抽象工厂方法

interface IUser
    {
        void Insert(User user);
        User GetUser(int id);
    }

    class User
    {
        private int _id;
        private string _name;

        public int ID
        {
            get { return _id; }
            set { _id = value; }
        }

        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }
    }

    class SqlServerUser : IUser
    {
        public void Insert(User user)
        {
            Console.WriteLine("在SQL Server中给User表增加一条记录");
        }

        public User GetUser(int id)
        {
            Console.WriteLine("在SQL Server中更加ID得到User表一条记录");
            return null;
        }
    }

    class AccessUser : IUser
    {
        public void Insert(User user)
        {
            Console.WriteLine("在Access中给User表添加一条记录");
        }

        public User GetUser(int id)
        {
            Console.WriteLine("在Access中根据ID得到User表一条记录");
            return null;
        }
    }

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

    class Department
    {
        private int _id;
        private string _name;

        public int ID
        {
            get { return _id; }
            set { _id = value; }
        }

        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }
    }

    class SqlServerDepartment : IDepartment
    {
        public void Insert(Department department)
        {
            Console.WriteLine("在SQL Server中给Department表添加一条记录");
        }

        public Department GetDepartment(int id)
        {
            Console.WriteLine("在SQL Server中根据ID得到Department表一条记录");

            return null;
        }
    }

    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;
        }
    }

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

    class SqlServerFactory : IFactory
    {
        public IUser CreateUser()
        {
            return new SqlServerUser();
        }

        public IDepartment CreateDepartment()
        {
            return new SqlServerDepartment();
        }
    }

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

        public IDepartment CreateDepartment()
        {
            return new AccessDepartment();
        }
    }

 转自《大话设计模式》