System.Collections Namespace

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

The IHashCodeProvider interface is used in conjunction with Hashtable.

The objects used as keys by a Hashtable must implement or inherit 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 of that implementation is used as the hash code provider.
• If an IComparer implementation is passed to the constructor, the IComparer.Compare of that implementation is used as the comparer.

Hashtable Class   IComparer Interface