使用cookies实现浏览历史记录功能

1.创建历史记录的实体类

 public class LastProducts
    {
        private int _productid;
        private int _categoryid;
        private string _imgsrc;
        private string _productname;

        public LastProducts(int id,int typeid,string imgsrc,string restorename)
        {
            _productid = id;
            _categoryid = typeid;
            _imgsrc = imgsrc;
            _productname = restorename;
        }

        public int ProductId
        {
            get { return _productid; }
        }

        public int CategoryId
        {
            get { return _categoryid; }
        }

        public string ImgSrc
        {
            get { return _imgsrc; }
        }

        public string ProductName
        {
            get { return _productname; }
        }
    }

 2.定义存储cookies的方法

public void HistoryRestore(string cookieName,int objectID)
        {
            HttpRequest Request = HttpContext.Current.Request;
            HttpResponse Response = HttpContext.Current.Response;

            if (Request.Cookies[cookieName] != null)
            {
                HttpCookie tempCurBuyerList = Request.Cookies[cookieName];
                string tempstr = tempCurBuyerList.Value;
                if (tempstr.IndexOf(",") > 0)
                {
                    string[] sArray = tempstr.Split(',');
                    bool hasthis = false;

                    foreach (string s in sArray)
                    {
                        if (s == objectID.ToString())
                        {
                            hasthis = true;
                            break;
                        }
                        else
                        {
                            hasthis = false;
                        }
                    }

                    if (!hasthis)   //如果没有ID，则加入
                    {
                        if (sArray.Length > 3) //3为存储浏览记录数的数量，实际数量为7
                        {
                            // 超过数量，去掉最先入队的元素
                            tempstr = tempstr.Substring(0, tempstr.LastIndexOf(","));
                        }
                        // 队列
                        tempstr = objectID.ToString() + "," + tempstr;
                    }
                }
                else
                {
                    //tempstr += "," + objectID.ToString(); 
                    if (tempstr != objectID.ToString())
                    {
                        tempstr = objectID.ToString() + "," + tempstr;
                    }
                }
                tempCurBuyerList.Value = tempstr;
                tempCurBuyerList.Expires = DateTime.Now.AddDays(1);
                Response.Cookies.Add(tempCurBuyerList);
                //或者 Response.Cookies[cookieName].Value = tempstr;
            }
            else
            {
                HttpCookie addToCookies = new HttpCookie(cookieName);
                addToCookies.Value = objectID.ToString();
                addToCookies.Expires = DateTime.Now.AddDays(1);
                Response.Cookies.Add(addToCookies);
            }
        }

3.读取cookies存储数据

public List<LastProducts> GetLastProducts()
        {
            HttpRequest Request = HttpContext.Current.Request;

            List<LastProducts> list = null;

            if (Request.Cookies["restoreid"] != null)
            {
                HttpCookie tempCurBuyerList = Request.Cookies["restoreid"];

                string[] strArr = tempCurBuyerList.Value.Split(',');
                list = new List<LastProducts>();

                foreach (string s in strArr)
                {
                    ShopProduct model = dal.GetProById(int.Parse(s)); //商品的实体类
                    if (model != null)
                    {
                        list.Add(new Model.Shop.LastProducts(model.ProductID, model.CategoryID, model.ImageHref, model.Name));
                    }
                }
            }

            return list;
        }

4.在用户浏览某产品时记录到cookies中：

HistoryRestore("restoreid",productId);

5.数据源的绑定

　　Repeater1.DataSource = GetLastProducts();
      Repeater1.DataBind();