抽象工厂模式:
AbstractFactory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。
Demo:
interface IFactory//抽象工厂接口,包含所有产品创建的抽象方法
{
IUser CreateUser();
IAdmin CreateAdmin();
}
class SqlServerFactory : IFactory//具体工厂
{
public IUser CreateUser()
{
return new SqlServerUser();
}
public IAdmin CreateAdmin()
{
return new SqlServerAdmin();
}
}
class AccessFactory : IFactory
{
public IUser CreateUser()
{
return new AccessUser();
}
public IAdmin CreateAdmin()
{
return new AccessAdmin();
}
}
//用于客户端访问,解除与具体数据库访问的耦合
interface IAdmin//抽象产品
{
void Insert(Admin admin);
Admin GetAdmin(int id);
}
class SqlServerAdmin : IAdmin//产品的具体实现
{
public void Insert(Admin admin)
{
Console.WriteLine("在sql数据库中插入admin");
}
public Admin GetAdmin(int id)
{
Console.WriteLine("在Sql中根据ID查询admin");
return null;
}
}
class AccessAdmin : IAdmin
{
public void Insert(Admin admin)
{
Console.WriteLine("在Access中插入admin");
}
public Admin GetAdmin(int id)
{
Console.WriteLine("在Access中根据ID查询Admin");
return null;
}
}
class Program
{
//抽象工厂,结构与ConsoleApp2相同。因为有多个对象(User,admin)所以将对象抽象
static void Main(string[] args)
{
User user = new User();
Admin admin = new Admin();
IFactory factory = new AccessFactory();//选择数据库类型
IUser iu = factory.CreateUser();
iu.Insert(user);
iu.GetUser(1);
IAdmin ia = factory.CreateAdmin();
ia.Insert(admin );
ia.GetAdmin(1);
Console.ReadKey();
}
}