C#复制和深度复制的实现方法

深度复制与浅表复制的区别在于，浅表复制只复制值类型的值，而对于实例所包含的对象依然指向原有实例。

 class Program
  {
    [Serializable]
    public class Car 
    {
      public string name;
      public Car(string name)
      {
        this.name = name;
      }
    }
    [Serializable]
    public class Person:ICloneable
    {
      public int id;
      public string name;
      public Car car;
      public Person()
      {
      }
      public Person(int id, string name, Car car)
      {
        this.id = id;
        this.name = name;
        this.car = car;
      }

      public Object Clone() //实现ICloneable接口，达到浅表复制。浅表复制与深度复制无直接有关系。 对外提供一个创建自身的浅表副本的能力
      {
        return this.MemberwiseClone();
      }

    }

    //要复制的实例必须可序列化，包括实例引用的其它实例都必须在类定义时加[Serializable]特性。
    public static T Copy<T>(T RealObject)
    {
      using (Stream objectStream = new MemoryStream())
      {
        //利用 System.Runtime.Serialization序列化与反序列化完成引用对象的复制  
        IFormatter formatter = new BinaryFormatter();
        formatter.Serialize(objectStream, RealObject);
        objectStream.Seek(0, SeekOrigin.Begin);
        return (T)formatter.Deserialize(objectStream);
      }
    }  

   
    static void Main(string[] args)
    {
      Person p1 = new Person(1, "Scott", new Car("宝马"));
      Console.WriteLine("原始值：P1:id={0}----------->name={1}------>car={2}", p1.id, p1.name, p1.car.name);
      Person p2 = Copy<Person>(p1); //克隆一个对象
      Person p3 = p1.Clone() as Person;//浅表复制
      Console.WriteLine("改变P1的值");
      p1.id = 2;
      p1.name = "Lacy";
      p1.car.name = "红旗";
      Console.WriteLine("P1:id={0}----------->name={1}------>car={2}", p1.id, p1.name, p1.car.name);
      Console.WriteLine("深度复制：P2:id={0}----------->name={1}------>car={2}", p2.id, p2.name, p2.car.name);
      Console.WriteLine("浅表复制：P3:id={0}----------->name={1}------>car={2}", p3.id, p3.name, p3.car.name);
      Console.ReadKey();

    }

List<T> oldList = new List<T>(); 
oldList.Add(..); 
List<T> newList = new List<T>(oldList);