shoppingcart.cs

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using System;
using System.Collections;


[Serializable]
public class ShoppingCart
{
    public Hashtable _CartItems = new Hashtable();

    //购物篮中子项集合
    public ICollection CartItems
    {
        get { return _CartItems.Values; }
    }

    // 购物篮中物品的总金额
    public decimal Total
    {
        get
        {
            decimal sum = 0;
            foreach (CartItem item in _CartItems.Values)
                sum += item.Price * item.Quantity;
            return sum;
        }
    }

    // 在购物篮对象中增加一个子项
    public void AddItem(int ID, string Name, decimal Price)
    {
        CartItem item = (CartItem)_CartItems[ID];
        if (item == null)
            _CartItems.Add(ID, new CartItem(ID, Name, Price));
        else
        {
            item.Quantity++;
            _CartItems[ID] = item;
        }
    }

    // 在购物篮对象中删除一个子项
    public void RemoveItem(int ID)
    {
        CartItem item = (CartItem)_CartItems[ID];
        if (item == null)
            return;
        item.Quantity--;
        if (item.Quantity == 0)
            _CartItems.Remove(ID);
        else
            _CartItems[ID] = item;
    }
}

[Serializable]
public class CartItem
{
    private int _ID;
    private string _Name;
    private decimal _Price;
    private int _Quantity = 1;

    public int ID
    {
        get { return _ID; }
    }

    public string Name
    {
        get { return _Name; }
    }

    public decimal Price
    {
        get { return _Price; }
    }

    public int Quantity
    {
        get { return _Quantity; }
        set { _Quantity = value; }
    }

    public CartItem(int ID, string Name, decimal Price)
    {
        _ID = ID;
        _Name = Name;
        _Price = Price;
    }
}