buy.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

public partial class Buy : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.Params["id"] == "")
        {
            Response.Redirect("Index.aspx");
        }
        if (Session["People"] == null)
        {
            Response.Write(Database.MessageBox("请登录后购买商品", "Index.aspx"));
        }

        if (!IsPostBack)
        { 
         binder();
        }
       
        

    }
    public void binder()
    {
        this.id.Text = Session["id"].ToString();
        this.Proname.Text = Session["Proname"].ToString();
        this.MemberPrice.Text = Session["MemberPrice"].ToString();
    }
    #region 创建购物车临时表
    public DataTable cart()//创建购物车临时表
    {
        DataTable dt = new DataTable("cart");
        DataColumn dc = dt.Columns.Add("id", typeof(int));
        dt.Columns.Add("Proname", typeof(string));
        dt.Columns.Add("MemberPrice", typeof(string));
        dt.Columns.Add("Num", typeof(string));
        return dt;
    }
    #endregion 
    protected void Button2_Click(object sender, EventArgs e)
    {
        #region 购物车不存在则创建
        if (Session["cart"] == null)
        {
            DataTable dt = cart();
            DataRow dr = dt.NewRow();
            dr["id"] =Convert.ToInt32(this.id.Text);
            dr["Proname"] =this.Proname.Text;
            dr["MemberPrice"] = this.MemberPrice.Text;
            dr["Num"] = this.num.Text;
            dt.Rows.Add(dr);
            Session["cart"] = dt;
            Response.Write(Database.MessageBox("添加成功", "Mycategory.aspx"));

        }
        #endregion
        #region 购物车存在则查找产品存在改变数量
        else
        {
            bool find = false;
            DataTable dt = (DataTable)Session["cart"];
            int i;
            for (i = 0; i < dt.Rows.Count; i++)
            {
                if (this.Proname.Text.Trim() == dt.Rows[i]["Proname"].ToString().Trim())
                {
                    find = true;
                    break;
                }
            }
            if (find)
            {
              
                dt.Rows[i]["Num"] = Convert.ToInt32(dt.Rows[i]["Num"]) + Convert.ToInt32(this.num.Text.ToString());
                Response.Write(Database.MessageBox("添加成功", "Mycategory.aspx"));
            }
            #endregion
        #region 购物车存在则查找产品不存在添加
        else
        {
                DataRow dr = dt.NewRow();
                dr["id"] =Convert.ToInt32(this.id.Text);
                dr["Proname"] =this.Proname.Text;
                dr["MemberPrice"] = this.MemberPrice.Text;
                dr["Num"] = this.num.Text;
                dt.Rows.Add(dr);
                Response.Write(Database.MessageBox("添加成功", "Mycategory.aspx")); 
        }
        #endregion
    
        Session["cart"] = dt;
      
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect("index.aspx");
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        Response.Redirect("Mycategory.aspx");
    }
}