shoppingcart.aspx.cs

手机网店源码

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace MobileOnlineShop
{
	/// <summary>
	/// ShoppingCart 的摘要说明。
	/// </summary>
	public class ShoppingCart : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DataGrid MyList;
		protected System.Web.UI.WebControls.Label lblTotal;
		protected System.Web.UI.WebControls.ImageButton UpdateBtn;
		protected System.Web.UI.WebControls.ImageButton ImageButton1;
		protected System.Web.UI.WebControls.Panel DetailsPanel;
		protected System.Web.UI.HtmlControls.HtmlTable Table1;
		protected System.Web.UI.HtmlControls.HtmlTable Table4;
		protected System.Web.UI.WebControls.Label MyError;
		protected System.Web.UI.HtmlControls.HtmlForm Form1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			if(this.IsPostBack == false)
			{
				ShowShoppingCartList();
			}
		}
		
		#region Web 窗体设计器生成的代码
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.UpdateBtn.Click += new System.Web.UI.ImageClickEventHandler(this.UpdateBtn_Click);
			this.ImageButton1.Click += new System.Web.UI.ImageClickEventHandler(this.ImageButton1_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void UpdateBtn_Click(object sender, System.Web.UI.ImageClickEventArgs e)
		{
			UpdateShoppingCartDatabase();
			ShowShoppingCartList();
		}

		private void ImageButton1_Click(object sender, System.Web.UI.ImageClickEventArgs e)
		{
			//先更新ShoppingCart表
			UpdateShoppingCartDatabase();

			//实例化购物车模块数据访问类ShoppingCartDB为对象cart
			MobileOnlineShop.DAL.ShoppingCartDB cart = new MobileOnlineShop.DAL.ShoppingCartDB();

			//
			string cartID=cart.GetShoppingCartID();

			//
			if(cart.GetItemCount(cartID) !=0)
			{
				//
				Response.Redirect("Checkout.aspx");
			}
			else
			{
				//
				this.MyError.Text="购物车为空不能进入结算中心页面";
			}
		
		}
		/// <summary>
		/// ShowShoppingCartList()显示客户购物车商品信息
		/// </summary>
		void ShowShoppingCartList()
		{
			//实例化购物车模块数据访问类ShoppingCartDB为对象cart
			MobileOnlineShop.DAL.ShoppingCartDB cart=new MobileOnlineShop.DAL.ShoppingCartDB();

			//获取当前用户的购物车ID
			string cartID=cart.GetShoppingCartID();
//			string cartID="1";

			//如果此用户的购物车内没有商品,就隐藏购物车商品列表,并显示相关信息
			if(cart.GetItemCount(cartID) ==0)
			{
				
				this.DetailsPanel.Visible=false;
				this.MyError.Text="您的购物车内没有商品";
			}
			else
			{
				//指定DataGrid的数据源并绑定
				this.MyList.DataSource = cart.GetItems(cartID);
				this.MyList.DataBind();

				//获取并显示购物车内商品的总额
				this.lblTotal.Text = String.Format("{0:c}",cart.GetTotal(cartID));
			}
		}
		/// <summary>
		/// UpdateShoppingCartDatabase()更新当前购物车内详细购物信息
		/// </summary>
		void UpdateShoppingCartDatabase() 
		{
			//实例化购物车模块数据访问类ShoppingCartDB为对象cart
			MobileOnlineShop.DAL.ShoppingCartDB cart=new MobileOnlineShop.DAL.ShoppingCartDB();

			// 获取当前用户的购物车标识
			String cartId = cart.GetShoppingCartID();
//			cartId="1";

			// 遍历购物车列表中的每一条购物信息
			for (int i=0; i < MyList.Items.Count; i++) 
			{

				// 获取当前行的数据控件
				TextBox quantityTxt = (TextBox) MyList.Items[i].FindControl("Quantity");
				CheckBox remove = (CheckBox) MyList.Items[i].FindControl("Remove");

				// 使用try/catch块来捕捉可能出现的错误
				// 定义int型变量quantity
				int quantity;
				try 
				{
					quantity = Int32.Parse(quantityTxt.Text);

					// 判断订购商品数量是否更改和remove是否有效
					if (quantity != (int)MyList.DataKeys[i] || remove.Checked == true) 
					{

						Label lblProductID = (Label) MyList.Items[i].FindControl("ProductID");
						//如果订购数量为0或用户选中了删除此商品，就删除此商品记录
						if (quantity == 0 || remove.Checked == true) 
						{
							cart.RemoveItem(cartId, Int32.Parse(lblProductID.Text));
						}
						//不然就更新ShoppingCart表
						else 
						{
							cart.UpdateItem(cartId, Int32.Parse(lblProductID.Text),quantity);
						}
					}
				}
				//若捕捉到任何错误就显示异常
				catch 
				{
					MyError.Text = "您的一个或多个输入不正确";
				}
			}
		}

	}
}