本文实例讲述了asp.net基于HashTable实现购物车的方法。分享给大家供大家参考,具体如下:
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//用户购买商品时 if (e.CommandName.ToLower() == "buy" ) { //判断用户购物车是否为空 如果为空则分配一个 Hashtable table; if (Session[ "car" ] == null ) { table = new Hashtable(); } else { //用户购物车己存在 则取出数据 table = Session[ "car" ] as Hashtable; } //如果用户购物车中不包括该商品信息 则添加一个新商品 if (!table.Contains(e.CommandArgument)) { table.Add(e.CommandArgument, 1); //添加一个新商品 数量为1 } else { //如果购物车己存在该商品信息 则将该商品的数量加1 根据HashTable的键获取相对应的值 int count = Convert.ToInt32(table[e.CommandArgument].ToString()); //给该商品数量加上1 table[e.CommandArgument] = (count + 1); } //保存商品信息 Session[ "car" ] = table; Response.Redirect( "shoppingcar.aspx" ); } //商品信息列表 private void shoplist() { Hashtable table; if (Session[ "car" ] == null ) { table = new Hashtable(); } else { table = Session[ "car" ] as Hashtable; } if (table.Count == 0) { Image13.Visible = true ; Msg.Visible = true ; Msg.Text = "<b style=" color:red " mce_style=" color:red ">您还没有购物呢?赶快购物吧!</b>" ; } string [] Arrkey = new string [table.Count]; int [] ArrVal = new int [table.Count]; table.Keys.CopyTo(Arrkey, 0); table.Values.CopyTo(ArrVal, 0); //定义字符串 形成 ('1,2,3') string Products = "('" ; int k = 0; for ( int j = 0; j < Arrkey.Length; j++) { if (k>0)Products += "','" ; k++; Products += Arrkey.GetValue(j).ToString(); } Products += "')" ; DataSet ds = productbll.GetInfoByWhere( " pid in " + Products); DataTable Table1 = new DataTable(); Table1 = ds.Tables[0]; Table1.Columns.Add( new DataColumn( "shuliang" , System.Type.GetType( "System.Int32" ))); //得到pid的值 并将它设置为Table1的主键 DataColumn[] keys = { Table1.Columns[ "pid" ]}; Table1.PrimaryKey = keys; foreach ( string key in table.Keys) { Table1.Rows.Find(key)[ "shuliang" ] = table[key]; //根据键获取值 商品的数量 } Table1.Columns.Add( new DataColumn( "zongjia" , System.Type.GetType( "System.Double" ), "hotprice*shuliang" )); for ( int n = 0; n < Table1.Rows.Count; n++) { tPrice +=Convert.ToDouble(Table1.Rows[n][ "zongjia" ]); } Label1.Text = tPrice.ToString(); Session[ "total" ] = Label1.Text.ToString(); MyGrid.DataSource = Table1.DefaultView; MyGrid.DataBind(); } #region 从购物车中删除一条商品信息 protected void MyGrid_RowCommand( object sender, GridViewCommandEventArgs e) { Hashtable table; if (Session[ "car" ] == null ) { table = new Hashtable(); } else { table = Session[ "car" ] as Hashtable; } //如果点击删除按钮 则从购物车中移除该商品信息 if (e.CommandName.ToLower() == "delete" ) { if (table.ContainsKey(e.CommandArgument)) { //从HashTable中移除该商品的信息(商品编号) 键:为商品编号 值为:商品数量 table.Remove(e.CommandArgument); } Msg.Text = ( string )e.CommandArgument; } Session[ "car" ] = table; //调用方法 shoplist(); } #endregion |
希望本文所述对大家asp.net程序设计有所帮助。