本文實例為大家分享了ASP.NET實現購物車的具體代碼,供大家參考,具體內容如下
1、 將test數據庫附加到數據庫管理系統中;數據庫中的book_info包含下列數據:

2、 新建一個網站,將images文件夾復制到網站中;
3、 在Default.aspx中,通過DataList控件展示數據庫中的所有數據,以行為主序,每行3列,單擊購買按鈕時,將商品的ID和數量保存到HashTable中,并將HashTable放置到Session中。

protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
{
string id = e.CommandArgument.ToString();
Hashtable ht;
if (Session["shopcar"] == null)
{
ht = new Hashtable();
ht.Add(id, 1);
Session["shopcar"] = ht;
}
else
{
ht = (Hashtable)Session["shopcar"];
if (ht.Contains(id))
{
int count = int.Parse(ht[id].ToString());
ht[id] = count + 1;
Session["shopcar"] = ht;
Response.Write(count + 1);
}
else
{
ht.Add(id, 1);
Session["shopcar"] = ht;
}
}
}
4、 在Default.aspx中添加一個超鏈接,鏈接到shopcart.aspx,在shopcart.aspx中顯示用戶購買的商品信息。
提示:

A、在shopcart中先定義下列變量:
Hashtable ht;
DataTable dt;
string connstring=@"DataSource=.\SQLEXPRESS;Initial Catalog=test;Integrated Security=True";
SqlConnection conn;
SqlCommand cmd;
SqlDataReader sdr;
B、頁面中添加一個GridView。
C、在page_load中,將dt實例化,建立各列。
protected void Page_Load(object sender, EventArgs e)
{
dt = new DataTable();
DataColumn col = new DataColumn();
col.ColumnName= "id";
col.DataType =System.Type.GetType("System.String");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName= "name";
col.DataType =System.Type.GetType("System.String");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName= "Num";
col.DataType =System.Type.GetType("System.Int32");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName= "price";
col.DataType =System.Type.GetType("System.Single");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName= "Total";
col.DataType =System.Type.GetType("System.Single");
dt.Columns.Add(col);
if (!IsPostBack)
{
Bind();
}
}
public void Bind()
{
if (Session["shopcar"] == null)
{
Response.Write("script>if(confirm('你沒有登錄')window.location='Default15.aspx';else window.close();/script>");
}
else
{
ht = (Hashtable)Session["shopcar"];
foreach (object item in ht.Keys)
{
string id = item.ToString();
int num = int.Parse(ht[item].ToString());
string sql = "selectbook_name,price from book_info where book_id='" + id + "'";
conn = new SqlConnection(connstring);
cmd = new SqlCommand(sql, conn);
conn.Open();
sdr =cmd.ExecuteReader();
if (sdr.HasRows)
{
sdr.Read();
DataRow row = dt.NewRow();
row["id"] = id;
row["Num"] = num;
row["name"] = sdr.GetString(0);
row["price"] =float.Parse(sdr[1].ToString());
row["total"] =num*(float.Parse(sdr[1].ToString()));
dt.Rows.Add(row);
}
sdr.Close();
conn.Close();
}
GridView1.DataSource = dt.DefaultView;
GridView1.DataBind();
}
}
D、這時可以看到用戶購買的商品,但不能修改數量,也不能刪除。
E、添加修改數量,刪除商品功能,在aspx頁面中定義GridView中的各列:
asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
Columns>
asp:BoundField DataField="id" HeaderText="ID" />
asp:BoundField DataField="name" HeaderText="名稱" />
asp:BoundField DataField="price" HeaderText="價格" />
asp:TemplateField>
ItemTemplate>
asp:TextBox runat="server" ID="textbox1" Text='%# Eval("Num") %>'
ontextchanged="textbox1_TextChanged" AutoPostBack="True" >/asp:TextBox>
/ItemTemplate>
/asp:TemplateField>
asp:BoundField DataField="total" HeaderText="總計" />
asp:TemplateField>
ItemTemplate>
asp:Button runat="server" ID="button1" CommandArgument='%# Eval("id") %>'
Text="刪除" onclick="button1_Click" />
/ItemTemplate>
/asp:TemplateField>
/Columns>
/asp:GridView>
F、為GridView中的文本框添加TextChanged事件:
protected void textbox1_TextChanged(object sender, EventArgs e)
{
Hashtable ht =(Hashtable)Session["shopcar"];
if (ht == null) return;
for (int i = 0; i GridView1.Rows.Count;i++)
{
string id =GridView1.Rows[i].Cells[0].Text.ToString();
Response.Write(id);
string num = ((TextBox)GridView1.Rows[i].FindControl("textbox1")).Text;
Response.Write(" "+num+"br />");
ht[id] = num;
}
Session["shopcar"] = ht;
Bind();
}
G、為按鈕添加單擊事件:
protected void button1_Click(object sender, EventArgs e)
{
string id = ((Button)sender).CommandArgument;
Hashtable ht = (Hashtable)Session["shopcar"];
if (ht == null) return;
ht.Remove(id);
Bind();
}
購物車代碼:showcart.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;
using System.Data;
using System.Data.SqlClient;
public partial class shopcart : System.Web.UI.Page
{
Hashtable ht;
DataTable dt;
string connstr = "Data Source=.\\SQLEXPRESS;AttachDbFilename=F:
\\test.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
SqlConnection conn;
SqlCommand cmd;
SqlDataReader sdr;
protected void Page_Load(object sender, EventArgs e)
{
dt = new DataTable();
DataColumn col = new DataColumn();
col.ColumnName = "id";
col.DataType = System.Type.GetType("System.String");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName = "name";
col.DataType = System.Type.GetType("System.String");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName = "Num";
col.DataType = System.Type.GetType("System.Int32");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName = "price";
col.DataType = System.Type.GetType("System.Single");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName = "Total";
col.DataType = System.Type.GetType("System.Single");
dt.Columns.Add(col);
if (!IsPostBack)
{
Bind();
}
}
public void Bind()
{
if (Session["shopcar"] == null)
{
Response.Write("script>if(confirm('你沒有登錄')window.location='Default.aspx';else window.close();/script>");
}
else
{
ht = (Hashtable)Session["shopcar"];
foreach (object item in ht.Keys)
{
string id = item.ToString();
int num = int.Parse((ht[item].ToString()));
string sql = "select book_name,price from book_info where book_id='" + id + "'";
conn = new SqlConnection(connstr);
cmd = new SqlCommand(sql, conn);
conn.Open();
sdr = cmd.ExecuteReader();
if (sdr.HasRows)
{
sdr.Read();
DataRow row = dt.NewRow();
row["id"] = id;
row["Num"] = num;
row["name"] = sdr.GetString(0);
row["price"] = float.Parse(sdr[1].ToString());
row["total"] = num * (float.Parse(sdr[1].ToString()));
dt.Rows.Add(row);
}
sdr.Close();
conn.Close();
}
}
GridView1.DataSource = dt.DefaultView;
GridView1.DataBind();
}
protected void textbox1_TextChanged(object sender, EventArgs e)
{
Hashtable ht = (Hashtable)Session["shopcar"];
if (ht == null) return;
for (int i = 0; i GridView1.Rows.Count; i++)
{
string id = GridView1.Rows[i].Cells[0].Text.ToString();
Response.Write(id);
string num = ((TextBox)GridView1.Rows[i].FindControl("textbox1")).Text;
Response.Write(" " + num + "br />");
ht[id] = num;
}
Session["shopcar"] = ht;
Bind();
}
protected void button1_Click(object sender, EventArgs e)
{
string id = ((Button)sender).CommandArgument;
Hashtable ht = (Hashtable)Session["shopcar"];
if (ht == null) return;
ht.Remove(id);
Bind();
}
}
制作一個簡單的購物車就是這么簡單,大家可以按照我的思路進行創作,在此基礎上在添加一些功能。
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持腳本之家。
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