Work with constructor's parameters in C#

Named parameters

We can use the named parameters with constructors to initialize the fields.


using System;/*from w w w  .java 2  s.  c  o m*/
class Rectangle {
   public int Width;
   public int Height;
   public Rectangle(int w, int h){
     Width = w;
     Height = h;
   }
}


class Program
{
    static void Main(string[] args)
    {
        Rectangle r = new Rectangle(h : 6, w:5);
        Console.WriteLine(r.Width);
        Console.WriteLine(r.Height);
    }
}

The output:

Optional parameters

Constructors can have optional parameters as well.


using System;//from  w  w w  .  j  a v  a2 s .com
class Rectangle {
   public int Width;
   public int Height;
   public Rectangle(int w = 5, int h = 6){
     Width = w;
     Height = h;
   }
}



class Program
{
    static void Main(string[] args)
    {
        Rectangle r = new Rectangle();
        Console.WriteLine(r.Width);
        Console.WriteLine(r.Height);
    }
}