深复制和浅复制

using System;
public class IdInfo
{
    public int IdNumber = 2;

}

public class Person : ICloneable
{
    public int Age;
    public string Name;
    public IdInfo IdInfo;
    public Person()
    { IdInfo = new IdInfo(); }
    public Person ShallowCopy()//浅赋值也成为影子拷贝
    {
        return (Person)(MemberwiseClone());
    }

    public object Clone()//深复制
    {
        Person other;
        other=(Person)this.MemberwiseClone();//语句1
        语句1执行完后，局部变量other的值类型成员有了自己的空间，但是引用类型成员IdInfo指向的是this所指的空间，也就是说other和this所指的变量共同指向同一个空间
        other.IdInfo = new IdInfo();//语句2  这句执行后other的引用类型的成员IdInfo有了属于自己的空间
        return other;
    }
}
 //语句1和语句2的顺序不能颠倒，不然会发生如下错误


public class Example
{
    public static void Main()
    {

        Person p1 = new Person();
        p1.Age = 11;
        p1.Name = "lei";
        Person p2 = p1.ShallowCopy();
        Person p3 = (Person)p1.Clone();
        Console.WriteLine("Original values of p1 and p2,p3:");
        Console.WriteLine("   p1 instance values: ");
        DisplayValues(p1);
        Console.WriteLine("   p2 instance values:");
        DisplayValues(p2);
        Console.WriteLine("   p3 instance values: ");
        DisplayValues(p3);
       // Change the value of p1 properties and display the values of p1 and p2,p3.
        p1.Age = 12; //p1改变观看p2,p3的变化;
        p1.Name = "cao"; 
        p1.IdInfo.IdNumber = 3;
        p3.IdInfo.IdNumber = 4;//p3的值改变
        Console.WriteLine("\nValues of p1 and p2 after changes to p1:");
        Console.WriteLine("   p1 instance values: ");
        DisplayValues(p1);
        Console.WriteLine("   p2 instance values:");
        DisplayValues(p2);
        Console.WriteLine("   p3 instance values: ");
        DisplayValues(p3);
        Console.ReadLine();
       }

    public static void DisplayValues(Person p)
    {
        Console.WriteLine("      Name: {0:s}, Age: {1:d}", p.Name, p.Age);
        Console.WriteLine("      Value: {0:d}", p.IdInfo.IdNumber);
    }
}

using System;

public class IdInfo
{
    public int IdNumber;

    public IdInfo(int IdNumber)
    {
        this.IdNumber = IdNumber;
    }
}

public class Person 
{
    public int Age;
    public string Name;
    public IdInfo IdInfo;

    public Person ShallowCopy()
    {
       return (Person)this.MemberwiseClone();
    }

    public Person DeepCopy()
    {
       Person other = (Person) this.MemberwiseClone(); 
       other.IdInfo = new IdInfo(this.IdInfo.IdNumber);
       return other;
    }
}

public class Example
{
    public static void Main()
    {
        // Create an instance of Person and assign values to its fields.
        Person p1 = new Person();
        p1.Age = 42;
        p1.Name = "Sam";
        p1.IdInfo = new IdInfo(6565);

        // Perform a shallow copy of p1 and assign it to p2.
        Person p2 = (Person) p1.ShallowCopy();

        // Display values of p1, p2
        Console.WriteLine("Original values of p1 and p2:");
        Console.WriteLine("   p1 instance values: ");
        DisplayValues(p1);
        Console.WriteLine("   p2 instance values:");
        DisplayValues(p2);

        // Change the value of p1 properties and display the values of p1 and p2.
        p1.Age = 32;
        p1.Name = "Frank";
        p1.IdInfo.IdNumber = 7878;
        Console.WriteLine("\nValues of p1 and p2 after changes to p1:");
        Console.WriteLine("   p1 instance values: ");
        DisplayValues(p1);
        Console.WriteLine("   p2 instance values:");
        DisplayValues(p2);

        // Make a deep copy of p1 and assign it to p3.
        Person p3 = p1.DeepCopy();
        // Change the members of the p1 class to new values to show the deep copy.
        p1.Name = "George";
        p1.Age = 39;
        p1.IdInfo.IdNumber = 8641;
        Console.WriteLine("\nValues of p1 and p3 after changes to p1:");
        Console.WriteLine("   p1 instance values: ");
        DisplayValues(p1);
        Console.WriteLine("   p3 instance values:");
        DisplayValues(p3);
    }

    public static void DisplayValues(Person p)
    {
        Console.WriteLine("      Name: {0:s}, Age: {1:d}", p.Name, p.Age);
        Console.WriteLine("      Value: {0:d}", p.IdInfo.IdNumber);
    }
}
http://msdn.microsoft.com/zh-cn/library/system.object.memberwiseclone(v=vs.110).aspx

ICloneable 接口
支持克隆，即用与现有实例相同的值创建类的新实例。
public interface ICloneable
ICloneable 类型公开以下成员。
ICloneable.Clone 方法
创建作为当前实例副本的新对象。
Object Clone()
返回值
类型：System.Object
作为此实例副本的新对象。

Object.MemberwiseClone 方法
创建当前 Object 的浅表副本。
protected Object MemberwiseClone()
返回值
类型：System.Object
当前 Object 的浅表副