This class defines a CartItemList that contains a list of CartItem objects. It allows adding, removing, and retrieving CartItem objects by index or product ID. It also has methods to get the cart item count, clear the entire cart list, and get the cart item list stored in the current HTTP session.

1. Imports Microsoft.VisualBasic
Public Class CartItemList
Private cartItems As List(Of CartItem)
Public Sub New()
cartItems = New List(Of CartItem)
End Sub
Public ReadOnly Property Count As Integer
Get
Return cartItems.Count
End Get
End Property
Default Public Property Item(ByVal index As Integer) As CartItem
Get
Return cartItems(index)
End Get
Set(ByVal value As CartItem)
cartItems(index) = value
End Set
End Property
Default Public ReadOnly Property Item(ByVal id As String) As CartItem
Get
For Each c As CartItem In cartItems
If c.Product.ProductID = id Then
Return c
End If
Next
Return Nothing
End Get
End Property
Public Shared Function GetCart() As CartItemList
If CType(HttpContext.Current.Session("Cart"), CartItemList) Is Nothing Then
HttpContext.Current.Session.Add("Cart", New CartItemList)
End If
Return CType(HttpContext.Current.Session("Cart"), CartItemList)
End Function
Public Sub AddItem(ByVal product As Product, ByVal quantity As Integer)
Dim c As New CartItem(product, quantity)
cartItems.Add(c)
End Sub
Public Sub RemoveAt(ByVal index As Integer)
cartItems.RemoveAt(index)
End Sub
Public Sub Clear()
cartItems.Clear()
End Sub
End Class