抽象工厂模式特点:
- 围绕一个超级工厂创建其他工厂,该超级工厂又称为其他工厂的工厂。
- 抽象工厂模式是相较工厂模式而言的,对工厂模式更深的抽象,更高内聚,更低耦合
使用场景:
- 与工厂模式相同 ,只是出现了工厂的工厂
工厂模式VS抽象工厂模式
如果说工厂模式是线那么抽象工厂就是面,如果说工厂模式是面那么抽象工厂就是体,抽象工厂的存在就是比工厂模式高一个维度
实现:
namespace 抽象工厂模式 { class Program { static void Main(string[] args) { User user = new User(); Department dept = new Department(); IUser iu = DataAccess.CreateUser(); iu.Insert(user); iu.GetUser(1); IDepartment id = DataAccess.CreateDepartment(); id.Insert(dept); id.GetDepartment(1); Console.Read(); } } class User { private int _id; public int ID { get { return _id; } set { _id = value; } } private string _name; public string Name { get { return _name; } set { _name = value; } } } class Department { private int _id; public int ID { get { return _id; } set { _id = value; } } private string _deptName; public string DeptName { get { return _deptName; } set { _deptName = value; } } } interface IUser { void Insert(User user); User GetUser(int id); } class SqlserverUser : IUser { public void Insert(User user) { Console.WriteLine("在Sqlserver中给User表增加一条记录"); } public User GetUser(int id) { Console.WriteLine("在Sqlserver中根据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表增加一条记录"); } 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 SqlserverDepartment : IDepartment { public void Insert(Department department) { Console.WriteLine("在Sqlserver中给Department表增加一条记录"); } public Department GetDepartment(int id) { Console.WriteLine("在Sqlserver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; } } class DataAccess { private static readonly string AssemblyName = "抽象工厂模式"; private static readonly string db = ConfigurationManager.AppSettings["DB"]; public static IUser CreateUser() { string className = AssemblyName + "." + db + "User"; return (IUser)Assembly.Load(AssemblyName).CreateInstance(className); } public static IDepartment CreateDepartment() { string className = AssemblyName + "." + db + "Department"; return (IDepartment)Assembly.Load(AssemblyName).CreateInstance(className); } } }
配置文件中:
<?xml version="1.0" encoding="utf-8" ?> <configuration> <appSettings> <add key="DB" value="Sqlserver"/> </appSettings> </configuration>
本例中把具体使用哪个数据库抽象到了配置文件中,属于抽象工厂模式的最高级应用场景。
运行结果:
DB为Sqlserver时
DB为Access时