Array Methods

Although you’ve been using arrays as built-in types throughout this chapter, an array is actually an object of type System.Array .[7] Arrays in C# thus provide you with the best of both worlds: easy-to-use syntax underpinned with an actual class definition so that instances of an array have access to the methods and properties of System.Array. You’ve seen the Length property of arrays used several times already. Some of the other important methods and properties appear in Table 10-1.

Table 10-1. System.Array methods and properties

Method or property

Purpose

BinarySearch( )

Overloaded public static method that searches a one-dimensional sorted array

Clear( )

Public static method that sets a range of elements in the array either to zero or to a null reference

Copy( )

Overloaded public static method that copies a section of one array to another array

CreateInstance ( )

Overloaded public static method that instantiates a new instance of an array

IndexOf( )

Overloaded public static method that returns the index (offset) of the first instance of a value in a one-dimensional array

LastIndexOf( )

Overloaded public static method that returns the index of the last instance of a value in a one-dimensional array

Reverse( )

Overloaded public static method that reverses the order of the elements in a one-dimensional array

Sort( )

Overloaded public static method that sorts the values in a one-dimensional array

Length

Public property that returns the length of the array

GetEnumerator( )

Public method that returns an IEnumerator


[7] Of course, when you create an array with int[] myArray = new int[5], what you actually create in the IL code is an instance of System.int32[]. Because this derives from the Abstract Base Class System.Array, however, it is fair to say you’ve created an instance of a System.Array.

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