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ArrayList.Sort Method (IComparer)

Updated: October 2008

Sorts the elements in the entire ArrayList using the specified comparer.

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

public function Sort(
	comparer : IComparer
)

Parameters

comparer
Type: System.Collections.IComparer

The IComparer implementation to use when comparing elements.

-or-

a null reference (Nothing in Visual Basic) to use the IComparable implementation of each element.

ExceptionCondition
NotSupportedException

The ArrayList is read-only.

If comparer is set to a null reference (Nothing in Visual Basic), this method performs a comparison sort (also called 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. To perform a stable sort, you must implement a custom IComparer interface.

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

The following code example shows how to sort the values in an ArrayList using the default comparer and a custom comparer that reverses the sort order.

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, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

October 2008

Revised the Remarks section to note that the QuickSort algorithm is a comparison sort.

Information enhancement.

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