HashSet(T) Class (System.Collections.Generic)

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

Microsoft Visual Studio 2010/.NET Framework 4.0

.NET Framework Class Library

HashSet<(Of <(T>)>) Class

Represents a set of values.

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

Syntax

Visual Basic (Declaration)

<SerializableAttribute> _
<HostProtectionAttribute(SecurityAction.LinkDemand, MayLeakOnAbort := True)> _
Public Class HashSet(Of T) _
    Implements ICollection(Of T), IEnumerable(Of T),  _
    IEnumerable, ISerializable, IDeserializationCallback

Visual Basic (Usage)

Dim instance As HashSet(Of T)

[SerializableAttribute]
[HostProtectionAttribute(SecurityAction.LinkDemand, MayLeakOnAbort = true)]
public class HashSet<T> : ICollection<T>, IEnumerable<T>, 
    IEnumerable, ISerializable, IDeserializationCallback

Visual C++

[SerializableAttribute]
[HostProtectionAttribute(SecurityAction::LinkDemand, MayLeakOnAbort = true)]
generic<typename T>
public ref class HashSet : ICollection<T>, 
    IEnumerable<T>, IEnumerable, ISerializable, IDeserializationCallback

JScript

JScript does not support generic types or methods.

Type Parameters

T: The type of elements in the hast set.

Remarks

Note:
The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: MayLeakOnAbort. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

Note:

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: MayLeakOnAbort. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

The HashSet<(Of <(T>)>) class provides high performance set operations. A set is a collection that contains no duplicate elements, and whose elements are in no particular order.

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

Inheritance Hierarchy

System..::.Object
System.Collections.Generic..::.HashSet<(Of <(T>)>)

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.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

Version Information

.NET Framework

Supported in: 3.5

Reference

HashSet<(Of <(T>)>) Members

System.Collections.Generic Namespace

Other Resources

HashSet and LINQ Set Operations

HashSet Collection Type