Array.Sort(T) Method (T[], Int32, Int32)

Sorts the elements in a range of elements in an Array using the IComparable(T) generic interface implementation of each element of the Array.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

JScript does not support generic types or methods.

Type Parameters

T

The type of the elements of the array.

Parameters

array
Type: T[]

The one-dimensional, zero-based Array to sort

index
Type: System.Int32

The starting index of the range to sort.

length
Type: System.Int32

The number of elements in the range to sort.

ExceptionCondition
ArgumentNullException

array is a null reference (Nothing in Visual Basic).

ArgumentOutOfRangeException

index is less than the lower bound of array.

-or-

length is less than zero.

ArgumentException

index and length do not specify a valid range in array.

InvalidOperationException

One or more elements in array do not implement the IComparable(T) generic interface.

Each element within the specified range of elements in array must implement the IComparable(T) generic interface to be capable of comparisons with every other element in array.

If the sort is not successfully completed, the results are undefined.

This method uses the QuickSort algorithm. This implementation performs an unstable sort; that is, if two elements are equal, their order might not be preserved. In contrast, a stable sort preserves the order of elements that are equal.

On average, this method is an O(n log n) operation, where n is length; in the worst case it is an O(n ^ 2) operation.

The following code example demonstrates the Sort(T)(T[], Int32, Int32) generic method overload and the Sort(TKey, TValue)(TKey[], TValue[], Int32, Int32, IComparer(TKey)) generic method overload for sorting a range in an array.

The code example defines an alternative comparer for strings, named ReverseCompare, which implements the IComparer<string> (IComparer(Of String) in Visual Basic, IComparer<String^> in Visual C++) generic interface. The comparer calls the CompareTo(String) method, reversing the order of the comparands so that the strings sort high-to-low instead of low-to-high.

The code example creates and displays an array of dinosaur names, consisting of three herbivores followed by three carnivores (tyrannosaurids, to be precise). The Sort(T)(T[], Int32, Int32) generic method overload is used to sort the last three elements of the array, which is then displayed. The Sort(TKey, TValue)(TKey[], TValue[], Int32, Int32, IComparer(TKey)) generic method overload is used with ReverseCompare to sort the last three elements in reverse order. The thoroughly confused dinosaurs are displayed again.

NoteNote:

The calls to the Sort(T)(T[], IComparer(T)) and BinarySearch(T)(T[], T, IComparer(T)) generic methods do not look any different from calls to their nongeneric counterparts, because Visual Basic, C#, and C++ infer the type of the generic type parameter from the type of the first argument. If you use the MSIL Disassembler (Ildasm.exe) to examine the Microsoft intermediate language (MSIL), you can see that the generic methods are being called.

No code example is currently available or this language may not be supported.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0
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