快要答辩了，求大哥哥，大姐姐帮帮忙

Question

哪位大哥，大姐，可以帮助小弟的 ，快要考试答辩了，还有点购物车不怎么懂，求帮完善一下，可以留下联系方式，asp.net,不会耽误大家太多时间的，因为很简单（嘿嘿），拜托了，拜托了

Answer 1

网上很多，使用cookie或者session保存一张表，记录产品id、数量。

Answer 2

还有删除。编辑购物车商品不会做是单层架构。。
前台代码：<%@ Page Title="" Language="C#" MasterPageFile="~/MemberPortal/MainSite.master" AutoEventWireup="true" CodeFile="Shopping.aspx.cs" Inherits="MemberPortal_Shopping" %><asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <div style=" text-align:left;">
<h1><img src="image/shopping.gif" width="121" height="21" /></h1>
<p style=" font-size:18px; font:幼圆;" >您选好的商品:<asp:Label ID="Label1" runat="server" 
                Text="Label" Visible="False"></asp:Label>
        </p>

</div>
    <br /><div>
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        Width="100%" BackColor="White" BorderColor="#999999" BorderStyle="None" 
            BorderWidth="1px" CellPadding="3" GridLines="Vertical" ShowFooter="True" 
            onrowdatabound="GridView1_RowDataBound" 
            onrowcommand="GridView1_RowCommand" onrowdeleting="GridView1_RowDeleting">
        <AlternatingRowStyle BackColor="#DCDCDC" />
        <Columns>
            <asp:TemplateField HeaderText="图书编号">
                
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Eval("BookId") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="图书名称" FooterText="合计">
               
                <ItemTemplate>
                    <asp:Label ID="Label2" runat="server" Text='<%# Eval("BookName") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="单价">
               
                <ItemTemplate>
                    <asp:Label ID="Label3" runat="server"  Text='<%# Eval("UnitPrice") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="商品个数">
                <ItemTemplate>
                    <asp:Label ID="Label4" runat="server" Text='<%# Bind("Number") %>'></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("Number") %>'></asp:TextBox>
                </EditItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="小计">
                              <ItemTemplate>
                                
                                  <asp:Label ID="Label5"  Text="" runat="server"></asp:Label>
                                
                              </ItemTemplate>
                              <EditItemTemplate>
                                  <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                              </EditItemTemplate>
                            </asp:TemplateField>            <asp:TemplateField HeaderText="操作" ShowHeader="False">
                <ItemTemplate>
                    <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Delete" Text="删除"></asp:LinkButton>
                    <asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Edit" Text="编辑"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
        <FooterStyle BackColor="#CCCCCC" ForeColor="Black" />
        <HeaderStyle BackColor="#000084" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
        <RowStyle BackColor="#EEEEEE" ForeColor="Black" />
        <SelectedRowStyle BackColor="#008A8C" Font-Bold="True" ForeColor="White" />
        <SortedAscendingCellStyle BackColor="#F1F1F1" />
        <SortedAscendingHeaderStyle BackColor="#0000A9" />
        <SortedDescendingCellStyle BackColor="#CAC9C9" />
        <SortedDescendingHeaderStyle BackColor="#000065" />
    </asp:GridView></div>
    <div style=" text-align:right; margin-top:10px;">
        <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/MemberPortal/image/balance.gif" /></div>
</asp:Content>后台代码：
public partial class MemberPortal_Shopping : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if(Request.QueryString["Op"]=="BuyBooks"){
                int bookId = Convert.ToInt32(Request.QueryString["bookId"]);
                BuyBooks(bookId);
            }
            if (Session["Cart"] != null)
            {
                BindCart();            }
            else {
                Label1.Text = "目前还没有购买任何图书";
            }
        }
            }    private void BindCart() {
        GridView1.DataSource = Session["Cart"];
        GridView1.DataBind();
        
    }
    private void BuildCart() {
        DataTable cart = new DataTable();
        cart.Columns.Add("BookId",typeof(Int32));
        cart.Columns.Add("BookName",typeof(string));
        cart.Columns.Add("UnitPrice", typeof(double));
        cart.Columns.Add("Number", typeof(Int32));
       
        Session["Cart"] = cart;
    }
    private void AppendBooks(int bookId,string bookName,double unitPrice,int number) { 
        DataTable cart =Session["Cart"] as DataTable;        DataRow dr = cart.NewRow();
        dr["BookId"]=bookId;
        dr["BookName"]=bookName;
        dr["UnitPrice"] = unitPrice;
        dr["Number"] = number;
        cart.Rows.Add(dr);
        Session["Cart"] = cart;    }
    private bool ExistBook(int bookId) {
        DataTable cart = Session["Cart"] as DataTable;        foreach (DataRow dr in cart.Rows) {
            if (Convert.ToInt32(dr["BookId"]) == bookId) {
                return true;
            }
        }
        return false;
    
    }    private void UpdateBooks(int bookId)
    {
        DataTable cart = Session["Cart"] as DataTable;        foreach (DataRow dr in cart.Rows)
        {
            if (Convert.ToInt32(dr["BookId"]) == bookId)
            {
                dr["Number"] = Convert.ToInt32(dr["Number"])+1;
               
            }
        }        Session["Cart"] = cart;
           }
    private void BuyBooks(int bookId) {
        string strConn = ConfigurationManager.ConnectionStrings["conn"].ConnectionString;
        SqlConnection conn = new SqlConnection(strConn);
        conn.Open();        string sql = "select * from Books where Id=@Id";
        SqlDataAdapter dr = new SqlDataAdapter(sql, conn);
        DataSet ds = new DataSet();
        SqlParameter[] paras = new SqlParameter[]{
            new SqlParameter("@Id",bookId),
           
        };
        dr.SelectCommand.Parameters.AddRange(paras);
        dr.Fill(ds, "CategoryTable");
        string bookName = ds.Tables["CategoryTable"].Rows[0][1].ToString();
        double unitPrice = Convert.ToDouble(ds.Tables["CategoryTable"].Rows[0][7].ToString());
        if (Session["Cart"] == null)
        {
            this.BuildCart();
            this.AppendBooks(bookId,bookName, unitPrice ,1);
        }
        else {
            if (ExistBook(bookId))
            {                this.UpdateBooks(bookId);            }
            else {
                this.AppendBooks(bookId, bookName, unitPrice ,1);
            }
        }
    
    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Attributes.Add("onmouseover", "currentcolor=this.style.backgroundColor;this.style.backgroundColor='#D3D7F5'");
            e.Row.Attributes.Add("onmouseout", "currentcolor=this.style.backgroundColor=currentcolor");            Label lblPrice = e.Row.FindControl("Label3") as Label;
            Label lblNumber = e.Row.FindControl("Label4") as Label;
            Label lblTotal = e.Row.FindControl("Label5") as Label;            double UnitPrice = Convert.ToDouble(lblPrice.Text);
            int Number = Convert.ToInt32(lblNumber.Text);
            double Total = UnitPrice * Number;
            lblTotal.Text = Total.ToString();        }
       
       
    }
    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
       
    }
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
      
    }
}

Answer 3

 <asp:TemplateField ShowHeader="False" HeaderText="操作" Visible="true">
                                    <ItemTemplate>
                                        <asp:LinkButton ID="Linkbutton1" runat="server" Text="修改" CommandName="lb_modify"
                                            CommandArgument='<%#Eval("Base_ID")%>'></asp:LinkButton>
                                        <asp:LinkButton ID="Linkbutton2" runat="server" Text="删除" CommandName="lb_del"
                                            CommandArgument='<%#Eval("Base_ID")%>'></asp:LinkButton>
                                    </ItemTemplate>
                                </asp:TemplateField>后台：
  protected void GridView_BD_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            string _id = e.CommandArgument.ToString();
            
            if(e.CommandName=="lb_modify")
            {
                          修改写这里   
            }
            if (e.CommandName == "lb_del")
            {
                           删除写这里              
            }
        }

Answer 4

LZ给力啊，还没毕业就能自己写代码了，我大学时候只顾着玩CS了

Answer 5

感谢提醒帮助，搞定了我是用gridview内置的编辑、删除，还有小计合计都做完了。。就差提交生成订单了。。嘿嘿

Answer 6

用Hashtable或者Dictionary保存数据.
键保存的是商品的ID，值保存的是商品的数据.