using System.IO;
using System.Runtime.Serialization;
namespace DeepCopyExp
{
  class DeepCopy
  {
    public static T DeepCopyByDCS<T>(T obj)
    {      
      T newObject;
      using (MemoryStream memoryStream = new MemoryStream())
      {
        DataContractSerializer dcs = new DataContractSerializer(obj.GetType());
        dcs.WriteObject(memoryStream, obj);
        memoryStream.Seek(0, SeekOrigin.Begin);
        newObject = (T)dcs.ReadObject(memoryStream);
      }
      return newObject;
    }
  }
}

using System;
namespace DeepCopyExp
{
  class Program
  {
    static void Main(string[] args)
    {
      Student s = new Student()
      {
        Id = 1,
        Name = "三五月兒",
        Score = new Score() { ChineseScore =100, MathScore=100}
      };
      Student s1 = DeepCopy.DeepCopyByDCS(s);
      Console.WriteLine("Id = {0}, Name = {1}, Score.ChineseScore = {2}, Score.MathScore = {3}", s1.Id, s1.Name, s1.Score.ChineseScore, s1.Score.MathScore);
    }
  }
  public class Score
  {
    public int ChineseScore { get; set; }
    public int MathScore { get; set; }
  }
  public class Student
  {
    public int Id { get; set; }
    public string Name { get; set; }
    public Score Score { get; set; }
  }
}

s.Id = 2;
s.Name = "sanwuyueer";
s.Score = new Score() { ChineseScore = 0, MathScore = 0 };