C# Params Array

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

---

 static int add(params int[] allnumber)

---

In the preceding line, the allnumber variable can holds n number of parameters at runtime because it is declared with params keyword.

Programming Example of Params Array in C#

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

---

using System;

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

---