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Array Methods and Properties

1. Properties​

Length​

The Length property gets the total number of elements in all dimensions of the array.

int[] numbers = { 10, 20, 30, 40, 50 };
int length = numbers.Length; // length = 5

Rank​

The Rank property gets the number of dimensions (or rank) of the array.

int[,] matrix = new int[3, 5];
int rank = matrix.Rank; // rank = 2

2. Methods​

GetValue and SetValue​

The GetValue method retrieves the value at a specific position in the array, and the SetValue method sets a value at a specific position in the array.

int[] numbers = { 10, 20, 30, 40, 50 };

int value = (int) numbers.GetValue(2); // value = 30
numbers.SetValue(100, 2); // numbers[2] = 100

CopyTo​

The CopyTo method copies all the elements of the current array into a specified array, starting at a specific index.

int[] sourceArray = { 1, 2, 3 };
int[] destinationArray = new int[5];
sourceArray.CopyTo(destinationArray, 2);
// destinationArray = { 0, 0, 1, 2, 3 }

Clone​

The Clone method creates a shallow copy of the array.

int[] numbers = { 10, 20, 30 };
int[] clonedArray = (int[]) numbers.Clone();

Sort​

The Sort method sorts the elements in a one-dimensional array.

int[] numbers = { 30, 10, 20 };
Array.Sort(numbers); // numbers = { 10, 20, 30 }

Reverse​

The Reverse method reverses the order of the elements in a one-dimensional array.

int[] numbers = { 30, 10, 20 };
Array.Reverse(numbers); // numbers = { 30, 20, 10 }

IndexOf​

The IndexOf method returns the index of the first occurrence of a value in a one-dimensional array.

int[] numbers = { 10, 20, 30 };
int index = Array.IndexOf(numbers, 20); // index = 1

Find​

The Find method returns the first element that satisfies the conditions defined by a specified predicate.

int[] numbers = { 10, 20, 30 };
int result = Array.Find(numbers, element => element > 15); // result = 20

FindAll​

The FindAll method returns all elements that satisfy the conditions defined by a specified predicate.

int[] numbers = { 10, 20, 30, 40 };
int[] results = Array.FindAll(numbers, element => element > 15); // results = { 20, 30, 40 }