This documentation is archived and is not being maintained.

HashSet<T> Constructor (IEqualityComparer<T>)

Initializes a new instance of the HashSet<T> class that is empty and uses the specified equality comparer for the set type.

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

public HashSet(
	IEqualityComparer<T> comparer


Type: System.Collections.Generic.IEqualityComparer<T>
The IEqualityComparer<T> implementation to use when comparing values in the set, or null to use the default EqualityComparer<T> implementation for the set type.

The capacity of a HashSet<T> object is the number of elements that the object can hold. A HashSet<T> object's capacity automatically increases as elements are added to the object.

This constructor is an O(1) operation.

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.