Named parameters

In this chapter you will learn:

How to define named parameters for methods
Method call and named parameters
Mix the positional parameter and named parameter

Defined named parameters

With named parameters we can specify parameters by name not by position.

using System;// jav  a2 s. c  om

class Program
{
    static void output(int i, int j)
    {
        Console.WriteLine("i=" + i);
        Console.WriteLine("j=" + j);

    }


    static void Main(string[] args)
    {

        output(j : 10, i : 5);
    }
}

The output:

Method call and named parameters

The evaluation sequence of named parameter is determined by the method call.

using System;/* ja v a  2 s . c o  m*/

class Program
{
    static void output(int i, int j)
    {
        Console.WriteLine("i=" + i);
        Console.WriteLine("j=" + j);
    }

    static void Main(string[] args)
    {
        int k = 10;
        output(j : k++, i : k++);
    }
}

The output:

Mix the positional parameter and named parameter

We can also mix the positional parameter and named parameter.

using System;/*from   j  a v  a2 s  .c  o  m*/

class Program
{
    static void output(int i, int j)
    {
        Console.WriteLine("i=" + i);
        Console.WriteLine("j=" + j);

    }

    static void Main(string[] args)
    {
        int k = 10;
        output(k, j : 20);
    }
}

The output:

The positional parameters have to be before the named parameters.

using System;//from   j a  v a 2s.c o  m

class Program
{
    static void output(int i, int j)
    {
        Console.WriteLine("i=" + i);
        Console.WriteLine("j=" + j);

    }

    static void Main(string[] args)
    {

        int k = 10;
        output(j : 20, k );

    }
}