c#学习笔记-深度复制 与浅度复制

关于值类型和引用类型：

浅度复制(shallow copy)只复制值类型(char,int )的值，而对于引用类型不会复制，浅度复制可以通过派生于System.Object的MemberwiseClone()方法来完成，这是一个受保护的方法。因为他并没有考虑引用类型成员，因此新对象的引用成员就会指向源对象中的相同成员引用的对象

如果要创建成员的新实例(复制值，而不是复制引用)就需要用到深度复制(deep copy)

深度复制需要实现一个ICloneable接口，如果使用这个接口需要实现它包含的Clone()方法，这个方法返回一个System.Object的值，

下面看下浅度复制：

 public class Company
     {
         public string value { get; set; }
     }

     public class Phone
     {
        public string color { get; set; }

        public  Company company = new Company();

         public Phone (string newCompany)
         {
             company.value = newCompany;
         }

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

  static void Main(string[] args)
         {
             Phone phone = new Phone("xiaomi");
             phone.color = "red";
             Phone phone1 = (Phone)phone.getCopy();
             Console.WriteLine($"phone company:{phone.company.value} color: {phone.color}");
             Console.WriteLine($"phone1 company:{phone1.company.value} color: {phone1.color}");

             Console.WriteLine("浅度复制修改新对象的值");

             phone1.company.value = "huawei";
             phone1.color = "green";
             Console.WriteLine($"phone company:{phone.company.value} color: {phone.color}");
             Console.WriteLine($"phone1 company:{phone1.company.value} color: {phone1.color}");
             Console.ReadKey();

         }

实验现象：

浅度复制在后引用类型修改后，原对象也跟着发生了改变

修改这个问题，可以使用深度复制

 public class Company
     {
         public string value { get; set; }
     }

     public class Phone:ICloneable
     {
        public string color { get; set; }

        public  Company company = new Company();

         public Phone (string newCompany)
         {
             company.value = newCompany;
         }

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

         public object Clone()
         {
             Phone newPhone = new Phone(company.value);
             return newPhone;
             //newPhone.company.value = this.company.value;

         }
     }

 static void Main(string[] args)
         {
             Phone phone = new Phone("xiaomi");
             phone.color = "red";
             Phone phone1 = (Phone)phone.Clone();
             Console.WriteLine($"phone company:{phone.company.value} color: {phone.color}");
             Console.WriteLine($"phone1 company:{phone1.company.value} color: {phone1.color}");

             Console.WriteLine("浅度复制修改新对象的值");

             phone1.company.value = "huawei";
             phone1.color = "green";
             Console.WriteLine($"phone company:{phone.company.value} color: {phone.color}");
             Console.WriteLine($"phone1 company:{phone1.company.value} color: {phone1.color}");
             Console.ReadKey();

         }

实验现象