Asp.net 基础9（状态管理之Session，实例购物车简单代码）

代码

    public class Global : System.Web.HttpApplication
    {
        //...
        protected void Session_Start(object sender, EventArgs e)
        {
            //初始化，购物车session
            Session["Cart"] = new ArrayList();
            Logger.Log(string.Format("会话加入：{0}",Context.Session.SessionID));
        }
    }

购买铅笔的页面：

代码

    public partial class BuyPencileForm : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            ArrayList arry = (ArrayList)Session["Cart"];
            arry.Add(new Cart("Pencile", 10));
        }
    }

购买钢笔的页面:

代码

    public partial class BuyRedPenForm : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            //结算：
            Response.Redirect("TotalForm.aspx");
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            ArrayList arry = (ArrayList)Session["Cart"];
            arry.Add(new Cart("RedPeng", 30));
        }
    }

结算页面：

代码

    public partial class TotalForm : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            int totalCount = 0;
            ArrayList list = (ArrayList)Session["Cart"];
            foreach (Cart item in list)
            {
                totalCount += item.Cost;
                Response.Output.WriteLine(string.Format("货物名称：{0}，货物价格:{1}", item.Description, item.Cost.ToString()));
                Response.Output.WriteLine("<br />");
            }
            Response.Output.WriteLine(string.Format("总数：{0}",totalCount.ToString()));
        }
    }

购买页面时在session加入变量，结算页面读取Session。