IEqualityComparer Interface

Definition

Namespace:

System.Collections

Assembly:

System.Runtime.dll

Defines methods to support the comparison of objects for equality.

public interface class IEqualityComparer

public interface IEqualityComparer

type IEqualityComparer = interface

Public Interface IEqualityComparer

Derived

System.Collections.Generic.EqualityComparer<T>

System.Collections.Generic.ReferenceEqualityComparer

System.StringComparer

System.Xml.Linq.XNodeEqualityComparer

Remarks

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.

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

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

Methods

Equals(Object, Object)	Determines whether the specified objects are equal.
GetHashCode(Object)	Returns a hash code for the specified object.

See also

• Hashtable
• NameValueCollection
• OrderedDictionary
• IComparer