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【经典示例分享】—商城购物车设计(VS+Access)附源码

时间:2021-07-01 10:21:17 帮助过:46人阅读

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

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     /// 
    22     /// 单项总折后价。
    23     /// 
    24     public decimal Price {
    25         get {
    26             decimal price = (decimal)0;
    27             List discountsUsing = (List)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     /// 
    37     /// 单项总原价
    38     /// 
    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 {
     8 
     9     private Dictionary<int, ShopCartItem> items;
    10 
    11     public ShopCartSet() {
    12         this.items = new Dictionary<int, ShopCartItem>();
    13     }
    14 
    15     /// 
    16     /// 各项总原价
    17     /// 
    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     /// 
    29     /// 各项总折后价
    30     /// 
    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 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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