使用cookie制作购物车
思路：使用cookie存储产品ID和客户的订购量，其它的东西根据id值去库里面取
先看看cookie类，专门用于插入产品、更新订购量、删除产品
把产品添加到购物车的代码：
public class CCookieShoppingCart
{
public CCookieShoppingCart()
{
//
// TODO: Add constructor logic here
//
}
public static void AddToShoppingCart(int ProductID, int amount)
{
if (HttpContext.Current.Request.Cookies["ShoppingCart"] == null)
{
HttpCookie oCookie = new HttpCookie("ShoppingCart");
//Set Cookie to expire in 3 hours
oCookie.Expires = DateTime.Now.AddHours(3);
oCookie.Value = ProductID.ToString() + "*" + amount.ToString();
HttpContext.Current.Response.Cookies.Add(oCookie);
}
//如果cookie已经存在
else
{
bool bExists = false;
char[] sep = { ',' };
HttpCookie oCookie = (HttpCookie)HttpContext.Current.Request.Cookies["ShoppingCart"];
//Set Cookie to expire in 3 hours
oCookie.Expires = DateTime.Now.AddHours(3);
//Check if Cookie already contain same item
string sProdID = oCookie.Value.ToString();
string[] arrCookie = sProdID.Split(sep);
//查看cookie中是否有该产品
string newCookie="";
for (int i = 0; i < arrCookie.Length; i++)
{
//
if (arrCookie[i].Length != 0)
{
if (arrCookie[i].Trim().Remove(arrCookie[i].IndexOf('*')) == ProductID.ToString().Trim())
{
bExists = true;
//得到数量
string amountStr = arrCookie[i].Trim().Substring(arrCookie[i].Trim().IndexOf('*') + 1);
amountStr = (Convert.ToInt64(amountStr) + amount).ToString();
arrCookie[i] = arrCookie[i].Trim().Remove(arrCookie[i].IndexOf('*')) + "*" + amountStr;
newCookie = newCookie+","+arrCookie[i];
}
}
}
//如果没有该产品
if (!bExists)
{
if (oCookie.Value.Length == 0)
{
oCookie.Value = ProductID.ToString() + "*" + amount.ToString();
}
else
{
oCookie.Value = oCookie.Value + "," + ProductID.ToString() + "*" + amount.ToString();
}
}
else
{
oCookie.Value = newCookie.Substring(1);
}
//Add back into the HttpContext.Current.Response Objects.
HttpContext.Current.Response.Cookies.Add(oCookie);
}
}
public static void RemoveShoppingCart(int ProductID)
{
if (HttpContext.Current.Request.Cookies["ShoppingCart"] == null)
{
//Do nothing
}
else
{
HttpCookie oCookie = (HttpCookie)HttpContext.Current.Request.Cookies["ShoppingCart"];
//Set Cookie to expire in 3 hours
char[] sep = { ',' };
oCookie.Expires = DateTime.Now.AddHours(3);
//Check if Cookie already contain same item
string sProdID = oCookie.Value.ToString();
string[] arrCookie = sProdID.Split(sep);
string[] arrCookie2 = new string[arrCookie.Length - 1];
int j = 0;
for (int i = 0; i < arrCookie.Length; i++)
{
if (arrCookie[i].Trim().Remove(arrCookie[i].IndexOf('*')) != ProductID.ToString())
{
arrCookie2[j] = arrCookie[i];
j++;
}
}
string sCookieID = "";
for (int i = 0; i < arrCookie2.Length; i++)
{
sCookieID = sCookieID + arrCookie2[i] + ",";
}
if (sCookieID.Length > 0)
{
oCookie.Value = sCookieID.Substring(0, sCookieID.Length - 1);
}
else
{
oCookie.Value = "";
}
//Add back into the HttpContext.Current.Response Objects.
HttpContext.Current.Response.Cookies.Add(oCookie);
}
}
}
//为了方便我直接把id和订购量写死了
CCookieShoppingCart.AddToShoppingCart(2,1)
购物车页面前台代码：
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateField HeaderText="ProductName">
<ItemTemplate>
<%# DataBinder.Eval(Container.DataItem,"Counter") %>
. <a href="Product.aspx?+id=<%# DataBinder.Eval(Container.DataItem,"ProductID") %>">
<%# DataBinder.Eval(Container.DataItem,"ProductName") %></a>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="d">
<ItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text=<%# DataBinder.Eval(Container.DataItem,"amount") %>></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="price">
<ItemTemplate>
<%# Eval("price") %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<a href="ShoppingCart.aspx?action=remove&id=<%# DataBinder.Eval(Container.DataItem,"ProductID") %>">
Remove</a> </td>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView
购物车页面后台代码：
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindData();
}
}
private void BindData()
{
if (Request.Cookies["ShoppingCart"] != null)
{
HttpCookie oCookie = (HttpCookie)Request.Cookies["ShoppingCart"];
string sProductID = oCookie.Value.ToString();
if (sProductID.Length == 0)
{
lblMsg.Text = "<B>No items in your shopping cart<B><BR>";
}
else
{
char[] sep = { ',' };
string[] sArrProdID = sProductID.Split(sep);
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("ProductID"));
dt.Columns.Add(new DataColumn("ProductName"));
dt.Columns.Add(new DataColumn("Counter"));
dt.Columns.Add(new DataColumn("amount"));
dt.Columns.Add(new DataColumn("price"));
int counter = 1;
for (int i = 0; i < sArrProdID.Length; i++)
{
DataTable dtt = DAL.product.getViewById(Convert.ToInt32(sArrProdID[i].ToString().Remove(sArrProdID[i].IndexOf('*'))));
DataRow dr = dt.NewRow();
dr["ProductID"] = sArrProdID[i].Remove(sArrProdID[i].IndexOf('*'));
dr["ProductName"] = dtt.Rows[0]["productname"].ToString();
dr["Counter"] = counter;
dr["amount"] = sArrProdID[i].Substring(sArrProdID[i].IndexOf('*')+1);
dr["price"] = dtt.Rows[0]["price"].ToString();
dt.Rows.Add(dr);
counter++;
}
GridView1.DataSource = dt;
GridView1.DataBind();
//GridView1.Columns[3].Visible = false;
}
}