protected Object MemberwiseClone()

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);
  }
}
// The example displays the following output:
//    Original values of p1 and p2:
//     p1 instance values:
//       Name: Sam, Age: 42
//       Value: 6565
//     p2 instance values:
//       Name: Sam, Age: 42
//       Value: 6565
//   
//    Values of p1 and p2 after changes to p1:
//     p1 instance values:
//       Name: Frank, Age: 32
//       Value: 7878
//     p2 instance values:
//       Name: Sam, Age: 42
//       Value: 7878
//   
//    Values of p1 and p3 after changes to p1:
//     p1 instance values:
//       Name: George, Age: 39
//       Value: 8641
//     p3 instance values:
//       Name: Frank, Age: 32
//       Value: 7878

using System;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
 
namespace CloneDemo
{
  [Serializable]
  class DemoClass
  {
    public int i = 0;
    public int[] iArr = { 1, 2, 3 };
 
    public DemoClass Clone1() //淺CLONE
    {
      return this.MemberwiseClone() as DemoClass;
    }
 
    public DemoClass Clone2() //深clone
    {
      MemoryStream stream = new MemoryStream();
      BinaryFormatter formatter = new BinaryFormatter();
      formatter.Serialize(stream, this);
      stream.Position = 0;
      return formatter.Deserialize(stream) as DemoClass;
    }
  }
 
  class Program
  {
    static void Main(string[] args)
    {
      DemoClass a = new DemoClass();
      a.i = 10;
      a.iArr = new int[] { 8, 9, 10 };
      DemoClass b = a.Clone1();
      DemoClass c = a.Clone2();
 
      // 更改 a 對(duì)象的iArr[0], 導(dǎo)致 b 對(duì)象的iArr[0] 也發(fā)生了變化 而 c不會(huì)變化
       a.iArr[0] = 88;
 
      Console.WriteLine("MemberwiseClone");
      Console.WriteLine(b.i);
      foreach (var item in b.iArr)
      {
        Console.WriteLine(item);
      }
 
      Console.WriteLine("Clone2");
      Console.WriteLine(c.i);
      foreach (var item in c.iArr)
      {
        Console.WriteLine(item);
      }
 
      Console.ReadLine();
    }
  }
}