[Classic example sharing]-Mall Shopping Cart design (VS + Access) with source code

I have been engaged in development work for more than two years, and the work record folder is several GB without knowing it. Today, I will share an example of a shopping cart used in the previous project. Although the technology used is relatively old (drag-and-drop control lateral view), I think it contains a lot of object-oriented ideas that can be chewed carefully, in particular, the subordination between products and shopping cart objects. Purchase

I have been engaged in development work for more than two years, and the work record folder is several GB without knowing it. Today, I will share an example of a shopping cart used in the previous project. Although the technology used is relatively old (drag-and-drop control lateral view), I think it contains a lot of object-oriented ideas that can be chewed carefully, in particular, the subordination between products and shopping cart objects. Purchase

I have been engaged in development work for more than two years, and the work record folder is several GB without knowing it. Today, I will share an example of a shopping cart used in the previous project. Although the technology used is relatively old (drag-and-drop control lateral view), I think it contains a lot of object-oriented ideas that can be chewed carefully, in particular, the subordination between products and shopping cart objects. The shopping cart is an old and common topic, hoping to make a good result. The following is a brief introduction! (Via: Girl gift Network)

This short and concise shopping cart has three main functions: 1. Adjust the discount scheme 2. Commodity List 3. Shopping Cart

1. Discount Scheme Adjustment
   

2. Item List
   

3. Shopping Cart
   

4. The core idea code of shopping cart is as follows:
   

   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 {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 // The total discount price for a single item. 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 // total original price of a single item 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
       
        
   Items; 10 11 public ShopCartSet () {12 this. items = new Dictionary
        
         
   (); 13} 14 15 ///
         16 // total original prices of each item 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 // total discount price of each item 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 Ad D (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 interface 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 # endregion84}
         
        
       
      

   
   
   

Source code download