Introduction to clone() in C#
Clone() in C# is a method of string that is used to return the exact copy of an object. It returns the instance of the string. The return is just the copy with a different view. This method is also useful if we want to clone an array. In the case of the array, it creates a copy of the array with the same number of elements. ICloneable interface is also used which calls the Clone method to copy the data. No parameters will be required by this method.
Syntax of implementing clone()
public object Clone()
Syntax of implementing ICloneable()
public interface ICloneable
{
object Clone();
}
As you can see it won’t require any parameter and it returns a reference.
If we want to modify a cloned object, we can and doing this will not modify the original object.
Using the clone() method makes easy for the developers as they need to write less code and which is easy to understand. There is no other special attribute require along with this and it copies all types of properties. We can call this method inside the class only. It returns object so we need to do casting when we use this method. It is good to implement this method in all classes to clone. We can achieve it by using two techniques 1. Deep copy 2. Shallow copy.
Shallow copying is creating a new object and then copying the non-static fields of the current object to the new object. On the other hand, deep copying is creating a new object then copying the non-static fields of the current object to the new object.
Examples of clone() in C#
Below are the examples that show how we can implement Clone() and ICloneable interface in C#.
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Example #1
Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Clone
{
class Program
{
static void Main(string[] args)
{
string s1 = "This is C# programming";
string s2 = (String)s1.Clone();
// Displaying both the strings
Console.WriteLine("String to be cloned : {0}", s1);
Console.WriteLine("Cloned String : {0}", s2);
Console.ReadLine();
}
}
}
In the above example, there is a string which we need to clone. Clone() is used to clone this string object. It basically returns another copy of the data. So we can say that the return value is the same data with another view. No parameters are required with this method. In the output, you can see that it is displaying original string and cloned string which is the exact copy of the original one.
Output
Example #2
Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Clone
{
class Program
{
static void Main(string[] args)
{
// array initialization
string[] arraytobecloned = { "This", "is", "C#", "clone", "example"};
string[] clonedarray = arraytobecloned.Clone() as string[]; //cloning array
// display original and cloned arrays
Console.WriteLine(string.Join(",", arraytobecloned));
Console.WriteLine(string.Join(",", clonedarray));
Console.WriteLine();
Console.ReadLine();
}
}
}
In the above example, an array with a set of elements is defined which needs to be cloned. Clone() is used to clone all the elements of the array. In the output, you can see that it has created a similar copy of an array.
Output
Example #3
Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Clone
{
class Program
{
static void Main(string[] args)
{
string[] arraytobecloned = { "This", "is", "C#", "clone", "example" };
string[] clonedarray = arraytobecloned.Clone() as string[];
Console.WriteLine(string.Join(",", arraytobecloned));
Console.WriteLine(string.Join(",", clonedarray));
Console.WriteLine();
clonedarray[4] = "demo"; // providing new value to cloned array element
Console.WriteLine(string.Join(",", arraytobecloned)); // displaying arrays
Console.WriteLine(string.Join(",", clonedarray));
Console.ReadLine();
}
}
}
In the above example, a set of the array is defined which contains different elements. The clone() method is used to clone those elements. We can also change the value of any element of that cloned array. In the output, first, it is displaying the given array and the cloned array. We can also change the value by passing its indexing position. After passing the value, it is displaying the cloned array with a new set of values. So which means we can modify the value of cloned array which don’t disturb the original array elements value.
Output
Example #4
Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Clone
{
class Employee : ICloneable // implementing ICloneable interface
{
int empcode;
string name;
public Employee(int empcode, string name)
{
this.empcode = empcode;
this.name = name;
}
public object Clone()
{
return new Employee(this.empcode, this.name);
}
public override string ToString()
{
return string.Format("empcode = {0}, name = {1},",
this.empcode,
this.name
);
}
}
class Program
{
static void Main() // main method
{
Employee e1 = new Employee(10, "John");
Employee e2 = e1.Clone() as Employee;
Console.WriteLine("1. {0}", e1);
Console.WriteLine("2. {0}", e2);
Console.ReadLine();
}
}
}
In the above example, the ICloneable interface is implemented and the clone() method is used to clone the object. There is a public constructor with the number of arguments and after this clone, the method is invoked.
Output
Example #5
Code
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Clone
{
class Program
{
static void Main(string[] args)
{
//declare and initialize a stack
Stack stack1 = new Stack();
stack1.Push(10);
stack1.Push(20);
stack1.Push(30);
stack1.Push(40);
stack1.Push(50);
Console.WriteLine("Stack elements are...");
foreach (int val in stack1)
{
Console.WriteLine(val);
}
Stack stack2 = (Stack)stack1.Clone();
Console.WriteLine("Stack cloned elements are");
foreach (int val in stack2)
{
Console.WriteLine(val);
Console.ReadLine();
}
}
}
}
In the above example, a stack is defined and using the push method to insert elements. Stack. The clone() method is used to clone the stack with all its elements. Displaying the original stack and cloned stack with all the elements using foreach.
Output
Conclusion
So Clone() is used to copy the object and returns the instance. Using this method we can clone array also with the same number of elements. ICloneable is also be implemented which is basically calls that clone method to copy data. It is t good to implement Clone as it makes code easier for developers.
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