)
        {
            list.Add(new RecentProduct
            {
                ProductId = id,
                ProdutName = name,
                LastVisited = DateTime.Now,
            });
        }
        while (list.Count > maxItems)
        {
            list.RemoveAt(0);
        }
    }

    public ActionResult Details(int? id)
    {
        if (id == null)
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        Product product = db.Products.Find(id);
        if (product == null)
            return HttpNotFound();

        var list = Session["RecentProductList"] as List<RecentProduct>;
        if (list == null)
        {
            list = new List<RecentProduct>();
            Session["RecentProductList"] = list;
        }
        AddRecentProduct(list, id.Value, product.Name, 10);
        ViewData["RecentProductList"] = list;
        return View(product);
    }

ProductDetails查看页面

<div class="col-sm-9">
            @{
                var recentProductList = ViewData["RecentProductList"] as List<Project.Models.RecentProduct>;
            }

            @foreach (var recentProduct in recentProductList)
            {
                <p>@recentProduct.ProdutName (id: @recentProduct.ProductId)        </p>
            }
        </div>

我正在通过会话获得所需的结果,现在我想用cookie做同样的事情.

这就是我正在尝试创建cookie:

List<RecentProduct> yourList = new List<RecentProduct>();
        RecentProduct rc = new RecentProduct();
        rc.ProdutName = product.Name;
        rc.ProductId = product.ProductId;
        rc.ImageUrl = product.ImagePath;
        rc.LastVisited = DateTime.Now;
        yourList.Add(rc);

        var yourListString = String.Join(",", yourList);
        // Create a cookie
        HttpCookie yourListCookie = new HttpCookie("YourList", yourListString);

        // The cookie will exist for 7 days
        yourListCookie.Expires = DateTime.Now.AddDays(7);

        // Write the Cookie to your Response
        Response.Cookies.Add(yourListCookie);

和在ProductDetails查看页面读取这样的cookie:

 @if (Request.Cookies["YourList"] != null)
    {
        // Your cookie exists - grab your value and create your List
        List<string> yourList = Request.Cookies["YourList"].Value.Split(',').Select(x => Convert.ToString(x)).ToList();

        // Use your list here
        <p>@yourList</p>

    }

我没有得到任何结果.我怎样才能读取cookie和值？

Answer 1

如果您使用cookie，为什么还需要RecentlyViewed 表呢？在 cookie 中存储最近的产品 ID 对登录用户和匿名用户都有效。