C# Params Array

In this chapter you will learn:

• What is param array in C#?
• What is the advantage of using param array?
• How to use param array in C# programming?

Sometimes, you are not assured about a number of parameters or you want to create a method that can accept n number of parameters at runtime. This situation can be handled with params type array in C#. The params keyword creates an array at runtime that receives and holds n number of parameters.

static int add(params int[] allnumber)

Programming Example of Params Array in C#

In this example, we are creating a function add() that will receive any number of integer parameters at runtime and returns the sum of all those numbers. We will use params array to achieve this goal in C#.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace params_array
{
    class Program
    {
        static int add(params int[] allnumber)
        {
            int sum = 0;
            foreach (int n in allnumber)
            {
                sum = sum + n;
            }
            return sum;
        }
        static void Main(string[] args)
        {
            int sum;
            // passing three parameters
            sum = Program.add(1, 2, 3);
            Console.WriteLine("Sum of 1,2,3 is:\t{0}", sum);

            // passing five parameters
            sum = Program.add(3, 5, 2, 6, 2);
            Console.WriteLine("Sum of 3,5,2,6,2 is:\t{0}", sum);
            Console.ReadLine();
        }
    }
}

Output

Sum of 1,2,3 is:         6

Sum of 3,5,2,6,2 is:   18

__

Summary

In this chapter you learned about param array in C#. You also learned how to use param array in C# programming. In next chapter you will learn how to pass array as parameter.

More Examples