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IHashCodeProvider Interface

 
System_CAPS_noteNote

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obsoleteCodeEntityT:System.Collections.IEqualityComparerNote: 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)

<ObsoleteAttribute("Please use IEqualityComparer instead.")>
<ComVisibleAttribute(True)>
Public Interface IHashCodeProvider
Name Description
System_CAPS_pubmethod GetHashCode(Object)

Returns a hash code for the specified object.

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
Available since 1.1
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