編程實現cookies瀏覽歷史記錄功能

 1.創建歷史記錄的實體類
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.定義存儲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) //如果沒有ID，則加入
{
if (sArray.Length > 3) //3為存儲瀏覽記錄數的數量，實際數量為7
{
// 超過數量，去掉最先入隊的元素
tempstr = tempstr.Substring(0, tempstr.LastIndexOf(","));
}
// 隊列
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.讀取cookies存儲數據
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)); //商品的實體類
if (model != null)
{
list.Add(new Model.Shop.LastProducts(model.ProductID, model.CategoryID, model.ImageHref, model.Name));
}
}
}

return list;
}


4.在用戶瀏覽某產品時記錄到cookies中：

HistoryRestore("restoreid",productId);


5.數據源的綁定
　　Repeater1.DataSource = GetLastProducts();
Repeater1.DataBind();