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How to use params Keyword in C Sharp.NET (C#.NET)

27 Apr

One can create a method that displays any number of integers to the console by passing in an array of integers and then iterating over the array with a foreach loop. The params keyword allows you to pass in a variable number of parameters without necessarily explicitly creating the array.

In the next example, we will create a method, DisplayVals(), that takes a variable number of integer arguments:

public void DisplayVals(params int[] intVals)

The method itself can treat the array as if an integer array were explicitly created and passed in as a parameter. We are free to iterate over the array as you would over any other array of integers:

foreach (int i in intVals)

{

Console.WriteLine(“DisplayVals {0}”,i);

}

The calling method, however, need not explicitly create an array: it can simply pass in integers, and the compiler will assemble the parameters into an array for the DisplayVals( ) method:

t.DisplayVals(5,6,7,8);

We are free to pass in an array if you prefer:

int [] explicitArray = new int[5] {1,2,3,4,5};

t.DisplayVals(explicitArray);

This example provides the complete source code illustrating the params keyword.

using System;

using System.Collections.Generic;

using System.Text;

namespace UsingParams

{

public class Tester

{

static void Main( )

{

Tester t = new Tester( );

t.DisplayVals(5,6,7,8);

int [] explicitArray = new int[5] {1,2,3,4,5};

t.DisplayVals(explicitArray);

}

public void DisplayVals(params int[] intVals)

{

foreach (int i in intVals){

Console.WriteLine(“DisplayVals {0}”,i);

}

}

}

}

Output:

DisplayVals 5

DisplayVals 6

DisplayVals 7

DisplayVals 8

DisplayVals 1

DisplayVals 2

DisplayVals 3

DisplayVals 4

DisplayVals 5

Thanks
(Faisal Sikder)

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7 Comments

Posted by on April 27, 2010 in .NET, Programming

 

Tags: , ,

7 responses to “How to use params Keyword in C Sharp.NET (C#.NET)

  1. sidharthan

    February 23, 2012 at 8:33 am

    I execute this program.This output is wrong.Please explain correct program explanation

     
  2. sidharthan

    February 23, 2012 at 8:36 am

    The Output comes only 5 6 78 only

     
    • Faisal Sikder

      February 24, 2012 at 12:12 am

      Hello Sidharthan

      Thanks for comment.

      I have tested it ri8 now and got the right answer. I am little bit confused, where is the problem ?? Its a very straightforward code, it should work.
      If you only get 5 6 7 8 then your second ” t.DisplayVals(explicitArray) ” is not working. please try to debug why its not calling.

      Faisal

       
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  4. megass

    February 25, 2013 at 2:03 am

    Hello, I enjoy reading all of your post. I like to write a little comment to support
    you.

     

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