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(); }
购物车代码：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('你没有登录')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(); } }
制作一个简单的购物车就是这么简单，大家可以按照我的思路进行创作，在此基础上在添加一些功能。