Webform购物车（用Session存储，页面传值）

购物车主要实现的功能：

    ①在主页面可以将所有商品显示出来，包括价格，库存。

    ②点击购买可以累加产品，如果是同一种产品，只会累加每种产品的数量。

    ③查看购物车，可以查看明细，包括所购物品的名称，价格，数量等等。由于这里的OrderDetails表没有水果名称和价格，所以需要扩展（Paitial）OrderDetails属性。

    ④在购物车中可以下订单，当点击下订单的时候，需要判断是否已经登录，如果没有登录，则跳到登录页面。

    ⑤下订单之后，客户的余额减少幅度等于所消费幅度。

　 ⑥余额不足，提示。

    ⑦库存不足，提示。

    ⑧购物车清空。

    ⑨库存产品数量减少，减少的每种产品的数量等于购买的每种产品的数量。

    下面用代码来详细介绍一下购物车功能的实现：

   

①Main页面，实现功能①，显示所有物品。

aspx代码:

 1 <body>
 2     <form id="form1" runat="server">
 3     <div>
 4         <h1>大苹果购物网</h1>
 5         <p>&nbsp;</p>
 6         
 7         <div style="float:left; 150px; height:500px;">
 8 
 9             <br />
10             <br />
11             <br />
12             <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">浏览商品</asp:LinkButton>
13             <br />
14             <br />
15             <br />
16             <asp:LinkButton ID="LinkButton2" runat="server" OnClick="LinkButton2_Click">查看账户</asp:LinkButton>
17             <br />
18             <br />
19             <br />
20             <asp:LinkButton ID="LinkButton3" runat="server" OnClick="LinkButton3_Click">查看购物车</asp:LinkButton>
21 
22         </div>
23         <div style =" float:left; height:500px;">
24 
25             <asp:Repeater ID="Repeater1" runat="server">
26                    <HeaderTemplate>
27                         <table width="600" border="0" cellspacing="1" cellpadding="0" bgcolor="#6600FF">
28                           <tr>
29                             <td height="25" bgcolor="#FFFFFF">代号</td>
30                             <td bgcolor="#FFFFFF">水果名称</td>
31                             <td bgcolor="#FFFFFF">水果价格</td>
32                             <td bgcolor="#FFFFFF">源产地</td>
33                             <td bgcolor="#FFFFFF">库存</td>
34                             <td bgcolor="#FFFFFF">操作</td>
35                           </tr>
36                    </HeaderTemplate>
37                     <ItemTemplate>
38 
39                             <tr>
40                                 <td height="25" bgcolor="#FFFFFF"><%#Eval("Ids") %></td>
41                                 <td bgcolor="#FFFFFF"><%#Eval("Name") %></td>
42                                 <td bgcolor="#FFFFFF"><%#Eval("Price") %></td>
43                                 <td bgcolor="#FFFFFF"><%#Eval("Source") %></td>
44                                 <td bgcolor="#FFFFFF"><%#Eval("Numbers") %></td>
45                                 <td bgcolor="#FFFFFF"><a href="ChuLi.aspx?code=<%#Eval("Ids") %>">购买</a></td>
46                               </tr>
47                     </ItemTemplate>
48                 <FooterTemplate>
49                       </table>
50                 </FooterTemplate>
51             </asp:Repeater>
52 
53             <br />
54 
55             <br />
56             <asp:Label ID="lblTs" runat="server"></asp:Label>
57 
58         </div>
59 
60     
61     </div>
62     </form>
63 </body>
View Code

aspx.cs代码:

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.UI;
 6 using System.Web.UI.WebControls;
 7 
 8 public partial class Main : System.Web.UI.Page
 9 {
10     protected void Page_Load(object sender, EventArgs e)
11     {
12         if (!IsPostBack)
13         {
14             if (Session["uid"] != null)
15             {
16                 FirutDataContext context = new FirutDataContext();
17 
18                 Repeater1.DataSource = context.Fruit;
19                 Repeater1.DataBind();
20 
21                 if (Session["Cart"] != null)
22                 {
23                     List<OrderDetails> list = Session["Cart"] as List<OrderDetails>;
24 
25                     int sl = list.Count();
26                     decimal zj = Convert.ToDecimal( list.Sum(p => p.Count * p.JiaGe));
27 
28                     lblTs.Text = "购物车中有："+sl+"件商品，总价为："+zj+"元。";
29 
30                 }
31 
32             }
33             else
34             {
35                 Response.Redirect("DengLu.aspx");
36             }
37         }
38     }
39     protected void LinkButton1_Click(object sender, EventArgs e)
40     {
41         Response.Redirect("Main.aspx");
42     }
43     protected void LinkButton2_Click(object sender, EventArgs e)
44     {
45         Response.Redirect("YuE.aspx");
46     }
47     protected void LinkButton3_Click(object sender, EventArgs e)
48     {
49         Response.Redirect("GouWuChe.aspx");
50     }
51 }
View Code

②实现功能②，点击购买时，存放在session[]里面(由于只是实现购买功能，不显示页面，所以只写方法)

aspx.cs代码:

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.UI;
 6 using System.Web.UI.WebControls;
 7 
 8 public partial class ChuLi : System.Web.UI.Page
 9 {
10     protected void Page_Load(object sender, EventArgs e)
11     {
12         //接收购买的水果代号
13          string code = Request["code"].ToString();
14        //先判断购物车是否为空
15      //如果不为空，再进入查询购物车包不包含本产品，不包含直接添加，包含，值增加数量；
16         if (Session["Cart"] != null)
17         {
18             //把SESSION[]购物车的数值转化为集合
19             List<OrderDetails> listall = Session["Cart"] as List<OrderDetails>;
20            //按照点击购买时传过来的水果代号查询
21             var query = listall.Where(p => p.FruitCode == code);
22             //如果购物车购买过本水果产品，实现购买，数量加1
23             if (query.Count() > 0)
24             {
25                 OrderDetails data1 = query.First();
26                 //listall.Remove(data1);
27                 data1.Count = data1.Count + 1;
28                 //listall.Add(data1);
29 
30                 Session["Cart"] = listall;
31 
32             }
33            //如果没有购买过本水果产品，新建集合，存储购买的水果
34             else
35             {
36                 OrderDetails data2 = new OrderDetails();
37 
38                 data2.FruitCode = code;
39                 data2.Count = 1;
40 
41                 listall.Add(data2);
42 
43                 Session["Cart"] = listall;
44             }
45             
46 
47 
48         }
49       //如果购物车是空的，直接购买本产品
50         else
51         {
52             FirutDataContext context = new FirutDataContext();
53 
54             List<OrderDetails> list = new List<OrderDetails>();
55 
56             OrderDetails data = new OrderDetails();
57 
58             data.FruitCode = code;
59             data.Count = 1;
60 
61             list.Add(data);
62 
63             Session["Cart"] = list;
64 
65 
66         }
67        //跳会主页面
68         Response.Redirect("Main.aspx");
69         
70     }
71 }
View Code

③实现功能③，查看购物车，首先OrderDetails表没有水果名称和价格，显扩展属性；

扩展属性代码：

 1 public partial class OrderDetails
 2 {
 3     private decimal jiaGe;
 4 
 5     public decimal JiaGe
 6     {
 7         get 
 8         {
 9             FirutDataContext context = new FirutDataContext();
10 
11             var query = context.Fruit.Where(p=>p.Ids == FruitCode);
12 
13             Fruit data = query.First();
14 
15 
16             return  data.Price.Value; 
17         }
18         set { jiaGe = value; }
19     }
20 
21     private string shangPinName;
22 
23     public string ShangPinName
24     {
25         get {
26             FirutDataContext context = new FirutDataContext();
27 
28             var query = context.Fruit.Where(p => p.Ids == FruitCode);
29 
30             Fruit data = query.First();
31 
32 
33             return data.Name; 
34         }
35         set { shangPinName = value; }
36     }
37 
38 
39 
40 }
View Code

购物车效果图:

aspx代码:

 1 <body>
 2     <form id="form1" runat="server">
 3    <div>
 4         <h1>购物车</h1>
 5         <p>&nbsp;</p>
 6         
 7         <div style="float:left; 150px; height:500px;">
 8 
 9             <br />
10             <br />
11             <br />
12             <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">浏览商品</asp:LinkButton>
13             <br />
14             <br />
15             <br />
16             <asp:LinkButton ID="LinkButton2" runat="server" OnClick="LinkButton2_Click">查看账户</asp:LinkButton>
17             <br />
18             <br />
19             <br />
20             <asp:LinkButton ID="LinkButton3" runat="server" OnClick="LinkButton3_Click">查看购物车</asp:LinkButton>
21 
22         </div>
23         <div style =" float:left; height:500px;">
24 
25            
26           
27           
28 
29 
30             <asp:Repeater ID="Repeater1" runat="server">
31                    <HeaderTemplate>
32                         <table width="600" border="0" cellspacing="1" cellpadding="0" bgcolor="#6600FF">
33                           <tr>
34                             <td height="25" bgcolor="#FFFFFF">商品名称</td>
35                             <td bgcolor="#FFFFFF">商品单价</td>
36                             <td bgcolor="#FFFFFF">购买数量</td>
37                             <td bgcolor="#FFFFFF">操作</td>
38                           </tr>
39                    </HeaderTemplate>
40                     <ItemTemplate>
41 
42                             <tr>
43                                 <td height="25" bgcolor="#FFFFFF"><%#Eval("ShangPinName") %></td>
44                                 <td bgcolor="#FFFFFF"><%#Eval("JiaGe") %></td>
45                                 <td bgcolor="#FFFFFF"><%#Eval("Count") %></td>
46                                 <td bgcolor="#FFFFFF"><a href="ShanChu.aspx?code=<%#Eval("FruitCode") %>">删除</a></td>
47                               </tr>
48                     </ItemTemplate>
49                 <FooterTemplate>
50                       </table>
51                 </FooterTemplate>
52             </asp:Repeater>
53 
54             <br />
55 
56             <br />
57             <asp:Label ID="lblTs" runat="server" ForeColor="#CC0000"></asp:Label>
58 
59             <br />
60             <br />
61             <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="提交订单" />
62             <br />
63             <br />
64             <asp:Label ID="lblSure" runat="server" ForeColor="#CC0000"></asp:Label>
65             <br />
66 
67         </div>
68 
69     
70     </div>
71     </form>
72 </body>
View Code

aspx.cs代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class GouWuChe : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
             //先判断购物车是否为空，不为空显示购物车内容，如果为空进行提示
            if (Session["Cart"] != null)
            {
                List<OrderDetails> list = Session["Cart"] as List<OrderDetails>;
                Repeater1.DataSource = list;
                Repeater1.DataBind();


            }
            else
            {
                lblTs.Text = "购物车中没有任何商品！";
            }


        }
    }

    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        Response.Redirect("Main.aspx");
    }
    protected void LinkButton2_Click(object sender, EventArgs e)
    {
        Response.Redirect("YuE.aspx");
    }
    protected void LinkButton3_Click(object sender, EventArgs e)
    {
        Response.Redirect("GouWuChe.aspx");
    }
    //点击提交按钮时，先看验证库存是否足够，用户是否登陆，当二者都满足时，然后在进数据库执行删除
    protected void Button1_Click(object sender, EventArgs e)
    {
        List<OrderDetails> list = Session["Cart"] as List<OrderDetails>;

        FirutDataContext context = new FirutDataContext();
         
        bool IsOk = true;//定义BOOL类型的变量
       //先验证库存，购物车的商品分别进入数据库进行查询，看看库存满足不
        foreach (OrderDetails data in list)
        {
            int sl = data.Count.Value;

            var query = context.Fruit.Where(p=>p.Ids == data.FruitCode);

            int kc = query.First().Numbers.Value;
           //判断购买的数量和库存数量
            if (sl <= kc)
            {
                IsOk = IsOk && true;
            }
            else
            {
                IsOk = IsOk && false;
                lblSure.Text += query.First().Name +"的库存不足！ ";
            }


        }
        //如果库存满足，再进行验证用户是否登录
        if (IsOk)
        {   
            //如果用户登录成功，再判断该用户的余额是否满足购买商品的总额
            if (Session["uid"] != null)
            {
                string uid = Session["uid"].ToString();

                var query = context.Login.Where(p=>p.UserName == uid);

                decimal ye = query.First().Account.Value;

                decimal zj = list.Sum(p => p.JiaGe * p.Count).Value;

              //如果余额满足，再进行减数量，减余额，添加订单详情表
                if (ye >= zj)
                {
                    //减库存
                    foreach (OrderDetails data in list)
                    {
                        int sl = data.Count.Value;

                        var query2 = context.Fruit.Where(p => p.Ids == data.FruitCode);

                        query2.First().Numbers = query2.First().Numbers.Value - data.Count;

                        context.SubmitChanges();

                    }

                    //减余额
                    var query3 = context.Login.Where(p=>p.UserName == uid);
                    query3.First().Account = query3.First().Account.Value - zj;
                    context.SubmitChanges();

                    //添加订单
                    Orders data1 = new Orders();

                    Random r = new Random();

                    string ordercode = DateTime.Now.ToString("yyyyMMddHHmmssms") + r.Next(100).ToString();

                    data1.Code = ordercode;
                    data1.UserName = uid;
                    data1.OrderTime = DateTime.Now;

                    context.Orders.InsertOnSubmit(data1);
                    context.SubmitChanges();

                    //添加订单详情表

                    foreach (OrderDetails data in list)
                    {
                        data.OrderCode = ordercode;

                    }
                    context.OrderDetails.InsertAllOnSubmit(list);
                    context.SubmitChanges();

                }
             //如果余额不满足，进行提示
                else
                {
                    lblSure.Text +="余额不足！";
                }
            }
            else
            {
                Response.Redirect("DengLu.aspx");
            }


        }




    }
}

购物车中有删除功能，不需要显示页面，只执行删除方法，代码如下：：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class ShanChu : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        List<OrderDetails> list = Session["Cart"] as List<OrderDetails>;

        string code = Request["code"].ToString();


        var query = list.Where(p => p.FruitCode == code);

        if (query.First().Count.Value > 1)
        {
            query.First().Count--;
        }
        else
        {
            list.Remove(query.First());
        }

        Session["Cart"] = list;

        Response.Redirect("GouWuChe.aspx");
        
    }
}
View Code

④实现用户登录功能：

aspx代码:

<body>
    <form id="form1" runat="server">
          <center>
    <div>
    
        <asp:Label ID="Label1" runat="server" Text="用户名："></asp:Label>
        <asp:TextBox ID="txtuid" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:Label ID="Label2" runat="server" Text="密码："></asp:Label>
&nbsp;
        <asp:TextBox ID="txtpwd" runat="server" TextMode="Password"></asp:TextBox>
        <br />
        <br />
        <asp:Button ID="btnLogin" runat="server" Text="登录" OnClick="btnLogin_Click" />
    
        <br />
        <br />
    
    </div>
            </center>
        <asp:Literal ID="Literal1" runat="server"></asp:Literal>
    </form>
    
</body>

aspx.cs代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

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

    }
    protected void btnLogin_Click(object sender, EventArgs e)
    {
        string uid = txtuid.Text;
        string pwd = txtpwd.Text;

        FirutDataContext context = new FirutDataContext();

        var query = context.Login.Where(p => p.UserName == uid && p.Password == pwd);

        if (query.Count() > 0)
        {
            Session["uid"] = uid;

            Response.Redirect("Main.aspx");

        }
        else
        {
            Literal1.Text = "<script type='text/javascript'>alert('用户名或密码错误！');</script>";
        }
    }
}
View Code

⑤实现功能查看账户余额功能

等待添加，，，，
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原文地址：https://www.cnblogs.com/franky2015/p/4874659.html