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11/18/2011

EqualityComparer<T> Class

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Provides a base class for implementations of the IEqualityComparer<T> generic interface.

Inheritance Hierarchy

System.Object
System.Collections.Generic.EqualityComparer<T>

Namespace: System.Collections.Generic
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public MustInherit Class EqualityComparer(Of T) _
    Implements IEqualityComparer, IEqualityComparer(Of T)

public abstract class EqualityComparer<T> : IEqualityComparer, 
    IEqualityComparer<T>

Type Parameters

T
The type of objects to compare.

The EqualityComparer<T> type exposes the following members.

Constructors

	Name	Description
	EqualityComparer<T>	Initializes a new instance of the EqualityComparer<T> class.

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Properties

	Name	Description
	Default	Returns a default equality comparer for the type specified by the generic argument.

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Methods

	Name	Description
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Equals(T, T)	When overridden in a derived class, determines whether two objects of type T are equal.
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode()	Serves as a hash function for a particular type. (Inherited from Object.)
	GetHashCode(T)	When overridden in a derived class, serves as a hash function for the specified object for hashing algorithms and data structures, such as a hash table.
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Explicit Interface Implementations

	Name	Description
	IEqualityComparer.Equals	Determines whether the specified objects are equal.
	IEqualityComparer.GetHashCode	Returns a hash code for the specified object.

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Remarks

Derive from this class to provide a custom implementation of the IEqualityComparer<T> generic interface for use with collection classes such as the Dictionary<TKey, TValue> generic class, or with methods such as List<T>.Sort.

The Default property checks whether type T implements the System.IEquatable<T> generic interface and if so returns an EqualityComparer<T> that uses that implementation. Otherwise it returns an EqualityComparer<T> that uses the overrides of Object.Equals and Object.GetHashCode provided by T.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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