C#_深拷贝与浅拷贝

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Threading.Tasks;

namespace _004深拷贝浅靠背
{
    class Program
    {
        static void Main(string[] args)
        {

            Student s1 = new Student() { Id="123",Name="Joe",Age=16};
            //Student s2 = s1;    //没有发生拷贝  对象只有一个   只是将引用赋值给了 s2



            //Student s2 = new Student();
            //s2.Age = s1.Age;
            //s2.Id = s1.Id;
            //s2.Name = s1.Name;
            //以上才叫发生了拷贝



            //拷贝 一般通过  序列化  来完成拷贝
            Student s2=new Student();
            BinaryFormatter bf = new BinaryFormatter();
            //这里使用的是 内存流  
            byte[] bs = new byte[1000];
            //定义一个内存流  并且将对象序列化到内存中
            using(MemoryStream ms =new MemoryStream(bs))
            {
                //将对象s1 序列化到内存当中去了
                bf.Serialize(ms, s1);
            }
            //然后再将这个流反序列化回来
            using (MemoryStream ms = new MemoryStream(bs))
            {
                s2 = bf.Deserialize(ms) as Student;
            }
            Console.WriteLine(s2.Name + "  "+ s2.Id + "  <s2>  "+ s2.Age);




            s1.Tea = new Teacher() { Name="Zhao"};

            Student s3 = new Student();
            s3.Id = s1.Id;
            s3.Age = s1.Age;
            s3.Name = s1.Name;
            s3.Tea = s1.Tea;//浅拷贝   将引用类型的对象直接指向 s3.Tea    没有创建新对象   赋值的是 对象的引用

            Student s4 = new Student();
            s4.Id = s1.Id;
            s4.Name = s1.Name;
            s4.Age = s1.Age;

            s4.Tea = new Teacher();      //深拷贝  将引用类型 重新new了   创建新对象   将原对象的值赋值过去
            s4.Tea.Name = s1.Tea.Name;


        }
    }


    /// <summary>
    /// 如果要做拷贝的话 尽量不要在类中定义自动属性
    /// </summary>
    /// 
    [Serializable]
    class Student
    {
        private string _id;

        public string Id
        {
            get { return _id; }
            set { _id = value; }
        }

        private string _name;

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

        private int _age;

        public int Age
        {
            get { return _age; }
            set { _age = value; }
        }

        //自定义类型
        private Teacher _tea;
        internal Teacher Tea
        {
            get { return _tea; }
            set { _tea = value; }
        }

    }

    [Serializable]
    class Teacher
    {
        private string _name;

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




}