IHashCodeProvider Interface (System.Collections)

.NET Framework Class Library

IHashCodeProvider Interface

Note: This API is now obsolete. The non-obsolete alternative is IEqualityComparer.

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

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

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

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

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

[<ObsoleteAttribute("Please use IEqualityComparer instead.")>]
[<ComVisibleAttribute(true)>]
type IHashCodeProvider =  interface end

The IHashCodeProvider type exposes the following members.

Methods

	Name	Description
	GetHashCode	Returns a hash code for the specified object.

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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.

Version Information

.NET Framework

Supported in: 1.1, 1.0
Obsolete (compiler warning) in 4
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 3.0 SP2
Obsolete (compiler warning) in 2.0
Obsolete (compiler warning) in 2.0 SP1
Obsolete (compiler warning) in 2.0 SP2

.NET Framework Client Profile

Obsolete (compiler warning) in 4
Obsolete (compiler warning) in 3.5 SP1

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

Reference

System.Collections Namespace

Hashtable

IHashCodeProvider

IComparer

CaseInsensitiveHashCodeProvider

IEqualityComparer

System.Collections.Generic..::.IEqualityComparer<(Of <(T>)>)