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Array Collection in ASP.Net C#

Array is a collection of similar data type. It contains the fixed length with same data type.

int[] arr=new int[10]; // One dimension
Here the int array contains the 10 item, item starting from 0 to 9.

Array indexing is start with zero (0th- position) and the last position is total minus one (Total no of array -1). 

But dynamic array not have predefined size. It dynamically manages the size when you add the item in the list.

Types of Arrays
  1. One-dimensional Arrays 
  2. Two-dimensional Arrays 
  3. Jagged Arrays 
  4. Mixed Arrays 

1. One-dimensional Arrays

double[] doubleArray = new double[15];
char[] charArr = new char[15];
bool[] boolArr = new bool[20];
string[] stringArr = new string[100];

Array Properties
  1. IsFixedSize => Return a value indicating if an array has a fixed size or not. 
  2. IsReadOnly => Return a value indicating if an array is read-only or not. 
  3. LongLength => Return a 64-bit integer that represents total number of items in all the dimensions of an array. 
  4. Length => Return a 32-bit integer that represents the total number of items in all the dimensions of an array. 
  5. Rank => Return the number of dimensions of an array . 
Example as given below.


namespace Array
{
    public static class ArrayClass
    {
        public static void ArrayMethod()
        {
            int[] arr = new int[10];
            if (arr.IsFixedSize)
            {
                Console.WriteLine("Array Length : " + arr.Length.ToString());
                Console.WriteLine("Array dimensions : " + arr.Rank.ToString());
                Console.WriteLine("Array Length : " + arr.IsReadOnly.ToString());
            }
        }
    }
    public class Program
    {
        static void Main(string[] args)
        {
            ArrayClass.ArrayMethod();
            Console.ReadLine();
        }
    }
}  

The Output as given below

 Array Length : 10
 Array dimensions : 1
 Array Length : False
==============================================
2. Two-Dimensional Arrays

Arrays Example

namespace Array
{
    public static class ArrayClass
    {
        public static void ArrayMethod()
        {
            string[,] name = new string[2, 2] { { "Anil", "MCA" }, { "Deepak", "B.Tech." } };
            if (name.Length > 0)
            {
                DataTable dt = new DataTable();
                dt.Columns.Add("Name");
                dt.Columns.Add("Education");
                Console.Write(dt.Columns[0].ColumnName.ToString());
                Console.Write(" ");
                Console.WriteLine(dt.Columns[1].ColumnName.ToString());
                for (int i = 0; i < name.GetLength(0); i++)
                {
                    dt.Rows.Add();
                    dt.Rows[i]["Name"] = name[i, 0].ToString();
                    dt.Rows[i]["Education"] = name[i, 1].ToString();
                    Console.Write(dt.Rows[i]["Name"]);
                    Console.Write(" ");
                    Console.WriteLine(dt.Rows[i]["Education"]);
                }
            }
        }
    }
    public class Program
    {
        static void Main(string[] args)
        {
            ArrayClass.ArrayMethod();
            Console.ReadLine();
        }
    }
}    
         
The OutPut as given below.
               
Name     Education

Anil       MCA
Deepak     B. Tech.
========================================

3. Jagged Arrays

A jagged array is an array of arrays. The elements of jagged array can be different dimensions and different sizes.

Example of Jagged Arrays

using System;
Public class jaggedArrayProgram
{
            static void Main()
            {
            // First we declare local jagged array with 3 rows.
            int[][] jaggedArray = new int[3][];
           
            // Create a new array in the jagged array, and assign it.
            jaggedArray [0] = new int[2];
            jaggedArray [0][0] = 1;
            jaggedArray [0][1] = 2;
           
            // Set the second row, initialized to zero.
            jaggedArray [1] = new int[1];
           
            // Set the third row, using array initializer.
            jaggedArray [2] = new int[3] { 3, 4, 5 };
           
            // Print out to all the elements in the jagged array.
            for (int i = 0; i < jaggedArray.Length; i++)
            {
                        int[] innerJaggedArray = jaggedArray[i];
                        for (int x = 0; x < innerJaggedArray.Length; x++)
                        {
                        Console.Write(innerJaggedArray[x] + " ");
                        }
                        Console.WriteLine();
            }
            }
}

The OutPut as given below.

"1 2"
"0"
"3 4 5"

10.2
20.20
Sum Of Two :  30.4
=====================================

Initializing at the time of declaration

using System;                          
namespace JaggedArray
{
            public class Array
            {
                        static void Main(string[] args)
                        {
                                    //Declaration and initializations both at the time
                                    int[][] arrObj = new int[][]{
                                                new int[]{2,4,6},
                                                new int[]{1,3}
                                    };

                                    //Each elements of jagged array are printed here
                                    for (int i = 0; i < arrObj.Length; i++)
                                    {
                                                for (int j = 0; j < arrObj[i].Length; j++)
                                                {
                                                            Console.Write("{0} ", arrObj[i][j]);
                                                }
                                                Console.WriteLine();
                                    }
                                    Console.Read();                                               
                        }
            }
}

The OutPut as given below.

2 4 6 
1 3

============================================

4. Mixed Arrays

Mixed arrays is combination of multidimensional arrays and jagged arrays. But think mixed arrays type is removed from .NET 4.0.

Array [][] = {{'x',1},{'y',2},{'z',3}};



By Anil Singh | Rating of this article (*****)

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