实现购物车详细代码vs03

zoukankan html css js c++ java

实现购物车详细代码vs03

1<%@ Page language="c#" CodeFile="Default2.aspx.cs" AutoEventWireup="false" Inherits="myshop.shoppingcart" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD>
2<title>shoppingcart</title>
3<meta http-equiv="Content-Type" content="text/html;
4charset=gb2312"> <LINK href="mycss.css" type="text/css" rel="stylesheet">
5<meta name="vs_defaultClientScript" content="JavaScript">
6<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD>
7<body> <center>
8<form id="Form1" runat="server"> <table width="500" border="0" cellspacing="0" cellpadding="0"> <tr> <td>
9<asp:DataGrid id="ShoppingCartDlt" runat="server" Width="500" BackColor="white" BorderColor="black" ShowFooter="false" CellPadding="3" CellSpacing="0" Font-Name="Verdana" Font-Size="8pt" HeaderStyle-BackColor="#cecfd6" AutoGenerateColumns="false" MaintainState="true"> <Columns>
10<asp:TemplateColumn HeaderText="删除">
11<ItemTemplate> <center>
12<asp:CheckBox id="chkProductID" runat="server" /> </center>
13</ItemTemplate> </asp:TemplateColumn>
14<asp:BoundColumn DataField="ProdID" HeaderText="ID" />
15<asp:BoundColumn DataField="ProName" HeaderText="商品名称" />
16<asp:BoundColumn DataField="UnitPrice" HeaderText="单价" />
17<asp:TemplateColumn HeaderText="数量">
18<ItemTemplate>
19<asp:TextBox id="CountTb" runat="server" Text='<%#DataBinder.Eval( Container.DataItem,"ProdCount" )%>'> </asp:TextBox>
20</ItemTemplate> </asp:TemplateColumn>
21<asp:BoundColumn DataField="TotalPrice" HeaderText="小计( 元 )" /> </Columns> </asp:DataGrid></td> </tr> </table> <br> <table width="500" border="0" cellspacing="0" cellpadding="0"> <tr> <td>
22<asp:Button id="update" runat="server" Text="更新我的购物车" CssClass="button2" OnClick="update_Click" /></td> <td>
23<asp:Button id="CheckOut" runat="server" Text="结算" CssClass="button5" />
24
25<input type="button" name="close2" value="继续购物" onClick="window.close( );
26return false;
27" class="button2"></td> <td align="right"><br>
28<asp:Label id="label" runat="server" Width="100px" Visible="True" ForeColor="#FF8080" Height="18px"></asp:Label></td> </tr> </table>
29</form> </center>
30</body></HTML>

  1using System;
  2using System.Collections;
  3using System.ComponentModel;
  4using System.Web.SessionState;
  5using System.Web;
  6using System.Web.UI;
  7using System.Web.UI.HtmlControls;
  8using System.Web.UI.WebControls;
  9using System.Data;
10using System.Data.OleDb;
11using System.Configuration;
12namespace myshop
13{
14    /**//// <summary＞ /// shoppingcart 的摘要说明. /// </summary＞
15    public class shoppingcart : System.Web.UI.Page
16    {
17        string AddProID;
18        private void Page_Load(object sender, System.EventArgs e)
19        {
20            try
21            {
22                if (Session["logon"] != "yes" || Session["username"] == null)
23                {
24                    Response.Redirect("error.htm");
25                }
26            }
27            catch
28            {
29                Response.Redirect("error.htm");
30            }
31            /**//////////////查看用户是否已经登陆.
32            if (!IsPostBack)
33            {
34                if (Request.Params["mode"] == "view") //检测是否为直接查看购物车.
35                {
36                    ViewShoppingCart();
37                    Caculator();
38                }
39                if (Request.Params["productID"] != null || Request.Params["productID"] != "")
40                {
41                    AddProID = Request["productID"];
42                    UpdateShoppingCart();
43                    Caculator();
44                }
45            }
46            // 在此处放置用户代码以初始化页面
47        }
48        public void CreateCartTable() //创建购物车
49        {
50            DataSet ds = new DataSet();
51            DataTable newDT = new DataTable("CartTable");
52            ds.Tables.Add(newDT);
53            DataColumn newDC;
54            newDC = new DataColumn("ProdID", System.Type.GetType("System.Int32"));
55            ds.Tables["CartTable"].Columns.Add(newDC);
56            newDC = new DataColumn("ProdCount", System.Type.GetType("System.Int32"));
57            newDC.DefaultValue = 1;
58            ds.Tables["CartTable"].Columns.Add(newDC);
59            newDC = new DataColumn("ProName", System.Type.GetType("System.String"));
60            ds.Tables["CartTable"].Columns.Add(newDC);
61            newDC = new DataColumn("UnitPrice", System.Type.GetType("System.Double"));
62            ds.Tables["CartTable"].Columns.Add(newDC);
63            newDC = new DataColumn("TotalPrice", System.Type.GetType("System.Double"));
64            ds.Tables["CartTable"].Columns.Add(newDC);
65            newDC = new DataColumn("IsDeleted", System.Type.GetType("System.Int32"));
66            newDC.DefaultValue = 0;
67            // public void WriteShoppingCart( ) 中 newDR[5]="0";行,已被注销, ds.Tables["CartTable"].Columns.Add( newDC );
68            Session["myCartTable"] = newDT;
69            ShoppingCartDlt.DataSource = ds.Tables["CartTable"].DefaultView;
70            ShoppingCartDlt.DataBind();
71        }
72
73        public void UpdateShoppingCart()
74        {
75            if (Session["myCartTable"] == null)//Session["myCartTable"]==null
76            {
77                CreateCartTable();
78                //调用函数CreateCartTable( )新建一个DataTable WriteShoppingCart( );
79            }
80            else
81            {
82                //如果购物蓝中已有商品,则需要对购物信息表DataTable进行更新,并将其棒定到ShoppingCartDlt WriteShoppingCart( );
83            }
84        }
85        public void ViewShoppingCart() //查看购物车
86        {
87            if (Session["myCartTable"] != null)
88            {
89                DataTable viewTable = new DataTable("nowCartTable");
90                viewTable = (DataTable)Session["myCartTable"];
91                ShoppingCartDlt.DataSource = viewTable.DefaultView;
92                //购物车棒定到ShoppingCartDlt ShoppingCartDlt.DataBind( );
93            }
94        }
95        public void WriteShoppingCart()
96        {
97            if (Request.Params["mode"] != "view") //检查是否是直接查看购物车,如果直接查看,就不再写MYCARTTABLE
98            {
99                DataTable nowTable = new DataTable("nowCartTable");
100                nowTable = (DataTable)Session["myCartTable"];
101                int pn = nowTable.Rows.Count;
102                int i = 0;
103                bool hasone = false;
104                int nowProdID;
105                while (i < pn && !hasone)
106                {
107                    nowProdID = Int32.Parse(nowTable.Rows[i][0].ToString());
108                    if (nowProdID == Int32.Parse(AddProID)) //判断购物信息表中,是否存有当前放入商品. if( nowProdID==Int32.Parse( AddProID ) )
109                    {
110                        hasone = true;
111                    }
112                    else
113                    {
114                        i++;
115                    }
116                }
117                if (hasone)
118                {
119                    //如果已有该商品,则 hasone=true,更改该数据行 DataRow oldDR;
120                    oldDR = nowTable.Rows[i];
121                    oldDR["ProdCount"] = Int32.Parse(oldDR["ProdCount"].ToString()) + 1;
122                    oldDR["TotalPrice"] = Int32.Parse(oldDR["ProdCount"].ToString()) * Double.Parse(oldDR["UnitPrice"].ToString());
123                }
124                else
125                {
126                    //如果没有该商品,在表中新加如一行. DataRow newDR;
127                    double unitp;
128                    String strcon = "provider=Microsoft.jet.OLEDB.4.0;data Source=" + Server.MapPath(ConfigurationSettings.AppSettings["MDBpath2"]) + ";";
129                    OleDbConnection myConnection = new OleDbConnection(strcon);
130                    string strSQL = "select * from pro where product_id=" + AddProID + "";
131                    OleDbDataAdapter myCommand = new OleDbDataAdapter(strSQL, myConnection);
132                    DataSet ds = new DataSet();
133                    myCommand.Fill(ds, "AddP");
134                    newDR = nowTable.NewRow();
135                    newDR[0] = AddProID;
136                    newDR[2] = ds.Tables["Addp"].Rows[0]["product_name"].ToString();
137                    unitp = Double.Parse(ds.Tables["AddP"].Rows[0]["product_memprice"].ToString());
138                    //会员价 newDR[3]=unitp;
139                    newDR[4] = unitp;
140                    //第一次读库,所以总价格和单价是一样的. //newDR[5]="0";
141                    nowTable.Rows.Add(newDR);
142                    myConnection.Close();
143                }
144                ShoppingCartDlt.DataSource = nowTable.DefaultView;
145                //将更新后的 DataTable棒定到ShoppingCartDlt ShoppingCartDlt.DataBind( );
146                Session["myCartTable"] = nowTable;
147                //重新保存更新过的DataTable
148            }
149        }
150        public void Caculator()
151        {
152            if (Session["myCartTable"] != null) //购物车是否为空
153            {
154                int h;
155                Double TotalPri;
156                TotalPri = 0;
157                DataTable nowTable3 = new DataTable("nowCartTable3");
158                nowTable3 = (DataTable)Session["myCartTable"];
159                if (nowTable3.Rows.Count > 0) //返回购物车中是否有货物
160                {
161                    for (h = 0;
162                    h <= nowTable3.Rows.Count - 1;
163                    h++)
164                    {
165                        TotalPri = TotalPri + Int32.Parse(nowTable3.Rows[h][4].ToString());
166                        //Double.Parse( ( string )TotalText.Text );
167                    }
168                    label.Text = "总计: " + TotalPri.ToString() + " 元";
169                }
170            }
171        }
172
173
174        public void Update()
175        {
176            int i;
177            int j;
178            int k;
179            ArrayList deleteItem = new ArrayList(10);
180            DataGridItem _item;
181            j = 0;
182            int deleteid;
183            k = 0;
184            DataTable nowTable2 = new DataTable("nowCartTable2");
185            nowTable2 = (DataTable)Session["myCartTable"];
186            for (i = 0;
187            i <= this.ShoppingCartDlt.Items.Count - 1;
188            i++)
189            {
190                _item = this.ShoppingCartDlt.Items[i];
191                TextBox CountText = (TextBox)this.ShoppingCartDlt.Items[i].Cells[4].FindControl("CountTb");
192                //Controls[1];
193                //_item.FindControl( "CountTb" );
194                CheckBox ProductIDCheck = (CheckBox)_item.FindControl("chkProductID");
195                nowTable2.Rows[i][1] = Int32.Parse(CountText.Text.ToString());
196                nowTable2.Rows[i][4] = Int32.Parse(nowTable2.Rows[i][1].ToString()) * Double.Parse(nowTable2.Rows[i][3].ToString());
197                if (ProductIDCheck.Checked)
198                {
199                    nowTable2.Rows[i][5] = 1;
200                    //添加删除标记1 j=j+1;
201                }
202            }
203            string strExpr = "IsDeleted>0";
204            //http://msdn.microsoft.com/library/chs/default.asp?url=/library/CHS/cpref/html/frlrfSystemDataDataTableClassSelectTopic.asp DataRow[] foundRows = nowTable2.Select( strExpr );
205            for (int m = 0;
206            m < foundRows.Length;
207            m++)
208            {
209                //Console.WriteLine( foundRows[i][0] );
210                foundRows[m].Delete();
211            }
212            ShoppingCartDlt.DataSource = nowTable2.DefaultView;
213            ShoppingCartDlt.DataBind();
214            Session["myCartTable"] = nowTable2;
215            Caculator();
216        }
217        Web 窗体设计器生成的代码
231        private void update_Click(object sender, System.EventArgs e)
232        {
233            Update();
234        }
235        private void CheckOut_Click(object sender, System.EventArgs e)
236        {
237            Update();
238            Response.Redirect("checkout.aspx");
239        }
240    }
241}

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原文地址：https://www.cnblogs.com/zwl12549/p/608915.html