【經典示例分享】— 商城購物車設計（VS+Access）附源碼

彈指一揮間，從事開發工作兩年多了，工作記錄文件夾不知不覺好幾G了。今天分享下之前項目中用到的一個購物車示例，雖然用的技術比較老（拖放控件DataGview），我覺得里面包含了很多可以細細咀嚼的面向對象思想，尤其是商品和購物車各個對象的從屬關系。購物車老生常談的東西，希望能起到拋磚引玉的效果。下面就簡單介紹下吧！(via:女孩禮物網)

此款短小精悍的購物車主要有三大功能：1.折扣方案調整 2.商品列表 3.購物車

1. 折扣方案調整
   

   

2. 商品列表
   

   

3. 購物車
   

   

4. 購物車核心思想代碼如下
   

   using System;
   using System.Collections.Generic;
   
   [Serializable]
   public class Product {
   
       int id;
   
       public int Id {
           get { return id; }
           set { id = value; }
       }
   
       string name;
   
       public string Name {
           get { return name; }
           set { name = value; }
       }
   
       decimal price;
   
       public decimal Price {
           get { return price; }
           set { price = value; }
       }
   
       string unit;
   
       public string Unit {
           get { return unit; }
           set { unit = value; }
       }
   
       public Product(int id, string name, decimal price, string unit) {
           this.id = id;
           this.name = name;
           this.price = price;
           this.unit = unit;
       }
   }

   using System;
   using System.Collections.Generic;
   using System.Linq;
   using System.Web;
   
   [Serializable]
   public class ShopCartItem {
   
       private Product product;
       private int count;
   
       public Product Product {
           get { return product; }
           set { product = value; }
       }
       public int Count {
           get { return count; }
           set { count = value; }
       }
   
       /// <summary>
       /// 單項總折后價。
       /// </summary>
       public decimal Price {
           get {
               decimal price = (decimal)0;
               List<IDiscountable> discountsUsing = (List<IDiscountable>)HttpContext.Current.Application["DiscountsUsing"];
               price = this.TotalPrice;
               foreach (IDiscountable discount in discountsUsing) {
                   price = price * (decimal)discount.GetDiscount(this.product.Price, this.count);
               }
               return price;
           }
       }
   
       /// <summary>
       /// 單項總原價
       /// </summary>
       public decimal TotalPrice {
           get{
               return this.product.Price * this.count;
           }
       }
   
       public ShopCartItem(Product product, int count) {
           this.product = product;
           this.count = count;
       }
   }

   using System;
   using System.Collections.Generic;
   using System.Linq;
   using System.Web;
   
   [Serializable]
   public class ShopCartSet : IEnumerable<ShopCartItem> {
   
       private Dictionary<int, ShopCartItem> items;
   
       public ShopCartSet() {
           this.items = new Dictionary<int, ShopCartItem>();
       }
   
       /// <summary>
       /// 各項總原價
       /// </summary>
       public decimal TotalPrice {
           get {
               decimal price = (decimal)0;
               foreach (ShopCartItem item in this) {
                   price = price + item.TotalPrice;
               }
               return price;
           }
       }
   
       /// <summary>
       /// 各項總折后價
       /// </summary>
       public decimal Price {
           get {
               decimal price = (decimal)0;
               foreach (ShopCartItem item in this) {
                   price = price + item.Price;
               }
               return price;
           }
       }
   
       public ShopCartItem this[int id] {
           get {
               return this.items[id];
           }
           set {
               this.items[id] = value;
           }
       }
   
       public void Add(Product product, int count) {
           this.Add(new ShopCartItem(product, count));
       }
   
       public void Add(ShopCartItem item) {
           if (!this.items.ContainsKey(item.Product.Id)) {
               this.items.Add(item.Product.Id, item);
           }
           else {
               this.items[item.Product.Id].Count++;
           }
       }
   
       public void Remove(int key) {
           this.items.Remove(key);
       }
   
       public void Remove(Product product) {
           this.items.Remove(product.Id);
       }
   
       public void Remove(ShopCartItem shopCartItem) {
           this.items.Remove(shopCartItem.Product.Id);
       }
   
       #region 接口實現
       public IEnumerator<ShopCartItem> GetEnumerator() {
           return this.items.Values.GetEnumerator();
       }
   
       System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
           return this.items.Values.GetEnumerator();
       }
       #endregion
   }

    

    

   
   
   

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