【经典示例分享】— 商城购物车设计（VS+Access）附源码

弹指一挥间，从事开发工作两年多了，工作记录文件夹不知不觉好几G了。今天分享下之前项目中用到的一个购物车示例，虽然用的技术比较老（拖放控件DataGview），我觉得里面包含了很多可以细细咀嚼的面向对象思想，尤其是商品和购物车各个对象的从属关系。购物车老生常谈的东西，希望能起到抛砖引玉的效果。下面就简单介绍下吧！(via:女孩礼物网)

此款短小精悍的购物车主要有三大功能：1.折扣方案调整 2.商品列表 3.购物车

1. 折扣方案调整
   

   

2. 商品列表
   

   

3. 购物车
   

   

4. 购物车核心思想代码如下
   
   Product.cs

    1 using System;
    2 using System.Collections.Generic;
    3 
    4 [Serializable]
    5 public class Product {
    6 
    7     int id;
    8 
    9     public int Id {
   10         get { return id; }
   11         set { id = value; }
   12     }
   13 
   14     string name;
   15 
   16     public string Name {
   17         get { return name; }
   18         set { name = value; }
   19     }
   20 
   21     decimal price;
   22 
   23     public decimal Price {
   24         get { return price; }
   25         set { price = value; }
   26     }
   27 
   28     string unit;
   29 
   30     public string Unit {
   31         get { return unit; }
   32         set { unit = value; }
   33     }
   34 
   35     public Product(int id, string name, decimal price, string unit) {
   36         this.id = id;
   37         this.name = name;
   38         this.price = price;
   39         this.unit = unit;
   40     }
   41 }

   ShopCartItem.cs

    1 using System;
    2 using System.Collections.Generic;
    3 using System.Linq;
    4 using System.Web;
    5 
    6 [Serializable]
    7 public class ShopCartItem {
    8 
    9     private Product product;
   10     private int count;
   11 
   12     public Product Product {
   13         get { return product; }
   14         set { product = value; }
   15     }
   16     public int Count {
   17         get { return count; }
   18         set { count = value; }
   19     }
   20 
   21     /// <summary>
   22     /// 单项总折后价。
   23     /// </summary>
   24     public decimal Price {
   25         get {
   26             decimal price = (decimal)0;
   27             List<IDiscountable> discountsUsing = (List<IDiscountable>)HttpContext.Current.Application["DiscountsUsing"];
   28             price = this.TotalPrice;
   29             foreach (IDiscountable discount in discountsUsing) {
   30                 price = price * (decimal)discount.GetDiscount(this.product.Price, this.count);
   31             }
   32             return price;
   33         }
   34     }
   35 
   36     /// <summary>
   37     /// 单项总原价
   38     /// </summary>
   39     public decimal TotalPrice {
   40         get{
   41             return this.product.Price * this.count;
   42         }
   43     }
   44 
   45     public ShopCartItem(Product product, int count) {
   46         this.product = product;
   47         this.count = count;
   48     }
   49 }

   ShopCartSet.cs

    1 using System;
    2 using System.Collections.Generic;
    3 using System.Linq;
    4 using System.Web;
    5 
    6 [Serializable]
    7 public class ShopCartSet : IEnumerable<ShopCartItem> {
    8 
    9     private Dictionary<int, ShopCartItem> items;
   10 
   11     public ShopCartSet() {
   12         this.items = new Dictionary<int, ShopCartItem>();
   13     }
   14 
   15     /// <summary>
   16     /// 各项总原价
   17     /// </summary>
   18     public decimal TotalPrice {
   19         get {
   20             decimal price = (decimal)0;
   21             foreach (ShopCartItem item in this) {
   22                 price = price + item.TotalPrice;
   23             }
   24             return price;
   25         }
   26     }
   27 
   28     /// <summary>
   29     /// 各项总折后价
   30     /// </summary>
   31     public decimal Price {
   32         get {
   33             decimal price = (decimal)0;
   34             foreach (ShopCartItem item in this) {
   35                 price = price + item.Price;
   36             }
   37             return price;
   38         }
   39     }
   40 
   41     public ShopCartItem this[int id] {
   42         get {
   43             return this.items[id];
   44         }
   45         set {
   46             this.items[id] = value;
   47         }
   48     }
   49 
   50     public void Add(Product product, int count) {
   51         this.Add(new ShopCartItem(product, count));
   52     }
   53 
   54     public void Add(ShopCartItem item) {
   55         if (!this.items.ContainsKey(item.Product.Id)) {
   56             this.items.Add(item.Product.Id, item);
   57         }
   58         else {
   59             this.items[item.Product.Id].Count++;
   60         }
   61     }
   62 
   63     public void Remove(int key) {
   64         this.items.Remove(key);
   65     }
   66 
   67     public void Remove(Product product) {
   68         this.items.Remove(product.Id);
   69     }
   70 
   71     public void Remove(ShopCartItem shopCartItem) {
   72         this.items.Remove(shopCartItem.Product.Id);
   73     }
   74 
   75     #region 接口实现
   76     public IEnumerator<ShopCartItem> GetEnumerator() {
   77         return this.items.Values.GetEnumerator();
   78     }
   79 
   80     System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
   81         return this.items.Values.GetEnumerator();
   82     }
   83     #endregion
   84 }

    

    

   
   
   

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