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步步为营 .NET 代码重构学习笔记 九

一、Duplicate Observed Data(复制[被监视数据])

动机(Motivation)

将该笔数据拷贝到一个domain object中。建立一个Observer模式,用以对domain object 和GUI object内的重复数据进行同步控制(sync)。

示例

html">步步为营 .NET 设计模式学习笔记 十二、Observer (观察者模式) 

二、Change Unidirectional Association to Bidirectional(将单向关联改为双向)

动机(Motivation)

添加一个反指针,并使修改函数(modifiers)能够同时更新两条连接。

示例

    public class Order
    {
        private Customer _customer;

        public Customer NewCustomer
        {
            get { return _customer; }
            set { _customer = value; }
        }
    }

    public class Customer
    {
    }

改为

   public class Order
    {
        public List<Customer> CustomerList = new List<Customer>();

        public void AddCustomer(Customer arg)
        {
            arg.orderlist.Add(this);
            CustomerList.Add(arg);
        }

        public void RemoveCustomer(Customer arg)
        {
            arg.orderlist.Remove(this);
            CustomerList.Remove(arg);
        }
    }

    public class Customer
    {
        public List<Order> orderlist = new List<Order>();
        public void AddOrder(Order arg)
        {
            arg.CustomerList.Add(this);
            orderlist.Add(arg);
        }
        public void RemoveOrder(Order arg)
        {
            arg.CustomerList.Remove(this);
            orderlist.Remove(arg);
        }
    }

 

三、Change Bidirectional Association to Unidirectional(将双向改为单向)

动机(Motivation)

两个classes之间有双向关联,但其中一个class如今不再需要另一个class的特性。

示例

public class Order
    {
        public List<Customer> CustomerList = new List<Customer>();

        public void AddCustomer(Customer arg)
        {
            arg.orderlist.Add(this);
            CustomerList.Add(arg);
        }

        public void RemoveCustomer(Customer arg)
        {
            arg.orderlist.Remove(this);
            CustomerList.Remove(arg);
        }
    }

    public class Customer
    {
        public List<Order> orderlist = new List<Order>();
        public void AddOrder(Order arg)
        {
            arg.CustomerList.Add(this);
            orderlist.Add(arg);
        }
        public void RemoveOrder(Order arg)
        {
            arg.CustomerList.Remove(this);
            orderlist.Remove(arg);
        }
    }

 

改为

    public class Order
    {
        private Customer _customer;

        public Customer NewCustomer
        {
            get { return _customer; }
            set { _customer = value; }
        }
    }

    public class Customer
    {
    }

 

四、Replace Magic Number with Symbolic Constant(以符号常量/字面常量取侙魔法数)

动机(Motivation)

创造一个常量,根据其意义为它命名,并将上述的字面数值替换为这个常量。

示例

        public double PotentialEnergy(double mass, double height)
        {
            return mass * 9.51 * height;
        }

 

改为

        private double GRAVITATIONAL_CONSTANT = 9.51;
        public double PotentialEnergy(double mass, double height)
        {
            return mass * GRAVITATIONAL_CONSTANT * height;
        }

 

 

五、Encapsulate Field(封装值域)

动机(Motivation)

将它声明为private,并提供相应的访问函数(accessors)

示例

public string _name;

 

改为

        private  string _name;

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

 

六、Replace Type Code with Class(以类取代型别码)

动机(Motivation)

以一个新的class替换该数值型别码(type code)

示例

    public class Person
    {
        public  int O = 0;
        public  int A = 1;
        public  int B = 2;
   &n

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