C# - Array Class

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An array is a collection of elements of the same data types in a contiguous memory location. In C#, the Array class provides a variety of methods and properties for creating, manipulating, searching, and sorting arrays −

Properties of the Array Class

The following table describes some of the most commonly used properties of C# Array class −

Sr.No. Property & description
1

IsFixedSize

Gets a value indicating whether the Array has a fixed size.
2

IsReadOnly

Gets a value indicating whether the Array is read-only.
3

Length

Gets a 32-bit integer that represents the total number of elements in all the dimensions of the Array.
4

LongLength

Gets a 64-bit integer that represents the total number of elements in all the dimensions of the Array.
5

Rank

Gets the rank (number of dimensions) of the Array.

Methods of the Array Class

The following table describes some of the most commonly used methods of the Array class −

Sr.No. Methods & Description
1 AsReadOnly<T>():

It returns a read-only wrapper for the specified array.
2 BinarySearch()

It searches a sorted array for a value.
3 Clear()

It sets a range of elements in the Array to zero, to false, or to null, depending on the element type.
4 Clone()

It creates a shallow copy of the array.
5 ConstrainedCopy()

It copies a range of elements from one array to another.
6 ConvertAll<TInput,TOutput>()

It converts an array of one type to another type using a specified converter
7 CopyTo()

It copies all elements of the array to another array, starting at a specified index.
8 Copy()

It copies a range of elements in one array to another and performs typecasting and boxing.
9 CreateInstance()

It creates an array of a specified type and dimension lengths.
10 Empty<T>()

It returns an empty array of type T.
11 Exists<T>()

It determines whether the array contains elements.
12 Fill<T>()

It fills the entire array with the specified value.
13 FindIndex<T>()

It returns an index defined by the specified predicate.
14 Find<T>()

It searches for an element that matches the conditions.

15 ForEach<T>()

It performs the specified action on each element of the array.
16 GetLength()

It gets a 32-bit integer that represents the number of elements in the specified dimension of the Array..

17 GetUpperBound()

It gets the index of the last element of the specified dimension in the array.

18 IndexOf()

It searches for a specified element in the array and returns its index.

19 LastIndexOf()

It return the index of the last occurrence of specified element.

20 Resize<T>()

It changes the size of a one-dimensional array to a specified size.

21 Reverse()

It reverses the sequence of elements in the entire array or a subset of it.

22 SetValue()

It sets a value to a specific element in an array at a given position.

23 Sort()

It sorts the element in the array.

24 TrueForAll<T>()

It checks whether all elements in array match the condition.

In this chapter, we have summarized key methods that are commonly used in C# programming. For complete list of Array class properties and methods, please visit the Microsoft documentation on C# −

Example C# Array Class Methods

The following program demonstrates use of some of the methods of the Array class −

using System;
namespace ArrayApplication {
   class MyArray {
      static void Main(string[] args) {
         int[] list = { 34, 72, 13, 44, 25, 30, 10 };
         int[] temp = list;
         Console.Write("Original Array: ");
         
         foreach (int i in list) {
            Console.Write(i + " ");
         }
         Console.WriteLine();
         
         // reverse the array
         Array.Reverse(temp);
         Console.Write("Reversed Array: ");
         
         foreach (int i in temp) {
            Console.Write(i + " ");
         }
         Console.WriteLine();
         
         //sort the array
         Array.Sort(list);
         Console.Write("Sorted Array: ");
         
         foreach (int i in list) {
            Console.Write(i + " ");
         }
         Console.WriteLine();
         Console.ReadKey();
      }
   }
}

When the above code is compiled and executed, it produces the following result −

Original Array: 34 72 13 44 25 30 10
Reversed Array: 10 30 25 44 13 72 34
Sorted Array: 10 13 25 30 34 44 72
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