book.aspx.vb

编程之道VB.NETt程序设计入门-589M.zip

Imports Nozama.BusinessLogic
Imports Nozama.DataAccess
Imports Nozama.General

Public Class Book
    Inherits System.Web.UI.Page
    Protected WithEvents BookImage As System.Web.UI.WebControls.Image
    Protected WithEvents Author As System.Web.UI.WebControls.Label
    Protected WithEvents AddToCart As System.Web.UI.WebControls.Button
    Protected WithEvents BookSubject As System.Web.UI.WebControls.Label
    Protected WithEvents BookName As System.Web.UI.WebControls.Label
    Protected WithEvents BookPrice As System.Web.UI.WebControls.Label

#Region " Web 窗体设计器生成的代码 "

    '该调用是 Web 窗体设计器所必需的。
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

    End Sub

    Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
        'CODEGEN: 此方法调用是 Web 窗体设计器所必需的
        '不要使用代码编辑器修改它。
        InitializeComponent()
    End Sub

#End Region

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        '在此处放置初始化页的用户代码

        Dim blBook As New BookLogic()
        Dim books As BookData

        books = blBook.GetBooksByID(Request.QueryString("BookID"))
        With books.Tables(BookData.BOOKS_TABLE).Rows(0)
            BookImage.ImageUrl = "images/" & .Item(BookData.IMAGE_FILE)
            BookName.Text = .Item(BookData.NAME)
            BookPrice.Text = .Item(BookData.PRICE)
            BookSubject.Text = .Item(BookData.SUBJECT)
            Author.Text = .Item(BookData.AUTHORS)

            AddToCart.CommandArgument = Request.QueryString("BookID") & "|" & .Item(BookData.PRICE) & "|" & .Item(BookData.NAME)
        End With
    End Sub


    Private Sub AddToCart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AddToCart.Click
        Dim itemButton As Button = CType(sender, Button)
        Dim arguments As String = itemButton.CommandArgument
        Dim parseChar() As Char = {CChar("|")}
        Dim addArgs() As String = arguments.Split(parseChar)

        GetShoppingCart().AddBook(Int32.Parse(addArgs(0)), Decimal.Parse(addArgs(1)), addArgs(2))
        Response.Redirect("ShoppingCart.aspx")
    End Sub

    Private Function GetShoppingCart() As Cart
        Dim cart As Cart = CType(Session().Item(Settings.ShoppingCart), Cart)

        If cart Is Nothing Then
            cart = New Cart()
            Session().Item(Settings.ShoppingCart) = cart
        End If
        Return cart

    End Function
End Class