Net复习笔记：第七部分：浅拷贝和深拷贝

浅拷贝：（shallow copy）

深拷贝：（deep copy）

1. 性能问题，深拷贝要对整个结构树拷贝，性能影响较大
2. 可行性，对整个结构树拷贝，在很多情况下不能实现
3. 稳定性，某些字段涉及循环，深拷贝可能进入死循环
4. 简单，浅拷贝在实现上面比较的简单
5. String（是引用类型的深拷贝实例）

浅拷贝：只要调用继承来的MenberwiseClone()方法就可以啦

深拷贝：要new一个新的对象，然后把内容全部添加进去

namespace NetNiBiXiuZhiDao

{

    public partial class WebForm11 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            Enrollment sourcestudentslist = new Enrollment();

            sourcestudentslist.stud.Add(new Student("elong", 12));

            sourcestudentslist.stud.Add(new Student("tuan", 13));

 

            Enrollment clonestudentslist = sourcestudentslist.NewClone() as Enrollment;

            sourcestudentslist.ShowEnrollmentinfo();

            clonestudentslist.ShowEnrollmentinfo();

 

            clonestudentslist.stud[1].Age = 14;

            clonestudentslist.stud[1].Name = "hotel";

 

            sourcestudentslist.ShowEnrollmentinfo();

            clonestudentslist.ShowEnrollmentinfo();

        }

    }

 

    class Enrollment : ICloneable

    {

        HttpResponse res = HttpContext.Current.Response;

        public List<Student> stud = new List<Student>();

        public Enrollment()

        { }

 

        public Enrollment(List<Student> studli)

        {

            foreach (Student s in studli)

            {

                stud.Add((Student)s.Clone());

            }

        }

 

        public void ShowEnrollmentinfo()

        {

            res.Write("Student :Enrollment<br>");

            foreach (Student str in stud)

            {

                res.Write(string.Format("{0}:{1}", str.Name, str.Age+"<br>"));

            }

        }

 

        public object Clone()

        {

            return MemberwiseClone();

        }

 

        public object NewClone()

        {

            return new Enrollment(stud);

        }

    }

 

    class Student

    {

        HttpResponse res = HttpContext.Current.Response;

        public string Name;

        public int Age;

        public Student(string name, int age)

        {

            Name = name;

            Age = age;

        }

 

        public void Showinfo()

        {

            res.Write(string.Format("{0}:{1}",Name,Age));

        }

 

        public object Clone()

        {

            return MemberwiseClone();

        }

    }

}