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C# Passing Array to Function

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In this tutorial, we will learn how to pass an array to function in C#. Before that you need to have an idea on following topics in C#.

We use a function to reuse a block of code in a program. And we can pass an array to the function as a parameter. To pass an array, we need to provide an array name as an argument of a function. Example:

//passing array 
function_name(array_name);

C# Passing Array to Function

Let us see it in a demonstration for passing an array to a function in C#. We will pass an array and find the largest element in a function.

//C# program to fincd largest element in an array

using System;

namespace Arrays
{
   public class ArrayToFunction
   {
      static void maxElement(int[] arr, int arr_size)
      {
         int max = arr[0];
         for (int i = 1; i < arr_size; i++)
         {
            if (max < arr[i])
            {
               max = arr[i];
            }
         }

         Console.WriteLine("Largest element is: " + max);
      }

      public static void Main(string[] args)
      {
         int[] arr = { 77, 85, 98, 14, 50 };

        	//passing array to function
         maxElement(arr, 5);
      }
   }
}

Output:

Largest element is: 98

Another Example: C# Program to find the sum of all the elements present in an array.

In the program below, we will return the sum value from the user-defined function to the main function.

And you can see that, unlike the above example where we declared the function static, here function is non-static which means we need an object reference of the class to access a non-static function. Object obj is created as an instance of ArrayToFunc class.

using System;

namespace Arrays
{
   class ArrayToFunc
   {
      int getSum(int[] arr, int size)
      {
         int i;
         int sum = 0;

         for (i = 0; i < size; ++i)
         {
            sum += arr[i];
         }

         return sum;
      }

      static void Main(string[] args)
      {
         ArrayToFunc obj = new ArrayToFunc();

         //ceating and initializing array
         int[] arr = new int[] { 10, 20, 30, 40, 50 };
         int result;

         //Passing array to a function and
         //storing the returned value in a result variable
         result = obj.getSum(arr, 5);

         //Display
         Console.WriteLine("Sum of all the elements: {0} ", result);
      }
   }
}

Output:

Sum of all the elements: 150

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