【设计模式】抽象工厂模式

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一、定义：

抽象工厂模式：提供一个创建一系列相关或相互依赖对象的接口，而无需指定它们具体的类。

二、结构图：

三、代码实现：

IDepartment接口，用于客户端访问，接触与具体数据库访问的耦合：

interface IDepartment    {        void Insert(Department department);        Department GetDepartment(int id);    }

SqlserverDepartment类，用于访问SQL Server的Department。

class SqlserverDepartment:IDepartment    {        public void Insert(Department department)        {            Console.WriteLine("在 SQL Server 中给 Department 表增加一条记录");        }        public Department GetDepartment(int id)        {            Console.WriteLine("在 SQL Server 中给 Department 表增加一条记录");            return null;        }    }

AccessDepartment类，用于访问Access的Department。

class AccessDepartment:IDepartment    {        public void Insert(Department department)        {            Console.WriteLine("在Access中给Department表增加一条记录");        }        public Department GetDepartment(int id)        {            Console.WriteLine("在Access中根据ID得到Department表一条记录");            return null;        }    }

IFactory接口，定义一个创建访问Department表对象的抽象的工厂接口。

interface IFactory    {        IUser CreateUser();        IDepartment CreateDepartment();    }

SqlServerFactory类，实现IFactory接口，实例化SqlserverUser和SqlserverDepartment。

class SqlServerFactory:IFactory    {        public IUser CreateUser()         {            return new SqlserverUser();        }        public IDepartment CreateDepartment()        {            return new SqlserverDepartment();        }    }

AccessFactory类，实现IFactory接口，实例化AccessUser和AccessDepartment。

class AccessFactory:IFactory    {        public IUser CreateUser()        {            return new AccessUser();        }        public IDepartment CreateDepartment()        {            return new AccessDepartment();        }    }

客户端代码

static void Main(string[] args)        {            User user = new User();            Department dept = new Department();            //IFactory factory = new SqlServerFactory();            //IFactory factory = new AccessFactory();            IFactory factory = new AccessFactory();            IUser iu = factory.CreateUser();            iu.Insert(user);            iu.GetUser(1);            IDepartment id = factory.CreateDepartment();            id.Insert(dept);            id.GetDepartment(1);            Console.Read();        }

结果显示如下：

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