【经典示例分享】— 商城购物车设计（VS+Access）附源码

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 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 }
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 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 }
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 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 }

 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 }