How to convert a two-dimensional array to one-dimensional array in C#

In this article, I am going to discuss how to convert a two-dimensional array to a one-dimensional array in C# with some examples. Please read our previous article where we discussed How to Find All Possible Substring of a Given String in C# with some examples. As part of this article, we will discuss the following two approaches.

1. How to convert a 2d array into 1d array column-wise in C#?
2. How to convert a 2d array into 1d array row-wise in C#?

Program Description:
Here, the user will input a two-dimensional array (i.e. matrix) and we need to convert that 2D array to a one-dimensional array. Here, we will create the one-dimensional array row-wise as well as column-wise. For better understanding please have a look at the following diagram.

Creating a 1D Array from 2D Array Column Wise in C#:
The following program is self-explained. So, please go through the comment lines for better understanding. In the following example, we convert the 2d array to 1d array column-wise.

using System;
namespace LogicalPrograms
{
    class Program
    {
        static void Main(string[] args)
        {
            //Creating a 2d Array with 2 rows and three columns
            int[,] int2DArray = new int[2, 3];
            Console.Write("Enter 2D Array Elements : ");
            for (int i = 0; i < 2; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    int2DArray[i, j] = Convert.ToInt32(Console.ReadLine());
                }
            }
            int index = 0;
            //Getting the no of rows of 2d array 
            int NoOfRows = int2DArray.GetLength(0);
            //Getting the no of columns of the 2d array
            int NoOfColumns = int2DArray.GetLength(1);
            //Creating 1d Array by multiplying NoOfRows and NoOfColumns
            int[] OneDimensionalArray = new int[NoOfRows * NoOfColumns];
            
            //Assigning the elements to 1d Array from 2d array
            for (int y = 0; y < NoOfColumns; y++)
            {
                for (int x = 0; x < NoOfRows ; x++)
                {
                    OneDimensionalArray[index] = int2DArray[x, y];
                    index++;
                }
            }
            //Printing the 1d array elements
            Console.WriteLine("1D Array Elements : ");
            foreach (int item in OneDimensionalArray)
            {
                Console.Write(item + " ");
            }
            Console.ReadKey();
        }
    }
}

Output:

Creating the 1D Array From 2D Array Row Wise in C#:
In the following program, we convert the two-dimensional array to one-dimensional row-wise. For better understanding please go through the comment lines.

using System.Linq;
using System;
namespace LogicalPrograms
{
    class Program
    {
        static void Main(string[] args)
        {
            //Creating a 2d Array with 2 rows and three columns
            int[,] int2DArray = new int[2, 3];
            Console.Write("Enter 2D Array Elements : ");
            for (int i = 0; i < 2; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    int2DArray[i, j] = Convert.ToInt32(Console.ReadLine());
                }
            }
            int index = 0;
            //Getting the no of rows of 2d array 
            int NoOfRows = int2DArray.GetLength(0);
            //Getting the no of columns of the 2d array
            int NoOfColumns = int2DArray.GetLength(1);
            //Creating 1d Array by multiplying NoOfRows and NoOfColumns
            int[] OneDimensionalArray = new int[NoOfRows * NoOfColumns];
            
            //Assigning the elements to 1d Array from 2d array
            for (int y = 0; y < NoOfRows ; y++)
            {
                for (int x = 0; x < NoOfColumns; x++)
                {
                    OneDimensionalArray[index] = int2DArray[y, x];
                    index++;
                }
            }
            //Printing the 1d array elements
            Console.WriteLine("1D Array Elements : ");
            foreach (int item in OneDimensionalArray)
            {
                Console.Write(item + " ");
            }
            Console.ReadKey();
        }
    }
}

Output:

In the next article, I am going to discuss how to convert a one-dimensional array to a two-dimensional array in C# with examples. I hope now you understood how to convert a two-dimensional array to a one-dimensional array in C# with different mechanisms.

Summary:
I hope this post will be helpful to understand How to convert a two-dimensional array to one-dimensional array in C#
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