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.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

The IHashCodeProvider type exposes the following members.

  Name Description
Public method Supported by the XNA Framework GetHashCode Returns a hash code for the specified object.
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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.

.NET Framework

Supported in: 1.1
Obsolete (compiler warning) in 4.6
Obsolete (compiler warning) in 4.6
Obsolete (compiler warning) in 4.5
Obsolete (compiler warning) in 4.5.1
Obsolete (compiler warning) in 4.5.2
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

XNA Framework

Obsolete (compiler warning) in 3.0
Obsolete (compiler warning) in 2.0
Obsolete (compiler warning) in 1.0