Csharp/CSharp Tutorial/Class/ICloneable

Cloneable Point

<source lang="csharp">using System; using System.Collections.Generic; using System.Text;

public class Point : ICloneable {

   public int x, y;
   public PointDescription desc = new PointDescription();
   public Point() { }
   public Point(int x, int y) {
       this.x = x; this.y = y;
   }
   public Point(int x, int y, string petname) {
       this.x = x;
       this.y = y;
       desc.petName = petname;
   }
   public object Clone() {
       Point newPoint = (Point)this.MemberwiseClone();
       PointDescription currentDesc = new PointDescription();
       currentDesc.petName = this.desc.petName;
       newPoint.desc = currentDesc;
       return newPoint;
   }
   public override string ToString() {
       return string.Format("X = {0}; Y = {1}; Name = {2};\nID = {3}\n",x, y, desc.petName, desc.pointID);
   }

} public class PointDescription {

   public string petName;
   public Guid pointID;
   public PointDescription() {
       this.petName = "No-name";
       pointID = Guid.NewGuid();
   }

} class Program {

   static void Main(string[] args) {
       Point p1 = new Point(50, 50);
       Point p2 = p1;
       p2.x = 0;
       Console.WriteLine(p1);
       Console.WriteLine(p2);
       Point p3 = new Point(100, 100, "Jane");
       Point p4 = (Point)p3.Clone();
       Console.WriteLine("p3: {0}", p3);
       Console.WriteLine("p4: {0}", p4);
       p4.desc.petName = "Mr. X";
       p4.x = 9;
       Console.WriteLine("p3: {0}", p3);
       Console.WriteLine("p4: {0}", p4);
   }

}</source>

Clone a list of cloneable objects

<source lang="csharp">using System; using System.Text; using System.Collections.Generic; public class Employee : ICloneable {

   public string Name;
   public string Title;
   public int Age;
   public Employee(string name, string title, int age)
   {
       Name = name;
       Title = title;
       Age = age;
   }
   public object Clone()
   {
       return MemberwiseClone();
   }
   public override string ToString()
   {
       return string.Format("{0} ({1}) - Age {2}", Name, Title, Age);
   }

} public class EmployeeList : ICloneable {

   public List<Employee> EmployeeListMembers =  new List<Employee>();
   public EmployeeList()
   {
   }
   private EmployeeList(List<Employee> members)
   {
       foreach (Employee e in members)
       {
           EmployeeListMembers.Add((Employee)e.Clone());
       }
   }
   public void AddMember(Employee member)
   {
       EmployeeListMembers.Add(member);
   }
   public override string ToString()
   {
       StringBuilder str = new StringBuilder();
       foreach (Employee e in EmployeeListMembers)
       {
           str.AppendFormat("  {0}\r\n", e);
       }
       return str.ToString();
   }
   public object Clone()
   {
       return new EmployeeList(this.EmployeeListMembers);
   }

} public class MainClass {

   public static void Main()
   {
       EmployeeList team = new EmployeeList();
       team.AddMember(new Employee("A", "AA", 4));
       team.AddMember(new Employee("B", "BB", 8));
       team.AddMember(new Employee("C", "CC", 8));
       EmployeeList clone = (EmployeeList)team.Clone();
       Console.WriteLine("Original EmployeeList:");
       Console.WriteLine(team);
       Console.WriteLine("Clone EmployeeList:");
       Console.WriteLine(clone);
       Console.WriteLine("*** Make a change to original team ***");
       team.EmployeeListMembers[0].Name = "L";
       team.EmployeeListMembers[0].Title = "M";
       team.EmployeeListMembers[0].Age = 4;
       Console.WriteLine("Original EmployeeList:");
       Console.WriteLine(team);
       Console.WriteLine("Clone EmployeeList:");
       Console.WriteLine(clone);
   }

}</source>

Original EmployeeList:
  A (AA) - Age 4
  B (BB) - Age 8
  C (CC) - Age 8
Clone EmployeeList:
  A (AA) - Age 4
  B (BB) - Age 8
  C (CC) - Age 8
*** Make a change to original team ***
Original EmployeeList:
  L (M) - Age 4
  B (BB) - Age 8
  C (CC) - Age 8
Clone EmployeeList:
  A (AA) - Age 4
  B (BB) - Age 8
  C (CC) - Age 8

Implement ICloneable interface

<source lang="csharp">using System; class MyValue {

   public MyValue(int count)
   {
       this.count = count;
   }
   public int count;

} class MyObject: ICloneable {

   public MyObject(int count)
   {
       this.contained = new MyValue(count);
   }
   public object Clone()
   {
       Console.WriteLine("Clone");
       return(new MyObject(this.contained.count));
   }
   public MyValue contained;

} class MainClass {

   public static void Main()
   {
       MyObject my = new MyObject(33);
       MyObject myClone = (MyObject) my.Clone();
       Console.WriteLine("Values: {0} {1}", my.contained.count, myClone.contained.count);
       myClone.contained.count = 15;
       Console.WriteLine("Values: {0} {1}", my.contained.count, myClone.contained.count);
   }

}</source>

Clone
Values: 33 33
Values: 33 15