简历复印 原型模式

9.1 夸张的简历

9.2 简历代码的初步实现

namespace 原型模式
{
    class Program
    {
        static void Main(string[] args)
        {
            Resume a = new Resume("大鸟");
            a.SetPersonalInfo("男", "29");
            a.SetWorkExperience("1998-2000", "XX公司");

            Resume b = new Resume("大鸟");
            b.SetPersonalInfo("男", "29");
            b.SetWorkExperience("1998-2000", "XX公司");

            Resume c = new Resume("大鸟");
            c.SetPersonalInfo("男", "29");
            c.SetWorkExperience("1998-2000", "XX公司");

            a.Display();
            b.Display();
            c.Display();

            Console.Read();
        }
    }

    //简历
    class Resume
    {
        private string name;
        private string sex;
        private string age;
        private string timeArea;
        private string company;

        public Resume(string name)
        {
            this.name = name;
        }

        //设置个人信息
        public void SetPersonalInfo(string sex, string age)
        {
            this.sex = sex;
            this.age = age;
        }

        //设置工作经历
        public void SetWorkExperience(string timeArea, string company)
        {
            this.timeArea = timeArea;
            this.company = company;
        }

        //显示
        public void Display()
        {
            Console.WriteLine("{0} {1} {2}", name, sex, age);
            Console.WriteLine("工作经历：{0} {1}", timeArea, company);
        }
    }

}

9.3 原型模式

用原型实例指定创建对象的种类，并且通过拷贝这些原型创建新的对象，

原型模式其实就是从一个对象再创建另外一个可定制的对象，而且不需要知道任何创建的细节，

namespace 原型模式
{
    class Program
    {
        static void Main(string[] args)
        {
            ConcretePrototype1 p1 = new ConcretePrototype1("I");
            ConcretePrototype1 c1 = (ConcretePrototype1)p1.Clone();   //克隆类ConcretePrototype1的实例p1就能得到新的实例c1，
            Console.WriteLine("Cloned: {0}", c1.Id);

            ConcretePrototype2 p2 = new ConcretePrototype2("II");
            ConcretePrototype2 c2 = (ConcretePrototype2)p2.Clone();
            Console.WriteLine("Cloned: {0}", c2.Id);

            Console.Read();

        }
    }

    abstract class Prototype
    {
        private string id;

        // Constructor 
        public Prototype(string id)
        {
            this.id = id;
        }

        // Property 
        public string Id
        {
            get { return id; }
        }

        //抽象类关键就是有这样一个Clone方法，
        public abstract Prototype Clone();
    }

    class ConcretePrototype1 : Prototype
    {
        // Constructor 
        public ConcretePrototype1(string id)
            : base(id)
        {

        }

        public override Prototype Clone()
        {
            // Shallow copy 
            return (Prototype)this.MemberwiseClone();
        }
    }


    class ConcretePrototype2 : Prototype
    {
        // Constructor 
        public ConcretePrototype2(string id)
            : base(id)
        {

        }

        public override Prototype Clone()
        {
            // Shallow copy 
            return (Prototype)this.MemberwiseClone();   //创建当前对象的浅表副本，方法是创建一个新对象，然后将当前对象的非静态字段复制到该新对象，
        }                                               //如果字段是值类型的，则对该对象执行逐位复制，
    }                                                   //如果字段是引用类型的，则复制引用但不复制引用的对象，
                                                        //因此，原始对象及其副本引用同一对象，

}

.NET在System命名空间中提供了ICloneable接口，只有一个方法Clone( )，只需要实现这个接口就可以完成原型模式了，

9.4 简历的原型模式

namespace 原型模式
{
    class Program
    {
        static void Main(string[] args)
        {
            Resume a = new Resume("大鸟");
            a.SetPersonalInfo("男", "29");
            a.SetWorkExperience("1998-2000", "XX公司");

            Resume b = (Resume)a.Clone();
            b.SetWorkExperience("1998-2006", "YY企业");

            Resume c = (Resume)a.Clone();
            c.SetPersonalInfo("男", "24");

            a.Display();
            b.Display();
            c.Display();

            Console.Read();
        }
    }

    //简历
    class Resume : ICloneable
    {
        private string name;
        private string sex;
        private string age;
        private string timeArea;
        private string company;

        public Resume(string name)
        {
            this.name = name;
        }

        //设置个人信息
        public void SetPersonalInfo(string sex, string age)
        {
            this.sex = sex;
            this.age = age;
        }

        //设置工作经历
        public void SetWorkExperience(string timeArea, string company)
        {
            this.timeArea = timeArea;
            this.company = company;
        }

        //显示
        public void Display()
        {
            Console.WriteLine("{0} {1} {2}", name, sex, age);
            Console.WriteLine("工作经历：{0} {1}", timeArea, company);
        }

        public Object Clone()
        {
            return (Object)this.MemberwiseClone();
        }
    }

}

每NEW一次，都需要执行一次构造函数，如果构造函数的执行时间很长，那么多次执行这个初始化就实在是太低效了，一般在初始化的信息不发生变化的情况下，克隆是最好的办法，既隐藏了对象创建的细节，又对性能是大大的提高，

9.5 浅复制与深复制

MemberwiseClone( )方法是这样，如果字段是值类型的，则对该字段执行逐位复制，如果字段是引用类型的，则复制引用但不复制引用的对象，因此，原始对象及其副本引用同一对象，

namespace 原型模式
{
    class Program
    {
        static void Main(string[] args)
        {
            Resume a = new Resume("大鸟");
            a.SetPersonalInfo("男", "29");
            a.SetWorkExperience("1998-2000", "XX公司");

            Resume b = (Resume)a.Clone();
            b.SetWorkExperience("1998-2006", "YY企业");

            Resume c = (Resume)a.Clone();
            c.SetPersonalInfo("男", "24");
            c.SetWorkExperience("1998-2003", "ZZ企业");

            a.Display();
            b.Display();
            c.Display();

            Console.Read();
        }
    }

    //简历
    class Resume : ICloneable
    {
        private string name;
        private string sex;
        private string age;

        private WorkExperience work;

        public Resume(string name)
        {
            this.name = name;
            work = new WorkExperience();
        }

        //设置个人信息
        public void SetPersonalInfo(string sex, string age)
        {
            this.sex = sex;
            this.age = age;
        }

        //设置工作经历
        public void SetWorkExperience(string workDate, string company)
        {
            work.WorkDate = workDate;
            work.Company = company;
        }

        //显示
        public void Display()
        {
            Console.WriteLine("{0} {1} {2}", name, sex, age);
            Console.WriteLine("工作经历：{0} {1}", work.WorkDate, work.Company);
        }

        public Object Clone()
        {
            return (Object)this.MemberwiseClone();
        }

    }

    //工作经历
    class WorkExperience
    {
        private string workDate;

        public string WorkDate
        {
            get { return workDate; }
            set { workDate = value; }
        }

        private string company;

        public string Company
        {
            get { return company; }
            set { company = value; }
        }
    }

}

浅复制，被复制对象的所有变量都含有与原来对象相同的值，而所有的对其它对象的引用都仍然指向原来的对象，

深复制，把引用对象的变量指向复制过的新对象，而不是原有的被引用的对象，

9.6 简历的深复制实现

namespace 原型模式
{
    class Program
    {
        static void Main(string[] args)
        {
            Resume a = new Resume("大鸟");
            a.SetPersonalInfo("男", "29");
            a.SetWorkExperience("1998-2000", "XX公司");

            Resume b = (Resume)a.Clone();
            b.SetWorkExperience("1998-2006", "YY企业");

            Resume c = (Resume)a.Clone();
            c.SetWorkExperience("1998-2003", "ZZ企业");

            a.Display();
            b.Display();
            c.Display();

            Console.Read();
        }
    }

    //简历
    class Resume : ICloneable
    {
        private string name;
        private string sex;
        private string age;

        private WorkExperience work;

        public Resume(string name)
        {
            this.name = name;
            work = new WorkExperience();
        }

        private Resume(WorkExperience work)   //提供Clone方法调用的私有构造函数，以便克隆工作经历数据，
        {
            this.work = (WorkExperience)work.Clone();
        }

        //设置个人信息
        public void SetPersonalInfo(string sex, string age)
        {
            this.sex = sex;
            this.age = age;
        }

        //设置工作经历
        public void SetWorkExperience(string workDate, string company)
        {
            work.WorkDate = workDate;
            work.Company = company;
        }

        //显示
        public void Display()
        {
            Console.WriteLine("{0} {1} {2}", name, sex, age);
            Console.WriteLine("工作经历：{0} {1}", work.WorkDate, work.Company);
        }

        public Object Clone()
        {
            Resume obj = new Resume(this.work);   //调用私有构造函数，克隆工作经历，在给简历相关字段赋值，最终返回深复制简历对象，

            obj.name = this.name;
            obj.sex = this.sex;
            obj.age = this.age;

            return obj;
        }
    }

    //工作经历
    class WorkExperience : ICloneable   //工作经历类实现ICloneable接口，
    {
        private string workDate;

        public string WorkDate
        {
            get { return workDate; }
            set { workDate = value; }
        }

        private string company;

        public string Company
        {
            get { return company; }
            set { company = value; }
        }

        public Object Clone()   //工作经历类实现Clone方法，
        {
            return (Object)this.MemberwiseClone();
        }
    }

    //DataSet Clone() and Copy()
              //浅复制    //深复制

}

9.7 复制简历VS手写求职信