C# - Copy Constructor in C# with Example

Introduction:

Here I will explain what is copy constructor in c# with example. Copy constructor in c# is used to create new instance to the values of an existing instance.

Description:

In previous posts I explained create captcha with refresh button in asp.net, use of virtual, override and new keyword with examples in c#, method overloading and overriding, delegates example in c#, sealed class in c#, using statement in c#, OOPS examples in c# and many articles relating to interview questions in c#, asp.net, SQL server, JavaScript, jQuery. Now I will explain copy constructor in c#.net with example.

Constructor is a special method of a class which will invoke automatically whenever instance or object of class is created. Constructors are responsible for object initialization and memory allocation of its class. If we create any class without constructor, the compiler will automatically create one default constructor for that class. There is always at least one constructor in every class. To know more about constructors check this link Constructors in c# with example.

Copy Constructor

A parameterized constructor that contains a parameter of same class type is called as copy constructor. Main purpose of copy constructor is to initialize new instance to the values of an existing instance. Check below example for this

using System; namespace ConsoleApplication3 { class Sample { public string param1, param2; public Sample(string x, string y) { param1 = x; param2 = y; } public Sample(Sample obj)     // Copy Constructor { param1 = obj.param1; param2 = obj.param2; } } class Program { static void Main(string[] args) { Sample obj = new Sample("Welcome", "Aspdotnet-Suresh");  // Create instance to class Sample Sample obj1=new Sample(obj); // Here obj details will copied to obj1 Console.WriteLine(obj1.param1 +" to " + obj1.param2); Console.ReadLine(); } } }

When we run above program it will show output like as shown below

Output

Welcome to Aspdotnet-Suresh

I hope it helps you to know about copy constructor. If you want to read more about constructors check this link Constructors in c# with example

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