product.aspx.cs

ASP.NET网络编程从入门到精通书的源代码资料

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class Desktop_Product : System.Web.UI.Page
{
	private int nCategoryID = -1;
	protected void Page_Load(object sender,EventArgs e)
	{	///获取参数的值		
		if(Request.Params["CategoryID"] != null)
		{
			if(Int32.TryParse(Request.Params["CategoryID"].ToString(),out nCategoryID) == false)
			{
				return;
			}
		}
		///绑定控件的数据
		if(!Page.IsPostBack)
		{
			BindCategoryData();
			if(nCategoryID > 0)
			{
				BindProductData(nCategoryID);
			}
			else
			{
				BindProductData(1);
			}
		}
	}   

	private void BindCategoryData()
	{	///定义获取数据的类
		Category category = new Category();
		SqlDataReader drc = category.GetSubCategorys(1);
		///设定控件的数据源
		ProductList.DataSource = drc;
		///绑定控件的数据
		ProductList.DataBind();
		///关闭数据读取器和数据库的连接
		drc.Close();
	}
	private void BindProductData(int nCategoryID)
	{
		///定义获取数据的类
		Product product = new Product();
		SqlDataReader dr = product.GetProductByCategory(nCategoryID);

		///设定控件的数据源
		ProductView.DataSource = dr;
		///绑定控件的数据
		ProductView.DataBind();

		///关闭数据读取器和数据库的连接
		dr.Close();
	}
	protected void ProductView_RowCommand(object sender,GridViewCommandEventArgs e)
	{
		OrderItemInfo item = null;
		OrderInfo order = null;

		///添加到购物车中，购物车的数据使用Session保存
		if(Session[Session.SessionID + OrderForm.Cart] == null)
		{
			///当购物车没有任何信息时
			item = GetOrderItemInformation(e);
			if(item == null)
			{
				///显示错误信息					
				Response.Write("<script>window.alert('数据错误')</script>");
				return;
			}

			///创建订单信息               
			order = new OrderInfo();
			order.OrderItemList.Add(item);
			order.TotalMoney = item.Price;
			order.TotalNumber = item.Number;

			///添加订单信息到Session中
			Session[Session.SessionID + OrderForm.Cart] = order;
		}
		else
		{
			///当购物车中已经存在商品信息时，从Session中获取以前的商品信息
			order = (OrderInfo)Session[Session.SessionID + OrderForm.Cart];
			item = GetOrderItemInformation(e);
			if(item == null)
			{
				///显示错误信息
				Response.Write("<script>window.alert('数据错误')</script>");
				return;
			}

			///判断是否已经添加该类型的商品
			int i = 0;
			for(i = 0; i < order.OrderItemList.Count; i++)
			{
				///如果添加了，则数量加一
				if(item.ProductID == ((OrderItemInfo)order.OrderItemList[i]).ProductID)
				{
					((OrderItemInfo)order.OrderItemList[i]).Number++;
					((OrderItemInfo)order.OrderItemList[i]).ItemTotalMoney += item.ItemTotalMoney;
					break;
				}
			}
			///否则添加新的商品
			if(i == order.OrderItemList.Count)
			{
				order.OrderItemList.Add(item);
			}
			///更新订单信息
			order.TotalNumber++;
			order.TotalMoney += item.Price;
			Session[Session.SessionID + OrderForm.Cart] = order;
		}
		Response.Write("<script>window.alert('恭喜您，添加该商品到购物车成功！')</script>");
	}

	private OrderItemInfo GetOrderItemInformation(GridViewCommandEventArgs e)
	{
		///当购物车没有任何信息时
		OrderItemInfo item = new OrderItemInfo();
		item.Date = DateTime.Now;
		item.Number = 1;		

		///获取商品价格
		Label priceL = (Label)ProductView.Rows[
			Int32.Parse(e.CommandArgument.ToString())].FindControl("Price");
		if(priceL == null)
		{
			///显示错误信息
			Response.Write("<script>window.alert('数据错误')</script>");
			return null;
		}		
		item.Price = item.ItemTotalMoney = decimal.Parse(priceL.Text.Trim());
		///获取商品ID
		item.ProductID = Int32.Parse(ProductView.DataKeys[
			Int32.Parse(e.CommandArgument.ToString())].Value.ToString());			
		///获取商品名称
		item.Name = e.CommandName;        
		return (item);
	}
	protected void ProductView_RowCreated(object sender,GridViewRowEventArgs e)
	{		
		if(e.Row.RowType == DataControlRowType.DataRow)
		{
			Button buyBtn = (Button)e.Row.FindControl("BuyBtn");
			if(buyBtn != null)
			{
				buyBtn.CommandArgument = e.Row.RowIndex.ToString();
			}
		}
	}
}