抽象工厂模式

 1     interface AbstractFactory
 2     {
 3         //假设就生产刀
 4         ProductDaoBase CreateDao();
 5     }
 6 
 7     class FactoryA : AbstractFactory
 8     {
 9         public ProductDaoBase CreateDao()
10         {
11             return new ProductA();
12         }
13     }
14     class FactoryB : AbstractFactory
15     {
16 
17         public ProductDaoBase CreateDao()
18         {
19             return new ProductB();
20         }
21     }
22     abstract class ProductDaoBase
23     {
24         public string Name { get; set; }
25         public abstract void Show();
26 
27     }
28     class ProductA : ProductDaoBase
29     {
30         public override void Show()
31         {
32             Console.WriteLine("ProductA的Show()方法");
33         }
34     }
35     class ProductB : ProductDaoBase
36     {
37         public override void Show()
38         {
39             Console.WriteLine("ProductB的Show()方法");
40         }
41     }

1 <?xml version="1.0" encoding="utf-8" ?>
2 <configuration>
3     <startup> 
4         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
5     </startup>
6   <appSettings>
7     <add key="CurrentFactory" value="ConsoleApplication.FactoryA"/>
8   </appSettings>
9 </configuration>

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 using System.Configuration;
 7 
 8 namespace ConsoleApplication
 9 {
10     class Program
11     {
12         static void Main(string[] args)
13         {
14             string currentFactory = ConfigurationManager.AppSettings["currentFactory"].ToString();
15             Type type = Type.GetType(currentFactory);
16             if (type != null)
17             {
18                 object obj = Activator.CreateInstance(type);
19                 // ProductDaoBase productBase = (ProductDaoBase)obj;
20                 AbstractFactory af = (AbstractFactory)obj;
21                 ProductDaoBase productBase = af.CreateDao();
22                 productBase.Show();
23 
24 
25             }
26             else
27             {
28                 Console.WriteLine("配置或者读取配置得type有问题");
29             }
30 
31         }
32     }
33 }