关于C#类对象克隆问题： 浅克隆和深克隆

运行下面一段代码，就知道了：

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

namespace DeepCloneProj
{
    class Program
    {
        static void Main(string[] args)
        {
            A originalInstance = new A(1, "Norton");
            originalInstance.A3.Add(2);
            originalInstance.A3.Add(3);

            WriteData("[SOURCE]", originalInstance);

            Console.WriteLine("-----------------BEFORE-------------------------");

            A shallowClonedInstance = originalInstance.Clone() as A;
            WriteData("[SHALLOW CLONED]", shallowClonedInstance);

            Console.WriteLine("-----------------BEFORE-------------------------");

            A deepClonedInstance = originalInstance.DeepClone() as A;
            WriteData("[DEEP CLONED]", deepClonedInstance);

            Console.WriteLine("-----------------BEFORE-------------------------");
            Console.WriteLine();
            Console.WriteLine("Change the A2 value: originalInstance.A2="FlexWorkflow"");
            originalInstance.A2 = "FlexWorkflow";
            Console.WriteLine("Add a new value for originalInstance.A3: originalInstance.A3.Add(100)");
            Console.WriteLine();
            originalInstance.A3.Add(100);

            Console.WriteLine("-----------------AFTER-------------------------");

            WriteData("[SOURCE]", originalInstance);

            Console.WriteLine("-----------------AFTER-------------------------");

            WriteData("[SHALLOW CLONED]", shallowClonedInstance);

            Console.WriteLine("-----------------AFTER-------------------------");

            WriteData("[DEEP CLONED]", deepClonedInstance);

            Console.Read();

        }

        private static void WriteData(string source, A originalInstance)
        {
            Console.WriteLine("Instance:{0}", source);
            Console.WriteLine("originalInstace.A1:{0}", originalInstance.A1);
            Console.WriteLine("originalInstace.A2:{0}", originalInstance.A2);
            Console.WriteLine("originalInstace.A3:");
            foreach (int value in originalInstance.A3)
            {
                Console.WriteLine(value);
            }
        }
    }

    [Serializable]
    public class A : ICloneable
    {
        private int _a1;
        private string _a2;
        private IList<int> _a3;

        public A(int a1, string a2)
        {
            this._a1 = a1;
            this._a2 = a2;
            this._a3 = new List<int>();
        }

        public int A1
        {
            get
            {
                return this._a1;
            }
        }

        public string A2
        {
            get
            {
                return this._a2;
            }
            set
            {
                this._a2 = value;
            }
        }

        public IList<int> A3
        {
            get
            {
                return this._a3;
            }
        }

        public object DeepClone()
        {
            object clonedInstance = null;
            using (MemoryStream stream = new MemoryStream())
            {
                try
                {
                    BinaryFormatter formatter = new BinaryFormatter();
                    formatter.Serialize(stream, this);
                    stream.Position = 0;
                    clonedInstance = formatter.Deserialize(stream);
                }
                catch
                {
                    throw;
                }
            }

            return clonedInstance;
        }

        public object Clone()
        {
            return MemberwiseClone();
        }
    }
}

 运行结果：

Instance:[SOURCE]
originalInstace.A1:1
originalInstace.A2:Norton
originalInstace.A3:
2
3
-----------------BEFORE-------------------------
Instance:[SHALLOW CLONED]
originalInstace.A1:1
originalInstace.A2:Norton
originalInstace.A3:
2
3
-----------------BEFORE-------------------------
Instance:[DEEP CLONED]
originalInstace.A1:1
originalInstace.A2:Norton
originalInstace.A3:
2
3
-----------------BEFORE-------------------------

Change the A2 value: originalInstance.A2="FlexWorkflow"
Add a new value for originalInstance.A3: originalInstance.A3.Add(100)

-----------------AFTER-------------------------
Instance:[SOURCE]
originalInstace.A1:1
originalInstace.A2:FlexWorkflow
originalInstace.A3:
2
3
100
-----------------AFTER-------------------------
Instance:[SHALLOW CLONED]
originalInstace.A1:1
originalInstace.A2:Norton
originalInstace.A3:
2
3
100
-----------------AFTER-------------------------
Instance:[DEEP CLONED]
originalInstace.A1:1
originalInstace.A2:Norton
originalInstace.A3:
2
3