在构造函数中创建防御副本

Question

以下只是示例代码，用于解释我无法理解的问题：

假设我有以下教授类，请注意公共 getter 和 setter：

    public class Professor
    {
        public string id {get; set; }
        public string firstName{get; set;}
        public string lastName {get; set;}

        public Professor(string ID, string firstName, string lastname)
        {
            this.id = ID;
            this.firstName = firstName;
            this.lastName = lastname;
        }


    }

课程：

public class Course
{
    string courseCode {get; private set;}
    string courseTitle {get; private set;}
    Professor teacher {get; private set;}

    public Course(string courseCode, string courseTitle, Professor teacher)
    {
        this.courseCode = courseCode;
        this.courseTitle = courseTitle;

    }
}

如何在 Course 类中制作 Professor 对象的防御性副本？ here 提供的示例对日期对象是这样处理的。

fDateOfDiscovery = new Date(aDateOfDiscovery.getTime());

可以对 Course 类中的教授对象做同样的事情吗？

更新：

接受提供的答案是我想出的，对吗？

public class Professor
{
 public string id {get; set; }
 public string firstName{get; set;}
 public string lastName {get; set;}

 Professor(string ID, string firstName, string lastname)
  {
       this.id = ID;
       this.firstName = firstName;
       this.lastName = lastname;
  }

 //This method can be either static or not
 //Please note that i do not implement the ICloneable interface. There is discussion in the community it should be marked as obsolete because one can't tell if it's doing a shallow-copy or deep-copy
 public static Professor Clone(Professor original)
 {
   var clone = new Professor(original.id, original.firstName, original.lastName);
   return clone;
 }
}

//not a method, but a constructor for Course
public Course (string courseCode, string courseTitle, Professor teacher)
{
    this.courseCode = courseCode;
    this.courseTitle = courseTitle;
    this.teacher = Professor.Clone(teacher)

}

Answer 1

您可以克隆您的教授实例。

克隆逻辑应该在Professor 类中。

然后您可以在Course 构造函数中接收已克隆的教授实例

public class Professor
{
 public string id {get; set; }
 public string firstName{get; set;}
 public string lastName {get; set;}

 Professor(string ID, string firstName, string lastname)
  {
       this.id = ID;
       this.firstName = firstName;
       this.lastName = lastname;
  }

 //This method can be either static or not
 //Please note that i do not implement the ICloneable interface. There is discussion in the community it should be marked as obsolete because one can't tell if it's doing a shallow-copy or deep-copy
 public static Professor Clone(Professor original)
 {
   var clone = new Professor(original.id, original.firstName, original.lastName);
   return clone;
 }
}

然后，当您调用新的 Course 时，您将执行此操作

public Course AddCourse(string courseCode, string courseTitle, Professor original)
{
  var clonedProfessor = Professor.Clone(original);
  var course = new Course(courseCode, courseTitle, clonedProfessor);
  return course;
}