browserbook.aspx.cs

精通网络应用系统开发 光盘 该书是人民邮电出版社出版的

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;
using System.Linq;
using System.Data.Linq;
using System.Collections.Generic;

public partial class DesktopModules_Book_BrowserBook : System.Web.UI.Page
{
    protected int nCategoryID = -1;

    protected void Page_Load(object sender, EventArgs e)
    {
        if(Request.Params["CategoryID"] != null)
        {
            nCategoryID = Int32.Parse(Request.Params["CategoryID"].ToString());
        }
        if (!Page.IsPostBack)
        {
            if (nCategoryID > -1)
            {
                ///按照书籍种类显示所有书籍
                BindBookData(nCategoryID);
            }
        }
    }

    private void BindBookData(int nCategoryID)
    {
        BookM book = new BookM();
        IList<Book> recb = book.GetBookByCategory(nCategoryID);
		if(recb == null) return;
        gvBook.DataSource = recb;
		gvBook.DataBind();
        //Book bok = new Book();
        //bok.;
    }

    private OrderItemInformation GetOrderItemInformation(GridViewCommandEventArgs e)
    {
        ///当购物车没有任何信息时
        OrderItemInformation item = new OrderItemInformation();
        item.BookID = Int32.Parse(gvBook.DataKeys[Int32.Parse(e.CommandArgument.ToString())]["BookID"].ToString());
        item.ItemDate = DateTime.Now;
        item.Number = 1;

        ///获取书籍价格
        Label priceL = (Label)gvBook.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 = decimal.Parse(priceL.Text.Trim());

		item.Name = gvBook.DataKeys[Int32.Parse(e.CommandArgument.ToString())]["Name"].ToString();
        item.Desn = gvBook.DataKeys[Int32.Parse(e.CommandArgument.ToString())]["Desn"].ToString();
		return (item);
    }
	protected void gvBook_RowCommand(object sender,GridViewCommandEventArgs e)
	{
		if(e.CommandName.ToLower() == "add")
		{
			OrderItemInformation item = null;
			OrderFormInformation order = null;

			///添加到购物车中，购物车的数据使用Session保存
			if(Session[Session.SessionID + ASPNET35System.ShoppingCart] == 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 OrderFormInformation();
				order.OrderItemList.Add(item);
				order.TotalMoney = item.Price;
				order.TotalNumber = item.Number;

				///添加订单信息到Session中
				Session[Session.SessionID + ASPNET35System.ShoppingCart] = order;
			}
			else
			{
				///当购物车中已经存在书籍信息时，从Session中获取以前的书籍信息
				order = (OrderFormInformation)Session[Session.SessionID + ASPNET35System.ShoppingCart];
				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书籍
				int i = 0;
				for(i = 0; i < order.OrderItemList.Count; i++)
				{
					///如果添加了，则数量加一
					if(item.BookID == ((OrderItemInformation)order.OrderItemList[i]).BookID)
					{
						((OrderItemInformation)order.OrderItemList[i]).Number++;
						break;
					}
				}
				///否则添加新的书籍
				if(i == order.OrderItemList.Count)
				{
					order.OrderItemList.Add(item);
				}
				///更新订单信息
				order.TotalNumber++;
				order.TotalMoney += item.Price;
				Session[Session.SessionID + ASPNET35System.ShoppingCart] = order;
			}
			Response.Write("<script>window.alert('恭喜您，添加该书籍到购物车成功！')</script>");
		}
	}

	protected void gvBook_RowCreated(object sender,GridViewRowEventArgs e)
	{
		if(e.Row.RowType == DataControlRowType.DataRow)
		{
			Button BuyBook = (Button)e.Row.FindControl("BuyBook");
			if(BuyBook != null)
			{
				BuyBook.CommandArgument = e.Row.RowIndex.ToString();
			}
		}
	}
}