Add values in C# array (Multiple ways)

If you are working with arrays in C#, then you will definitely need to add some values in array, so in this article, I have mentioned how to add element to array c# or how to add item to array c# with console application example.

Using Basic For loop

You can use simple for loop to add values in C# array, here is an example of using it.

using System;
using System.Linq;

namespace PushValuesInArray
{
    public class Program
    {
        public static void Main()
        {
            int[] arr = new int[5];
            for (int i = 0; i < arr.Length; i++)
            {
                //add values
                arr[i] = i+1;
            }
            //print
            Array.ForEach(arr, (e) => Console.WriteLine(e));
        }

    }
}

Output:

1
2
3
4
5

But this can be useful method only if your array is new, if you already have some values in your array and want to add more values, you can use Linq method or Array Resize.

Using Array.Resize

In this method, we will simply increase current Array size and set value of new array location.

using System;
using System.Linq;

namespace PushValuesInArray
{
    public class Program
    {
        public static void ArrayPush<T>(ref T[] table, object value)
        {
            // Resizing the array for the cloned length (+-) (+1)
            Array.Resize(ref table, table.Length + 1);
            // Setting the value for the new element
            table.SetValue(value, table.Length - 1);
        }

        public static void Main()
        {
            string[] fruits = { "apple", "orange" };
            ArrayPush(ref fruits, "banana");
            Array.ForEach(fruits, (e) => Console.WriteLine(e));
        }

    }
}

Output

apple
orange
banana

Using Linq

This method can be useful, if you have some values in array and want to add more values.

Here is an complete example for you.

using System;
using System.Linq;

namespace PushValuesInArray
{
    public class Program
    {
        static void Main(string[] args)
        {

            //  String Array with a few default values
            string[] fruitsArray = new string[] { "Apple", "Banana" };

            // Using the .Append() method and converting it back to a string array
            fruitsArray = fruitsArray.Append("Grapes").ToArray();

            // Display values
            foreach (var item in fruitsArray)
            {
                Console.WriteLine(item);
            }
        }

    }
}

Output:

Apple
Banana
Grapes

List to C# Array

If you are good at using List and already using it in your C# Code, then it makes very easy to convert list into C# Array using .ToArray() so you can simply use List, where possible and easily use it's .Add() method to add new elements.

Once we are done with adding items in List, simply convert them in an array.

Example:

using System;
using System.Linq;

namespace PushValuesInArray
{
    public class Program
    {
        public static void Main()
        {
            // New String Array with a few default values
            string[] fruitsArray = new string[] { "Apple", "Banana" };

            // Convert Array To List
            var fruitsList = fruitsArray.ToList();

            // Add Item To List
            fruitsList.Add("Orange");

            // Convert back to List
            fruitsArray = fruitsList.ToArray();

            // Display values
            foreach (var item in fruitsArray)
            {
                Console.WriteLine(item);
            }

        }
    }
}

Output:

Apple
Banana
Orange

That's it, hope it solves your issue.

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