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Array Expressions

Besides being an efficient storage construct, arrays have additional functionality that helps make programs more expressive and powerful. The following example shows one such capability:

string[] weekDays = new string[7];
Console.WriteLine("Number of Days: {0}", 
    weekDays.Length); // Number of Days: 7

For C++ Programmers

From the perspective of traditional built-into-the-language arrays, C++ arrays are simply a pointer to a block of memory. This refers to the C++ arrays derived from its C language ancestry. C# arrays have much more functionality.

The C++ STL array class is similar to the C# ArrayList collection class. Both are library classes.

The previous example showed the array's Length property. The array type has many more methods and properties, as shown in Table 3.2.

Table 3.2  C# Array Members

Method/Property

Description

AsList

Returns an Ilist representation of the array

BinarySearch

Finds a value in a one-dimensional array using a binary search

Clear

Cleans out a range of array values by setting them to 0 or null

Copy

Copies a range of array elements to another array

CreateInstance

Creates a new instance of an array

IndexOf

Finds the first occurrence of a value and returns its index

LastIndexOf

Finds the last occurrence of a value and returns its index

Reverse

Reverses the elements of a one-dimensional array

Sort

Sorts a one-dimensional array

IsReadOnly

Returns true if read-only

IsSynchronized

Returns true if synchronized

Length

Returns the number of elements in all dimensions

Rank

Returns the number of dimensions

SyncRoot

Returns array synchronization object

Clone

Performs a shallow copy

CopyTo

Copies from one array to another

Equals

Compares array references for equality

GetEnumerator

Returns an IEnumerator of a one-dimensional array

GetHashCode

Returns a unique identifier

GetLength

Returns the number of elements in specified dimension

GetLowerBound

Returns the lower bound of a dimension

GetType

Returns the Type object

GetUpperBound

Returns the upper bound of a dimension

GetValue

Returns values from specified elements

Initialize

Calls the default constructor of each element

SetValue

Sets values of specified elements

ToString

Returns a string representation

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