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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 2.

Table 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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