Instance Constructors In C# Part 2
In this article we will learn about Instance constructors in C#.
Introduction
In the previous article we can explain Instance Constructors In C# Part 1. In this article we can learn about copy constructor and private constructor in c#
Copy Constructor
If you create a new object and want to copy the values from an existing object then you can use copy constructor. The purpose of a copy constructor is to initialize a new instance to the values of an existing instance.
Example
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ProgramCall
{
class PEPSI
{
int A, B;
public PEPSI(int X, int Y)
{
A = X;
B = Y;
}
//Copy Constructor
public PEPSI(PEPSI P)
{
A = P.A;
B = P.B;
}
public void Print()
{
Console.WriteLine("A = {0}\tB = {1}", A, B);
}
}
class CopyConstructor
{
static void Main()
{
PEPSI P = new PEPSI(10,11);
//Invoking copy constructor
PEPSI P1 = new PEPSI(P);
P.Print();
P1.Print();
Console.Read();
}
}
}
The output of following program
Private Constructor
We can use private constructor in C#. Private constructor is created with Private specifier. In C# we can not create an instance of a class which contains at least one private constructor. They are usually used in classes that contain static members only.
Example
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace defaultConstractor
{
public class like
{
private like() //private constrctor declaration
{
}
public static int currentview;
public static int visitedCount()
{
return ++ currentview;
}
}
class viewCountedetails
{
static void Main()
{
// like r = new like(); // Error
Console.WriteLine("-------Private constructor----------");
Console.WriteLine();
like.currentview = 100;
like.visitedCount();
Console.WriteLine("Now the view count is: {0}", like.currentview);
Console.ReadLine();
}
}
}
The output of following program
