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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 |