【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

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

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

   ShopCartItem.cs

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

   ShopCartSet.cs

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

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