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.NET Framework Class Library

IEqualityComparer Interface

Defines methods to support the comparison of objects for equality.

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)
<ComVisibleAttribute(True)> _
Public Interface IEqualityComparer

The IEqualityComparer type exposes the following members.

  Name Description
Public method Supported by the XNA Framework Supported by Portable Class Library Equals Determines whether the specified objects are equal.
Public method Supported by the XNA Framework Supported by Portable Class Library GetHashCode Returns a hash code for the specified object.
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This interface allows the implementation of customized equality comparison for collections. That is, you can create your own definition of equality, and specify that this definition be used with a collection type that accepts the IEqualityComparer interface. In the .NET Framework, constructors of the Hashtable, NameValueCollection, and OrderedDictionary collection types accept this interface.

This interface supports only equality comparisons. Customization of comparisons for sorting and ordering is provided by the IComparer interface.

For the generic version of this interface, see System.Collections.Generic.IEqualityComparer<T>.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library