设计模式---原型模式

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一、执行一次构造函数，以后的对象是直接 clone出来的

StudentProperty SingletonConle = (StudentProperty)_StudentProperty.MemberwiseClone();

执行的copy是浅拷贝

 public class StudentProperty    {        private StudentProperty()        {            Console.WriteLine("创建对象");        }         private static StudentProperty _StudentProperty = new StudentProperty() {

 Course = new Course() {   CourseId =6, CourseName= "kekekekeek"} };静态对象，也是由操作系统在一开始为静态变量分配好内存        public static StudentProperty CreateIntance()        {            StudentProperty SingletonConle = (StudentProperty)_StudentProperty.MemberwiseClone();            return SingletonConle;        }        public int Id { get; set; }        public string Name { get; set; }        public Course Course { get; set; }    }    public class Course    {        public int CourseId { get; set; }        public string CourseName { get; set; }    }

二、创建对象：

这样创建的两个对象拥有自己的属性和值，但是当设置了 StudentProperty 的 Course 属性后，他们两个的 Course 属性值是相同的，原因是他们指向了相同

的引用地址空间

            StudentProperty StudentProperty1 = StudentProperty.CreateIntance();            StudentProperty1.Id = 1;            StudentProperty1.Name = "学生1";            StudentProperty1.Course.CourseId = 7;            StudentProperty1.Course.CourseName = "课程名称1";            StudentProperty StudentProperty2 = StudentProperty.CreateIntance();            StudentProperty2.Id = 2;            StudentProperty2.Name = "学生2";            StudentProperty2.Course.CourseId = 8;            StudentProperty2.Course.CourseName = "课程名称88888";

这样当 StudentProperty2中 Course 的属性改变 StudentProperty1的值也跟着改变

三、深拷贝：使用序列化和反序列化

            StudentProperty StudentProperty3 = SerializeHelper.DeserializeWithBinary<StudentProperty>(SerializeHelper.SerializeToBinary(StudentProperty2));            StudentProperty3.Course.CourseId = 9;            StudentProperty3.Course.CourseName = "课程名称9999999999";

四、SerializeHelper类

  public static class SerializeHelper    {        /// <summary>        /// 使用UTF8编码将byte数组转成字符串        /// </summary>        /// <param name="data"></param>        /// <returns></returns>        public static string ConvertToString(byte[] data)        {            return Encoding.UTF8.GetString(data, 0, data.Length);        }        /// <summary>        /// 使用指定字符编码将byte数组转成字符串        /// </summary>        /// <param name="data"></param>        /// <param name="encoding"></param>        /// <returns></returns>        public static string ConvertToString(byte[] data, Encoding encoding)        {            return encoding.GetString(data, 0, data.Length);        }        /// <summary>        /// 使用UTF8编码将字符串转成byte数组        /// </summary>        /// <param name="str"></param>        /// <returns></returns>        public static byte[] ConvertToByte(string str)        {            return Encoding.UTF8.GetBytes(str);        }        /// <summary>        /// 使用指定字符编码将字符串转成byte数组        /// </summary>        /// <param name="str"></param>        /// <param name="encoding"></param>        /// <returns></returns>        public static byte[] ConvertToByte(string str, Encoding encoding)        {            return encoding.GetBytes(str);        }        /// <summary>        /// 将对象序列化为二进制数据         /// </summary>        /// <param name="obj"></param>        /// <returns></returns>        public static byte[] SerializeToBinary(object obj)        {            MemoryStream stream = new MemoryStream();            BinaryFormatter bf = new BinaryFormatter();            bf.Serialize(stream, obj);            byte[] data = stream.ToArray();            stream.Close();            return data;        }        /// <summary>        /// 将对象序列化为XML数据        /// </summary>        /// <param name="obj"></param>        /// <returns></returns>        public static byte[] SerializeToXml(object obj)        {            MemoryStream stream = new MemoryStream();            XmlSerializer xs = new XmlSerializer(obj.GetType());            xs.Serialize(stream, obj);            byte[] data = stream.ToArray();            stream.Close();            return data;        }        /// <summary>        /// 将二进制数据反序列化        /// </summary>        /// <param name="data"></param>        /// <returns></returns>        public static object DeserializeWithBinary(byte[] data)        {            MemoryStream stream = new MemoryStream();            stream.Write(data, 0, data.Length);            stream.Position = 0;            BinaryFormatter bf = new BinaryFormatter();            object obj = bf.Deserialize(stream);            stream.Close();            return obj;        }        /// <summary>        /// 将二进制数据反序列化为指定类型对象        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="data"></param>        /// <returns></returns>        public static T DeserializeWithBinary<T>(byte[] data)        {            return (T)DeserializeWithBinary(data);        }        /// <summary>        /// 将XML数据反序列化为指定类型对象        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="data"></param>        /// <returns></returns>        public static T DeserializeWithXml<T>(byte[] data)        {            MemoryStream stream = new MemoryStream();            stream.Write(data, 0, data.Length);            stream.Position = 0;            XmlSerializer xs = new XmlSerializer(typeof(T));            object obj = xs.Deserialize(stream);            stream.Close();            return (T)obj;        }    }

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