用Repeater绑定购物车，实现添加商品、更改购买数量及删除选购的商品并合计出小计及总计

在商品展示页点击购买跳到购物车页面，用一个DataTable将购买的商品存放起来，并可以删除或更改购买数量、合计出最终购物车的小计及总计。

显示商品页面

1 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="shopCart.aspx.cs" Inherits="shopCart" %>
2
3 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4
5 <html xmlns="http://www.w3.org/1999/xhtml">
6 <head runat="server">
7     <title>无标题页</title>
8 </head>
9 <body>
10     <form id="form1" runat="server">
11     <table border="1" width="100%">
12         <tr>
13             <td>
14                 <table>
15                     <tr>
16                         <td>类别名称：</td>
17                     </tr>
18                     <asp:Repeater ID="RepProductType" runat="server">
19                         <ItemTemplate>
20                             <tr>
21                                 <td><a href='<%#"shopCart.aspx?productTypeID="+Eval("productTypeID")%>'><%#Eval("productTypeName") %></a></td>
22                             </tr>
23                         </ItemTemplate>
24                     </asp:Repeater>
25                 </table>
26             </td>
27             <td>
28                  <asp:DataList ID="DataList1" runat="server" RepeatColumns="3"
29                           RepeatDirection="Horizontal" Width="760px">
30                         <ItemTemplate>
31                           <table border="0" cellpadding="3" cellspacing="2">
32                               <tr>
33                                 <td colspan="2"><img src='UploadImages/<%#Eval("productPic") %>' width="150" height="150" /></td>
34                               </tr>
35                               <tr>
36                                 <td><%#Eval("productName")%></td>
37                                 <td><a href='<%#"shopCart1.aspx?productID="+Eval("productID") %>'>购买</a></td>
38                               </tr>
39                           </table>
40                         </ItemTemplate>
41                   </asp:DataList>
42             </td>
43         </tr>
44     </table>
45     </form>
46 </body>
47 </html>

购物车前台代码

1 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="shopCart1.aspx.cs" Inherits="shopCart1" %>
2
3 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4
5 <html xmlns="http://www.w3.org/1999/xhtml">
6 <head runat="server">
7     <title>无标题页</title>
8 </head>
9 <body>
10     <form id="form1" runat="server">
11     <table border="1">
12         <tr>
13             <td>商品号</td>
14             <td>商品名</td>
15             <td>单价</td>
16             <td>类型号</td>
17             <td>图片</td>
18             <td>购买数量</td>
19             <td>小计</td>
20             <td>更改数量</td>
21             <td>放回原处</td>
22         </tr>
23         <asp:Repeater ID="Repeater1" runat="server"
24             onitemcommand="Repeater1_ItemCommand" onitemdatabound="Repeater1_ItemDataBound">
25             <ItemTemplate>
26                 <tr>
27                     <td>
28                         <asp:Literal ID="LitProductID" runat="server" Text='<%#Eval("productID")%>'></asp:Literal></td>
29                     <td><%#Eval("productName")%></td>
30                     <td><%#Eval("unitPrice")%></td>
31                     <td><%#Eval("productTypeID")%></td>
32                     <td><img width="80" height="80" src='<%#"UploadImages/"+Eval("productPic") %>' /></td>
33                     <td id="TDcount" runat="server">
34                         <asp:Label ID="LblBuyCount" runat="server" Text='<%#Eval("buyCount")%>'></asp:Label>
35                         <asp:TextBox ID="TxtBuyCount" Visible="false" runat="server" Text='<%#Eval("buyCount")%>'></asp:TextBox>
36                     </td>
37                     <td><%#Eval("subtotal")%></td>
38                     <td>
39                         <asp:HyperLink ID="HLUpdateBuyCount" runat="server" NavigateUrl='<%#"shopCart1.aspx?cartProductID="+Eval("productID") %>'>更改数量</asp:HyperLink>
40                         <asp:LinkButton ID="LBtnUpdate" runat="server" Visible="false" onclick="LBtnUpdate_Click">更改</asp:LinkButton>
41                         <asp:LinkButton ID="LBtnCancel" runat="server" Visible="false"  onclick="LBtnCancel_Click">取消</asp:LinkButton>
42                     </td>
43                     <td><asp:ImageButton ID="ImgDel" title="删除" CommandName="delete" ImageUrl="Admin/HXImages/del.gif" runat="server" /></td>
44                 </tr>
45             </ItemTemplate>
46         </asp:Repeater>
47         <tr>
48             <td colspan="8" align="right">总计：</td>
49             <td>
50                 <asp:Label ID="LblTotal" runat="server" Text="Label"></asp:Label></td>
51         </tr>
52     </table>
53     <a href="shopCart.aspx">继续购物</a>
54     </form>
55 </body>
56 </html>
57

购物车后台代码

  1 using System;
  2 using System.Collections;
  3 using System.Configuration;
  4 using System.Data;
  5 using System.Linq;
  6 using System.Web;
  7 using System.Web.Security;
  8 using System.Web.UI;
  9 using System.Web.UI.HtmlControls;
10 using System.Web.UI.WebControls;
11 using System.Web.UI.WebControls.WebParts;
12 using System.Xml.Linq;
13 using System.Text;
14
15 public partial class ShopCart2 : System.Web.UI.Page
16 {
17     string sql = null;
18     DataSet ds = new DataSet();
19     protected void Page_Load(object sender, EventArgs e)
20     {
21         if (!IsPostBack)
22         {
23             if (productID != null)
24             {
25                 GetShopCart();
26             }
27             else
28             {
29                 Response.Redirect("shopCart.aspx");
30             }
31         }
32     }
33     #region//Create a shopCart and put the product into it
34     void GetShopCart()
35     {
36         if (Session["shopCart"] == null || Session["shopCart"] == "")
37         {
38             //there has no cart
39             CreateCartTable();
40         }
41         //there has a cart
42         PutInShopCart();
43     }
44     void PutInShopCart()
45     {
46         DataTable dt = new DataTable("myTable");
47         dt = (DataTable)Session["shopCart"];
48         bool hasone = false;
49         foreach (DataRow dr in dt.Rows)
50         {
51             if (int.Parse(productID) == Convert.ToInt32(dr["productID"]))
52             {
53                 //select the same product
54                 //buyCount plus one
55                 dr["buyCount"] = Convert.ToInt32(dr["buyCount"]) + 1;
56                 dr["subtotal"] = Convert.ToInt32(dr["buyCount"]) * Convert.ToDecimal(dr["unitPrice"]);
57                 hasone = true;
58                 break;
59             }
60             else
61             {
62                 hasone = false;
63             }
64         }
65         if (hasone == false)
66         {
67             //put the product into dt
68             sql = string.Format("select * from productTable where productID={0}", int.Parse(Request.QueryString["productID"]));
69             DataTable productTable = DataBase.ExecuteDataSet(sql).Tables[0];
70             DataRow rows;
71             rows = new DataTable("cartTable").NewRow();
72             int productID = Convert.ToInt32(productTable.Rows[0]["productID"]);
73             string productName = productTable.Rows[0]["productID"].ToString();
74             Decimal unitPrice = Convert.ToDecimal(productTable.Rows[0]["unitPrice"]);
75             int productTypeID = Convert.ToInt32(productTable.Rows[0]["productTypeID"]);
76             string productPic = productTable.Rows[0]["productPic"].ToString();
77             int buyCount = 1;
78             Decimal subtotal = buyCount * unitPrice;
79             dt.Rows.Add(productID, productName, unitPrice, productTypeID, productPic, buyCount, subtotal);
80         }
81         Session["shopCart"] = dt;
82         Repeater1.DataSource = dt.DefaultView;
83         Repeater1.DataBind();
84         GetTotal();
85     }
86     void CreateCartTable()
87     {
88         DataTable dtCart = new DataTable("cartTable");
89         DataColumn dc;
90         dc = new DataColumn("productID", System.Type.GetType("System.Int32"));
91         dtCart.Columns.Add(dc);
92         dc = new DataColumn("productName", System.Type.GetType("System.String"));
93         dtCart.Columns.Add(dc);
94         dc = new DataColumn("unitPrice", System.Type.GetType("System.Decimal"));
95         dtCart.Columns.Add(dc);
96         dc = new DataColumn("productTypeID", System.Type.GetType("System.Int32"));
97         dtCart.Columns.Add(dc);
98         dc = new DataColumn("productPic", System.Type.GetType("System.String"));
99         dtCart.Columns.Add(dc);
100         dc = new DataColumn("buyCount", System.Type.GetType("System.Int32"));
101         dtCart.Columns.Add(dc);
102         dc = new DataColumn("subtotal", System.Type.GetType("System.Decimal"));
103         dtCart.Columns.Add(dc);
104         ds.Tables.Add(dtCart);
105
106         //DataRow dr;
107         //dr = new DataTable("cartTable").NewRow();
108         //int productID = Convert.ToInt32(ds.Tables["productTable"].Rows[0]["productID"]);
109         //string productName = ds.Tables["productTable"].Rows[0]["productID"].ToString();
110         //Decimal unitPrice = Convert.ToDecimal(ds.Tables["productTable"].Rows[0]["unitPrice"]);
111         //int productTypeID = Convert.ToInt32(ds.Tables["productTable"].Rows[0]["productTypeID"]);
112         //string productPic = ds.Tables["productTable"].Rows[0]["productPic"].ToString();
113         //int buyCount = 1;
114         //Decimal subtotal = buyCount * unitPrice;
115         //dtCart.Rows.Add(productID, productName, unitPrice, productTypeID, productPic, buyCount, subtotal);
116         Session["shopCart"] = dtCart;
117         Repeater1.DataSource = dtCart.DefaultView;
118         Repeater1.DataBind();
119     }
120     #endregion
121     protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
122     {
123         if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
124         {
125             ((ImageButton)e.Item.FindControl("ImgDel")).Attributes.Add("onclick", "return confirm('确定要删除吗?')");
126             string nowProID = ((Literal)e.Item.FindControl("LitProductID")).Text.ToString();
127             ((TextBox)e.Item.FindControl("TxtBuyCount")).Attributes.Add("onfocus", "TxtBuyCountOnfocus(" + nowProID + ")");
128         }
129     }
130     protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
131     {
132         int proID = Convert.ToInt32(((Literal)e.Item.FindControl("LitProductID")).Text.ToString());
133         DataTable dt = (DataTable)Session["shopCart"];
134         for (int i = 0; i < dt.Rows.Count; i++)
135         {
136             if (Convert.ToInt32(dt.Rows[i]["productID"]) == proID)
137             {
138                 //delete this row
139                 dt.Rows.RemoveAt(i);
140             }
141         }
142         Session["shopCart"] = dt;
143         Repeater1.DataSource = dt.DefaultView;
144         Repeater1.DataBind();
145         GetTotal();
146     }
147     void GetTotal()
148     {
149         decimal total = 0;
150         DataTable dt = (DataTable)Session["shopCart"];
151         for (int i = 0; i < dt.Rows.Count; i++)
152         {
153             total += Convert.ToDecimal(dt.Rows[i]["subtotal"]);
154         }
155         LblTotal.Text = total.ToString();
156     }
157     #region//update your buy products' count
158     protected void TxtBuyCount_TextChanged(object sender, EventArgs e)
159     {
160         DataTable dt = (DataTable)Session["shopCart"];
161         //找出当前文本框所在行的productID来
162         int cartProductID = Convert.ToInt32(TxtProductID.Text);
163         bool b = true;
164         for (int i = 0; i < Repeater1.Items.Count; i++)
165         {
166             if (Convert.ToInt32(((Literal)Repeater1.Items[i].FindControl("LitProductID")).Text) == cartProductID)
167             {
168                 try
169                 {
170                     int nowBuyCount = Convert.ToInt32(((TextBox)Repeater1.Items[i].FindControl("TxtBuyCount")).Text);
171                     dt.Rows[i]["buyCount"] = nowBuyCount.ToString();
172                     dt.Rows[i]["subtotal"] = Convert.ToInt32(dt.Rows[i]["unitPrice"]) * nowBuyCount;
173                 }
174                 catch
175                 {
176                     Response.Write("<script>alert('数量输入有误！');</script>");
177                     b = false;
178                 }
179                 Repeater1.DataSource = dt.DefaultView;
180                 Repeater1.DataBind();
181                 GetTotal();
182                 if (b)
183                 {
184                     Response.Write("<script>alert('数量修改成功！');</script>");
185                 }
186             }
187         }
188     }
189     #endregion
190
191     public string productID
192     {
193         get
194         {
195             return Request.QueryString["productID"];
196         }
197     }
198 }
199

  1 using System;
  2 using System.Collections;
  3 using System.Configuration;
  4 using System.Data;
  5 using System.Linq;
  6 using System.Web;
  7 using System.Web.Security;
  8 using System.Web.UI;
  9 using System.Web.UI.HtmlControls;
10 using System.Web.UI.WebControls;
11 using System.Web.UI.WebControls.WebParts;
12 using System.Xml.Linq;
13
14 public partial class shopCart1 : System.Web.UI.Page
15 {
16     string sql = null;
17     DataSet ds = new DataSet();
18     protected void Page_Load(object sender, EventArgs e)
19     {
20         if (!IsPostBack)
21         {
22             if (productID != null)
23             {
24                 GetShopCart();
25             }
26             else
27             {
28                 if (cartProductID != null && cartProductID != "")
29                 {
30                     //update product's buyCount
31                     UpdateBuyCount();
32                 }
33                 else
34                 {
35                     Response.Redirect("shopCart.aspx");
36                 }
37             }
38         }
39     }
40     #region//Create a shopCart and put the product into it
41     void GetShopCart()
42     {
43         if (Session["shopCart"] == null||Session["shopCart"] =="")
44         {
45             //there has no cart
46             CreateCartTable();
47         }
48         PutInShopCart();
49     }
50     void PutInShopCart()
51     {
52         DataTable dt = new DataTable("myTable");
53         dt = (DataTable)Session["shopCart"];
54         bool hasone = false;
55         foreach (DataRow dr in dt.Rows)
56         {
57             if (int.Parse(productID) == Convert.ToInt32(dr["productID"]))
58             {
59                 //select the same product,buyCount plus one
60                 dr["buyCount"] = Convert.ToInt32(dr["buyCount"]) + 1;
61                 dr["subtotal"] = Convert.ToInt32(dr["buyCount"]) * Convert.ToDecimal(dr["unitPrice"]);
62                 hasone = true;
63                 break;
64             }
65             else
66             {
67                 hasone = false;
68             }
69         }
70         if (hasone == false)
71         {
72             //put the product into dt
73             sql = string.Format("select * from productTable where productID={0}", int.Parse(Request.QueryString["productID"]));
74             DataTable productTable = DataBase.ExecuteDataSet(sql).Tables[0];
75             DataRow rows;
76             rows = new DataTable("cartTable").NewRow();
77             int productID = Convert.ToInt32(productTable.Rows[0]["productID"]);
78             string productName = productTable.Rows[0]["productID"].ToString();
79             Decimal unitPrice = Convert.ToDecimal(productTable.Rows[0]["unitPrice"]);
80             int productTypeID = Convert.ToInt32(productTable.Rows[0]["productTypeID"]);
81             string productPic = productTable.Rows[0]["productPic"].ToString();
82             int buyCount = 1;
83             Decimal subtotal = buyCount * unitPrice;
84             dt.Rows.Add(productID, productName, unitPrice, productTypeID, productPic, buyCount,subtotal);
85         }
86         Session["shopCart"] = dt;
87         Repeater1.DataSource = dt.DefaultView;
88         Repeater1.DataBind();
89         GetTotal();
90     }
91     void CreateCartTable()
92     {
93         DataTable dtCart = new DataTable("cartTable");
94         DataColumn dc ;
95         dc = new DataColumn("productID", System.Type.GetType("System.Int32"));
96         dtCart.Columns.Add(dc);
97         dc = new DataColumn("productName", System.Type.GetType("System.String"));
98         dtCart.Columns.Add(dc);
99         dc = new DataColumn("unitPrice", System.Type.GetType("System.Decimal"));
100         dtCart.Columns.Add(dc);
101         dc = new DataColumn("productTypeID", System.Type.GetType("System.Int32"));
102         dtCart.Columns.Add(dc);
103         dc = new DataColumn("productPic", System.Type.GetType("System.String"));
104         dtCart.Columns.Add(dc);
105         dc = new DataColumn("buyCount", System.Type.GetType("System.Int32"));
106         dtCart.Columns.Add(dc);
107         dc = new DataColumn("subtotal", System.Type.GetType("System.Decimal"));
108         dtCart.Columns.Add(dc);
109         ds.Tables.Add(dtCart);
110
111         Session["shopCart"] = dtCart;
112         Repeater1.DataSource = dtCart.DefaultView;
113         Repeater1.DataBind();
114     }
115     #endregion
116     protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
117     {
118         if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
119         {
120             ((ImageButton)e.Item.FindControl("ImgDel")).Attributes.Add("onclick", "return confirm('确定要删除吗?')");
121         }
122     }
123     protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
124     {
125         int proID = Convert.ToInt32(((Literal)e.Item.FindControl("LitProductID")).Text.ToString());
126         DataTable dt = (DataTable)Session["shopCart"];
127         for (int i = 0; i < dt.Rows.Count;i++ )
128         {
129             if (Convert.ToInt32(dt.Rows[i]["productID"]) == proID)
130             {
131                 //delete this row
132                 dt.Rows.RemoveAt(i);
133             }
134         }
135         Session["shopCart"] = dt;
136         Repeater1.DataSource = dt.DefaultView;
137         Repeater1.DataBind();
138         GetTotal();
139     }
140     void GetTotal()
141     {
142         decimal total = 0;
143         DataTable dt = (DataTable)Session["shopCart"];
144         for (int i = 0; i < dt.Rows.Count; i++)
145         {
146             total += Convert.ToDecimal(dt.Rows[i]["subtotal"]);
147         }
148         LblTotal.Text = total.ToString();
149     }
150     #region//update your buy products' count
151     void UpdateBuyCount()
152     {
153         DataTable dt = (DataTable)Session["shopCart"];
154         Repeater1.DataSource = dt.DefaultView;
155         Repeater1.DataBind();
156         GetTotal();
157         for (int i = 0; i < Repeater1.Items.Count; i++)
158         {
159             if (Convert.ToInt32(((Literal)Repeater1.Items[i].FindControl("LitProductID")).Text) == int.Parse(cartProductID))
160             {
161                 ((Label)Repeater1.Items[i].FindControl("LblBuyCount")).Visible = false;
162                 ((TextBox)Repeater1.Items[i].FindControl("TxtBuyCount")).Visible = true;
163                 ((HyperLink)Repeater1.Items[i].FindControl("HLUpdateBuyCount")).Visible = false;
164                 ((LinkButton)Repeater1.Items[i].FindControl("LBtnUpdate")).Visible = true;
165                 ((LinkButton)Repeater1.Items[i].FindControl("LBtnCancel")).Visible = true;
166             }
167         }
168     }
169     protected void LBtnUpdate_Click(object sender, EventArgs e)
170     {
171         //get the Textbox's count
172         DataTable dt = (DataTable)Session["shopCart"];
173         for (int i = 0; i < Repeater1.Items.Count; i++)
174         {
175             if (Convert.ToInt32(((Literal)Repeater1.Items[i].FindControl("LitProductID")).Text) == int.Parse(cartProductID))
176             {
177                 int nowBuyCount = Convert.ToInt32(((TextBox)Repeater1.Items[i].FindControl("TxtBuyCount")).Text);
178                 dt.Rows[i]["buyCount"] = nowBuyCount.ToString();
179                 dt.Rows[i]["subtotal"] = Convert.ToInt32(dt.Rows[i]["unitPrice"]) * nowBuyCount;
180                 Repeater1.DataSource = dt.DefaultView;
181                 Repeater1.DataBind();
182                 GetTotal();
183             }
184         }
185     }
186     protected void LBtnCancel_Click(object sender, EventArgs e)
187     {
188         DataTable dt = (DataTable)Session["shopCart"];
189         Repeater1.DataSource = dt.DefaultView;
190         Repeater1.DataBind();
191         GetTotal();
192     }
193     #endregion
194
195     public string productID
196     {
197         get
198         {
199             return Request.QueryString["productID"];
200         }
201     }
202     public string cartProductID
203     {
204         get
205         {
206             return Request.QueryString["cartProductID"];
207         }
208     }
209 }
210

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原文地址：https://www.cnblogs.com/lotuslove/p/1710977.html