自己写的一个asp.net cookies 购物车类，实现购物车功能，实现无需注册就可购物

　　using System;

　　using System.Data;

　　using System.Configuration;

　　using System.Web;

　　using System.Web.Security;

　　using System.Web.UI;

　　using System.Web.UI.WebControls;

　　using System.Web.UI.WebControls.WebParts;

　　using System.Web.UI.HtmlControls;

　　//文章来源：http://study.pctoday.net.cn/2_ASP.net.aspx

　　public class CookieShoppingCart

　　{

　　/// <summary>

　　/// 加入购物车

　　/// </summary>

　　/// <param name="ProductID"></param>

　　/// <param name="Quantity"></param>

　　public static void AddToShoppingCart(int ProductID, int Quantity, int Box)

　　{

　　if (HttpContext.Current.Request.Cookies["ShoppingCart"] == null)

　　{

　　HttpCookie oCookie = new HttpCookie("ShoppingCart");

　　//Set Cookie to expire in 3 hours

　　oCookie.Expires = DateTime.Now.AddYears(3);

　　oCookie.Value = ProductID.ToString() + ":" + Quantity.ToString() + ":" + Box.ToString();

　　HttpContext.Current.Response.Cookies.Add(oCookie);

　　}

　　//如果cookie已经存在

　　else

　　{

　　bool bExists = false;

　　HttpCookie oCookie = (HttpCookie)HttpContext.Current.Request.Cookies["ShoppingCart"];

　　oCookie.Expires = DateTime.Now.AddYears(3);

　　string ShoppingCartStr = oCookie.Value.ToString();

　　string[] arrCookie = ShoppingCartStr.Split(new char[] { ',' });

　　//查看cookie中是否有该产品

　　string newCookie = "";

　　for (int i = 0; i < arrCookie.Length; i++)

　　{

　　if (arrCookie[i].Trim().Remove(arrCookie[i].IndexOf(':')) == ProductID.ToString().Trim())

　　{

　　bExists = true;

　　string OldQuantity = arrCookie[i].Trim().Substring(arrCookie[i].Trim().IndexOf(':') + 1);//得到数量

　　OldQuantity = OldQuantity.Remove(OldQuantity.LastIndexOf(":"));

　　OldQuantity = (Convert.ToInt32(OldQuantity) + Quantity).ToString();

　　arrCookie[i] = arrCookie[i].Trim().Remove(arrCookie[i].IndexOf(':')) + ":" + OldQuantity + ":" + Box.ToString();

　 　 //HttpContext.Current.Response.Write(arrCookie[i].Trim().Remove(arrCookie[i].IndexOf(':')) + "已存在！数量：" + OldQuantity + "<br>");

　　//HttpContext.Current.Response.Write(arrCookie[i] + "<br>");

　　}

　　newCookie = newCookie + "," + arrCookie[i];

　　}

　　//如果没有该产品

　　if (!bExists)

　　{

　　oCookie.Value = oCookie.Value + "," + ProductID.ToString() + ":" + Quantity.ToString() + ":" + Box.ToString();

　　}

　　else

　　{

　　oCookie.Value = newCookie.Substring(1);

　　}

　　HttpContext.Current.Response.Cookies.Add(oCookie);

　　HttpContext.Current.Response.Write("ShoppingCart:" + HttpContext.Current.Request.Cookies["ShoppingCart"].Value);

　　}

　　}

　　/// <summary>

　　/// 移除购物车子项

　　/// </summary>

　　/// <param name="ProductID"></param>

　　public static void RemoveShoppingCart(int ProductID)

　　{

　　if (HttpContext.Current.Request.Cookies["ShoppingCart"] != null)

　　{

　　HttpCookie oCookie = (HttpCookie)HttpContext.Current.Request.Cookies["ShoppingCart"];

　　oCookie.Expires = DateTime.Now.AddYears(3);

　　//Check if Cookie already contain same item

　　string ShoppingCartStr = oCookie.Value.ToString();

　　string[] arrCookie = ShoppingCartStr.Split(new char[] { ',' });

　　string[] arrCookie2 = new string[arrCookie.Length - 1];

　　int j = 0;

　　string NewStr = "";

　　for (int i = 0; i < arrCookie.Length; i++)

　　{

　　if (arrCookie[i].Trim().Remove(arrCookie[i].IndexOf(':')) != ProductID.ToString())

　　NewStr = NewStr + "," + arrCookie[i];

　　}

　　if (NewStr == "")

　　HttpContext.Current.Response.Cookies["ShoppingCart"].Value = "";

　　else

　　HttpContext.Current.Response.Cookies["ShoppingCart"].Value = NewStr.Substring(1);

　　}

　　}

　　public static void UpdateShoppingCart(int ProductID, int Quantity, bool box)

　　{

　　int Box = 1;

　　if (!box)

　　Box = 0;

　　if (HttpContext.Current.Request.Cookies["ShoppingCart"] != null)

　　{

　　bool bExists = false;

　　HttpCookie oCookie = (HttpCookie)HttpContext.Current.Request.Cookies["ShoppingCart"];

　　oCookie.Expires = DateTime.Now.AddYears(3);

　　string ShoppingCartStr = oCookie.Value.ToString();

　　string[] arrCookie = ShoppingCartStr.Split(new char[] { ',' });

　　//查看cookie中是否有该产品

　　string newCookie = "";

　　for (int i = 0; i < arrCookie.Length; i++)

　　{

　　if (arrCookie[i].Trim().Remove(arrCookie[i].IndexOf(':')) == ProductID.ToString().Trim())

　　arrCookie[i] = arrCookie[i].Trim().Remove(arrCookie[i].IndexOf(':')) + ":" + Quantity.ToString() + ":" + Box.ToString();

　　newCookie = newCookie + "," + arrCookie[i];

　　}

　　HttpContext.Current.Response.Cookies["ShoppingCart"].Value = newCookie.Substring(1);

　　}

　　}

　　public static DataTable GetShoppingCart()

　　{

　　DataTable dt = new DataTable();

　 　if (HttpContext.Current.Request.Cookies["ShoppingCart"] != null && HttpContext.Current.Request.Cookies["ShoppingCart"].Value.Trim() != "")

　　{

　　HttpCookie oCookie = (HttpCookie)HttpContext.Current.Request.Cookies["ShoppingCart"];

　　oCookie.Expires = DateTime.Now.AddYears(3);

　　string ShoppingCartStr = oCookie.Value.ToString();

　　//HttpContext.Current.Response.Write(ShoppingCartStr);

　　string[] arrCookie = ShoppingCartStr.Split(new char[] { ',' });

　　//查看cookie中是否有该产品

　　string newCookie = "";

　　for (int i = 0; i < arrCookie.Length; i++)

　　{

　　newCookie = newCookie + "," + arrCookie[i].Trim().Remove(arrCookie[i].IndexOf(':'));

　　}

　　newCookie = newCookie.Substring(1);

　　dt = Product.GetProductByProductIds(newCookie, -1);

　　dt.Columns.Add("Quantity");

　　dt.Columns.Add("Box");

　　foreach (DataRow row in dt.Rows)

　　{

　　for (int i = 0; i < arrCookie.Length; i++)

　　{

　　if (arrCookie[i].Trim().Remove(arrCookie[i].IndexOf(':')) == row["ProductId"].ToString())

　　{

　　row["Quantity"] = arrCookie[i].Substring(arrCookie[i].IndexOf(":") + 1);

　　row["Quantity"] = row["Quantity"].ToString().Remove(row["Quantity"].ToString().IndexOf(":"));

　　string Box = arrCookie[i].Substring(arrCookie[i].LastIndexOf(":") + 1);

　　if (Box == "1")

　　row["Box"] = true;

　　else

　　row["Box"] = false;

　　}

　　}

　　}

　　}

　　else

　　{

　　dt = Database.GetDataTable("select top 0 * from View_ProductList");

　　dt.Columns.Add("Quantity");

　　}

　　return dt;

　　}

　　}