IHashCodeProvider Interface (System.Collections)

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

IHashCodeProvider Interface

Updated: November 2007

NOTE: This API is now obsolete.

Supplies a hash code for an object, using a custom hash function.

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

Syntax

Visual Basic (Declaration)

<ObsoleteAttribute("Please use IEqualityComparer instead.")> _
<ComVisibleAttribute(True)> _
Public Interface IHashCodeProvider

Visual Basic (Usage)

Dim instance As IHashCodeProvider

[ObsoleteAttribute("Please use IEqualityComparer instead.")]
[ComVisibleAttribute(true)]
public interface IHashCodeProvider

Visual C++

[ObsoleteAttribute(L"Please use IEqualityComparer instead.")]
[ComVisibleAttribute(true)]
public interface class IHashCodeProvider

/** @attribute ObsoleteAttribute("Please use IEqualityComparer instead.") */
/** @attribute ComVisibleAttribute(true) */
public interface IHashCodeProvider

JScript

public interface IHashCodeProvider

Remarks

The IHashCodeProvider interface is used in conjunction with the Hashtable class. The objects used as keys by a Hashtable object must override the Object..::.GetHashCode and Object..::.Equals methods. Object..::.GetHashCode or the key's implementation of Object..::.GetHashCode is used as the hash code provider. Object..::.Equals or the key's implementation of Object..::.Equals is used as the comparer.

However, some overloads of the Hashtable constructor take a parameter that is an IHashCodeProvider implementation, or a parameter that is an IComparer implementation, or both. If an IHashCodeProvider implementation is passed to the constructor, the IHashCodeProvider..::.GetHashCode method of that implementation is used as the hash code provider. If an IComparer implementation is passed to the constructor, the IComparer..::.Compare method of that implementation is used as the comparer.

Platforms

Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, 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

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.

Version Information

.NET Framework

Supported in: 1.1, 1.0
Obsolete (compiler warning) in 3.5
Obsolete (compiler warning) in 3.5 SP1
Obsolete (compiler warning) in 3.0
Obsolete (compiler warning) in 3.0 SP1
Obsolete (compiler warning) in 2.0
Obsolete (compiler warning) in 2.0 SP1