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<Type Name="IHashCodeProvider" FullName="System.Collections.IHashCodeProvider" FullNameSP="System_Collections_IHashCodeProvider" Maintainer="ecma">
<TypeSignature Language="ILASM" Value=".class interface public abstract IHashCodeProvider" />
<TypeSignature Language="C#" Value="public interface IHashCodeProvider" />
<MemberOfLibrary>BCL</MemberOfLibrary>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyPublicKey>[00 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00 ]</AssemblyPublicKey>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>
<para> Implemented by classes that support custom hash functions for instances of the class.</para>
</summary>
<remarks>
<para>
<block subset="none" type="note">
<see cref="T:System.Collections.IHashCodeProvider" /> contains the <see cref="M:System.Collections.IHashCodeProvider.GetHashCode(System.Object)" /> method. The consumer of an
object should call this method to obtain a hash code for the object using a
custom hash function.</block>
</para>
</remarks>
</Docs>
<Members>
<Member MemberName="GetHashCode">
<MemberSignature Language="ILASM" Value=".method public hidebysig virtual abstract int32 GetHashCode(object obj)" />
<MemberSignature Language="C#" Value="public int GetHashCode (object obj);" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Int32</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="obj" Type="System.Object" />
</Parameters>
<Docs>
<param name="obj">The <see cref="T:System.Object" /> for which a hash code is to be generated.</param>
<summary>
<para>Generates a hash code for the specified <see cref="T:System.Object" />.</para>
</summary>
<returns>
<para>A <see cref="T:System.Int32" /> containing the hash code for the specified <see cref="T:System.Object" />.</para>
</returns>
<remarks>
<para>
<block subset="none" type="behaviors">If <paramref name="obj" /> is <see langword="null" />, it is required that a call to
<see cref="M:System.Collections.IHashCodeProvider.GetHashCode(System.Object)" /> throw <see cref="T:System.ArgumentNullException" />.</block>
</para>
<para>
<block subset="none" type="overrides">Implement
this method to generate a better hash table
distribution than the default method provided by the type of the <see cref="T:System.Object" /> for which the hash code is
being generated.</block>
</para>
<para>
<block subset="none" type="usage">The value returned by this method
should not be persisted past the lifetime of the application that created the
value. The first reason is that the hash function of a class might be
altered to generate a better distribution, rendering any values from the old
hash function useless. The second reason is that the default
implementation of this class does not guarantee that the same value will be
returned by different instances.</block>
</para>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="obj " /> is <see langword="null" />.</exception>
</Docs>
<Excluded>0</Excluded>
<AssemblyInfo>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
</AssemblyInfo>
</Member>
</Members>
<TypeExcluded>0</TypeExcluded>
<Interfaces />
<Attributes>
<Attribute>
<AttributeName>System.Runtime.InteropServices.ComVisible(true)</AttributeName>
</Attribute>
<Attribute>
<AttributeName>System.Obsolete("Please use IEqualityComparer instead.")</AttributeName>
</Attribute>
</Attributes>
</Type>
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