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HashSet`1.xml
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HashSet`1.xml
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<Type Name="HashSet<T>" FullName="System.Collections.Generic.HashSet<T>">
<TypeSignature Language="C#" Value="public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.Generic.ISet<T>" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.3;netstandard-1.4;netstandard-1.6" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit HashSet`1<T> extends System.Object implements class System.Collections.Generic.ICollection`1<!T>, class System.Collections.Generic.IEnumerable`1<!T>, class System.Collections.Generic.IReadOnlyCollection`1<!T>, class System.Collections.Generic.ISet`1<!T>, class System.Collections.IEnumerable" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.3;netstandard-1.4;netstandard-1.6" />
<TypeSignature Language="DocId" Value="T:System.Collections.Generic.HashSet`1" />
<TypeSignature Language="VB.NET" Value="Public Class HashSet(Of T)
Implements ICollection(Of T), IEnumerable(Of T), IReadOnlyCollection(Of T), ISet(Of T)" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.3;netstandard-1.4;netstandard-1.6" />
<TypeSignature Language="F#" Value="type HashSet<'T> = class
 interface ICollection<'T>
 interface seq<'T>
 interface IEnumerable
 interface IReadOnlyCollection<'T>
 interface ISet<'T>" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.3;netstandard-1.4;netstandard-1.6" />
<TypeSignature Language="C++ CLI" Value="generic <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::IReadOnlyCollection<T>, System::Collections::Generic::ISet<T>" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.3;netstandard-1.4;netstandard-1.6" />
<TypeSignature Language="C#" Value="public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.Generic.IReadOnlySet<T>, System.Collections.Generic.ISet<T>, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit HashSet`1<T> extends System.Object implements class System.Collections.Generic.ICollection`1<!T>, class System.Collections.Generic.IEnumerable`1<!T>, class System.Collections.Generic.IReadOnlyCollection`1<!T>, class System.Collections.Generic.IReadOnlySet`1<!T>, class System.Collections.Generic.ISet`1<!T>, class System.Collections.IEnumerable, class System.Runtime.Serialization.IDeserializationCallback, class System.Runtime.Serialization.ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
<TypeSignature Language="VB.NET" Value="Public Class HashSet(Of T)
Implements ICollection(Of T), IDeserializationCallback, IEnumerable(Of T), IReadOnlyCollection(Of T), IReadOnlySet(Of T), ISerializable, ISet(Of T)" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
<TypeSignature Language="F#" Value="type HashSet<'T> = class
 interface ICollection<'T>
 interface seq<'T>
 interface IEnumerable
 interface IReadOnlyCollection<'T>
 interface ISet<'T>
 interface IReadOnlySet<'T>
 interface IDeserializationCallback
 interface ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
<TypeSignature Language="C++ CLI" Value="generic <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::IReadOnlyCollection<T>, System::Collections::Generic::IReadOnlySet<T>, System::Collections::Generic::ISet<T>, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
<TypeSignature Language="C#" Value="public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.Generic.ISet<T>, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializable" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit HashSet`1<T> extends System.Object implements class System.Collections.Generic.ICollection`1<!T>, class System.Collections.Generic.IEnumerable`1<!T>, class System.Collections.Generic.IReadOnlyCollection`1<!T>, class System.Collections.Generic.ISet`1<!T>, class System.Collections.IEnumerable, class System.Runtime.Serialization.IDeserializationCallback, class System.Runtime.Serialization.ISerializable" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="VB.NET" Value="Public Class HashSet(Of T)
Implements ICollection(Of T), IDeserializationCallback, IEnumerable(Of T), IReadOnlyCollection(Of T), ISerializable, ISet(Of T)" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="F#" Value="type HashSet<'T> = class
 interface ICollection<'T>
 interface seq<'T>
 interface IEnumerable
 interface IReadOnlyCollection<'T>
 interface ISet<'T>
 interface IDeserializationCallback
 interface ISerializable" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="C++ CLI" Value="generic <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::IReadOnlyCollection<T>, System::Collections::Generic::ISet<T>, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializable" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="C#" Value="public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializable" FrameworkAlternate="netframework-3.5" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi serializable beforefieldinit HashSet`1<T> extends System.Object implements class System.Collections.Generic.ICollection`1<!T>, class System.Collections.Generic.IEnumerable`1<!T>, class System.Collections.IEnumerable, class System.Runtime.Serialization.IDeserializationCallback, class System.Runtime.Serialization.ISerializable" FrameworkAlternate="netframework-3.5" />
<TypeSignature Language="VB.NET" Value="Public Class HashSet(Of T)
Implements ICollection(Of T), IDeserializationCallback, IEnumerable(Of T), ISerializable" FrameworkAlternate="netframework-3.5" />
<TypeSignature Language="F#" Value="type HashSet<'T> = class
 interface ICollection<'T>
 interface seq<'T>
 interface IEnumerable
 interface ISerializable
 interface IDeserializationCallback" FrameworkAlternate="netframework-3.5" />
<TypeSignature Language="C++ CLI" Value="generic <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializable" FrameworkAlternate="netframework-3.5" />
<TypeSignature Language="C#" Value="public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.ISet<T>, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializable" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi serializable beforefieldinit HashSet`1<T> extends System.Object implements class System.Collections.Generic.ICollection`1<!T>, class System.Collections.Generic.IEnumerable`1<!T>, class System.Collections.Generic.ISet`1<!T>, class System.Collections.IEnumerable, class System.Runtime.Serialization.IDeserializationCallback, class System.Runtime.Serialization.ISerializable" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2" />
<TypeSignature Language="VB.NET" Value="Public Class HashSet(Of T)
Implements ICollection(Of T), IDeserializationCallback, IEnumerable(Of T), ISerializable, ISet(Of T)" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2" />
<TypeSignature Language="F#" Value="type HashSet<'T> = class
 interface ISerializable
 interface IDeserializationCallback
 interface ISet<'T>
 interface ICollection<'T>
 interface seq<'T>
 interface IEnumerable" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2" />
<TypeSignature Language="C++ CLI" Value="generic <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::ISet<T>, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializable" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi serializable beforefieldinit HashSet`1<T> extends System.Object implements class System.Collections.Generic.ICollection`1<!T>, class System.Collections.Generic.IEnumerable`1<!T>, class System.Collections.Generic.IReadOnlyCollection`1<!T>, class System.Collections.Generic.ISet`1<!T>, class System.Collections.IEnumerable, class System.Runtime.Serialization.IDeserializationCallback, class System.Runtime.Serialization.ISerializable" FrameworkAlternate="netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<TypeSignature Language="F#" Value="type HashSet<'T> = class
 interface ICollection<'T>
 interface seq<'T>
 interface IEnumerable
 interface ISerializable
 interface IDeserializationCallback
 interface ISet<'T>
 interface IReadOnlyCollection<'T>" FrameworkAlternate="netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<TypeSignature Language="C#" Value="public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.ISet<T>" FrameworkAlternate="netstandard-1.0;netstandard-1.1;netstandard-1.2" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit HashSet`1<T> extends System.Object implements class System.Collections.Generic.ICollection`1<!T>, class System.Collections.Generic.IEnumerable`1<!T>, class System.Collections.Generic.ISet`1<!T>, class System.Collections.IEnumerable" FrameworkAlternate="netstandard-1.0;netstandard-1.1;netstandard-1.2" />
<TypeSignature Language="VB.NET" Value="Public Class HashSet(Of T)
Implements ICollection(Of T), IEnumerable(Of T), ISet(Of T)" FrameworkAlternate="netstandard-1.0;netstandard-1.1;netstandard-1.2" />
<TypeSignature Language="F#" Value="type HashSet<'T> = class
 interface ISet<'T>
 interface ICollection<'T>
 interface seq<'T>
 interface IEnumerable" FrameworkAlternate="netstandard-1.0;netstandard-1.1;netstandard-1.2" />
<TypeSignature Language="C++ CLI" Value="generic <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::ISet<T>" FrameworkAlternate="netstandard-1.0;netstandard-1.1;netstandard-1.2" />
<AssemblyInfo>
<AssemblyName>System.Collections</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.1.1.0</AssemblyVersion>
<AssemblyVersion>4.1.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Core</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>3.5.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<TypeForwardingChain>
<TypeForwarding From="System.Core" FromVersion="4.0.0.0" To="System.Collections" ToVersion="0.0.0.0" FrameworkAlternate="dotnet-uwp-10.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Collections" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Collections" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Collections" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Collections" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Collections" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
</TypeForwardingChain>
<TypeParameters>
<TypeParameter Name="T">
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(2)>]</AttributeName>
</Attribute>
</Attributes>
</TypeParameter>
</TypeParameters>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
</Base>
<Interfaces>
<Interface>
<InterfaceName>System.Collections.Generic.ICollection<T></InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.Generic.IEnumerable<T></InterfaceName>
</Interface>
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<AttributeName Language="C#">[System.Diagnostics.DebuggerTypeProxy(typeof(System.Collections.Generic.HashSetDebugView<>))]</AttributeName>
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<typeparam name="T">The type of elements in the hash set.</typeparam>
<summary>Represents a set of values.</summary>
<remarks>For more information about this API, see <see href="/dotnet/fundamentals/runtime-libraries/system-collections-generic-hashset{t}">Supplemental API remarks for HashSet<T></see>.</remarks>
<example>
<format type="text/markdown"><![CDATA[
The following example demonstrates how to merge two disparate sets. This example creates two <xref:System.Collections.Generic.HashSet%601> objects and populates them with even and odd numbers, respectively. A third <xref:System.Collections.Generic.HashSet%601> object is created from the set that contains the even numbers. The example then calls the <xref:System.Collections.Generic.HashSet%601.UnionWith%2A> method, which adds the odd number set to the third set.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/HashSetT/Overview/Program.cs" interactive="try-dotnet-method" id="Snippet01":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/HashSetT/Overview/Program.fs" id="Snippet01":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Collections.Generic.HashSet_UnionWith/vb/Program.vb" id="Snippet01":::
]]></format>
</example>
<altmember cref="T:System.Collections.Generic.SortedSet`1" />
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<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.HashSet`1" /> class.</summary>
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<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.HashSet`1" /> class that is empty and uses the default equality comparer for the set type.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The capacity of a <xref:System.Collections.Generic.HashSet%601> object is the number of elements that the object can hold. A <xref:System.Collections.Generic.HashSet%601> object's capacity automatically increases as elements are added to the object.
This constructor is an O(1) operation.
## Examples
The following example demonstrates how to create and populate two <xref:System.Collections.Generic.HashSet%601> objects. This example is part of a larger example provided for the <xref:System.Collections.Generic.HashSet%601.UnionWith%2A> method.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/HashSetT/Overview/Program.cs" id="Snippet03":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/HashSetT/Overview/Program.fs" id="Snippet03":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Collections.Generic.HashSet_UnionWith/vb/Program.vb" id="Snippet03":::
]]></format>
</remarks>
</Docs>
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<MemberSignature Language="DocId" Value="M:System.Collections.Generic.HashSet`1.#ctor(System.Collections.Generic.IEnumerable{`0})" />
<MemberSignature Language="VB.NET" Value="Public Sub New (collection As IEnumerable(Of T))" />
<MemberSignature Language="F#" Value="new System.Collections.Generic.HashSet<'T> : seq<'T> -> System.Collections.Generic.HashSet<'T>" Usage="new System.Collections.Generic.HashSet<'T> collection" />
<MemberSignature Language="C++ CLI" Value="public:
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<MemberType>Constructor</MemberType>
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<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
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<AssemblyInfo>
<AssemblyName>System.Core</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>3.5.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
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<Parameters>
<Parameter Name="collection" Type="System.Collections.Generic.IEnumerable<T>" />
</Parameters>
<Docs>
<param name="collection">The collection whose elements are copied to the new set.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.HashSet`1" /> class that uses the default equality comparer for the set type, contains elements copied from the specified collection, and has sufficient capacity to accommodate the number of elements copied.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The capacity of a <xref:System.Collections.Generic.HashSet%601> object is the number of elements that the object can hold. A <xref:System.Collections.Generic.HashSet%601> object's capacity automatically increases as elements are added to the object.
If `collection` contains duplicates, the set will contain one of each unique element. No exception will be thrown. Therefore, the size of the resulting set is not identical to the size of `collection`.
This constructor is an O(`n`) operation, where `n` is the number of elements in the `collection` parameter.
## Examples
The following example shows how to create a <xref:System.Collections.Generic.HashSet%601> collection from an existing set. In this example, two sets are created with even and odd integers, respectively. A third <xref:System.Collections.Generic.HashSet%601> object is then created from the even integer set.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/HashSetT/Overview/Program.cs" interactive="try-dotnet-method" id="Snippet01":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/HashSetT/Overview/Program.fs" id="Snippet01":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Collections.Generic.HashSet_UnionWith/vb/Program.vb" id="Snippet02":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="collection" /> is <see langword="null" />.</exception>
</Docs>
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<MemberSignature Language="DocId" Value="M:System.Collections.Generic.HashSet`1.#ctor(System.Collections.Generic.IEqualityComparer{`0})" />
<MemberSignature Language="VB.NET" Value="Public Sub New (comparer As IEqualityComparer(Of T))" />
<MemberSignature Language="F#" Value="new System.Collections.Generic.HashSet<'T> : System.Collections.Generic.IEqualityComparer<'T> -> System.Collections.Generic.HashSet<'T>" Usage="new System.Collections.Generic.HashSet<'T> comparer" />
<MemberSignature Language="C++ CLI" Value="public:
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<MemberType>Constructor</MemberType>
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<Parameter Name="comparer" Type="System.Collections.Generic.IEqualityComparer<T>">
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<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(new System.Byte[] { 2, 1 })]</AttributeName>
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<param name="comparer">The <see cref="T:System.Collections.Generic.IEqualityComparer`1" /> implementation to use when comparing values in the set, or <see langword="null" /> to use the default <see cref="T:System.Collections.Generic.EqualityComparer`1" /> implementation for the set type.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.HashSet`1" /> class that is empty and uses the specified equality comparer for the set type.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The capacity of a <xref:System.Collections.Generic.HashSet%601> object is the number of elements that the object can hold. A <xref:System.Collections.Generic.HashSet%601> object's capacity automatically increases as elements are added to the object.
This constructor is an O(1) operation.
]]></format>
</remarks>
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<MemberSignature Language="C#" Value="public HashSet (int capacity);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(int32 capacity) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.HashSet`1.#ctor(System.Int32)" />
<MemberSignature Language="VB.NET" Value="Public Sub New (capacity As Integer)" />
<MemberSignature Language="F#" Value="new System.Collections.Generic.HashSet<'T> : int -> System.Collections.Generic.HashSet<'T>" Usage="new System.Collections.Generic.HashSet<'T> capacity" />
<MemberSignature Language="C++ CLI" Value="public:
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<MemberType>Constructor</MemberType>
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<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
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<AssemblyInfo>
<AssemblyName>System.Core</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
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<Parameters>
<Parameter Name="capacity" Type="System.Int32" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-4.7.2;netframework-4.8;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
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<Docs>
<param name="capacity">The initial size of the <see cref="T:System.Collections.Generic.HashSet`1" />.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.HashSet`1" /> class that is empty, but has reserved space for <paramref name="capacity" /> items and uses the default equality comparer for the set type.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Since resizes are relatively expensive (require rehashing), this attempts to minimize the need to resize by setting the initial capacity based on the value of the `capacity`.
]]></format>
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<Parameter Name="comparer" Type="System.Collections.Generic.IEqualityComparer<T>">
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<param name="collection">The collection whose elements are copied to the new set.</param>
<param name="comparer">The <see cref="T:System.Collections.Generic.IEqualityComparer`1" /> implementation to use when comparing values in the set, or <see langword="null" /> to use the default <see cref="T:System.Collections.Generic.EqualityComparer`1" /> implementation for the set type.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.HashSet`1" /> class that uses the specified equality comparer for the set type, contains elements copied from the specified collection, and has sufficient capacity to accommodate the number of elements copied.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The capacity of a <xref:System.Collections.Generic.HashSet%601> object is the number of elements that the object can hold. A <xref:System.Collections.Generic.HashSet%601> object's capacity automatically increases as elements are added to the object.
If `collection` contains duplicates, the set will contain one of each unique element. No exception will be thrown. Therefore, the size of the resulting set is not identical to the size of `collection`.
This constructor is an O(`n`) operation, where `n` is the number of elements in the `collection` parameter.
## Examples
The following example uses a supplied <xref:System.Collections.Generic.IEqualityComparer%601> to allow case-insensitive comparisons on the elements of a <xref:System.Collections.Generic.HashSet%601> collection of vehicle types.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.Collections.Generic.HashSet_ExceptWith/cpp/source2.cpp" id="Snippet03":::
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/HashSetT/.ctor/source2.cs" interactive="try-dotnet-method" id="Snippet03":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/HashSetT/.ctor/source2.fs" id="Snippet03":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Collections.Generic.HashSet_ExceptWith/vb/source2.vb" id="Snippet03":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="collection" /> is <see langword="null" />.</exception>
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<param name="capacity">The initial size of the <see cref="T:System.Collections.Generic.HashSet`1" />.</param>
<param name="comparer">The <see cref="T:System.Collections.Generic.IEqualityComparer`1" /> implementation to use when comparing values in the set, or null (Nothing in Visual Basic) to use the default <see cref="T:System.Collections.Generic.IEqualityComparer`1" /> implementation for the set type.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.HashSet`1" /> class that uses the specified equality comparer for the set type, and has sufficient capacity to accommodate <paramref name="capacity" /> elements.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Since resizes are relatively expensive (require rehashing), this attempts to minimize the need to resize by setting the initial capacity based on the value of the `capacity`.
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<param name="info">A <see cref="T:System.Runtime.Serialization.SerializationInfo" /> object that contains the information required to serialize the <see cref="T:System.Collections.Generic.HashSet`1" /> object.</param>
<param name="context">A <see cref="T:System.Runtime.Serialization.StreamingContext" /> structure that contains the source and destination of the serialized stream associated with the <see cref="T:System.Collections.Generic.HashSet`1" /> object.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.HashSet`1" /> class with serialized data.</summary>
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<format type="text/markdown"><.
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<param name="item">The element to add to the set.</param>
<summary>Adds the specified element to a set.</summary>
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<see langword="true" /> if the element is added to the <see cref="T:System.Collections.Generic.HashSet`1" /> object; <see langword="false" /> if the element is already present.</returns>
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## Remarks
If <xref:System.Collections.Generic.HashSet%601.Count%2A> already equals the capacity of the <xref:System.Collections.Generic.HashSet%601> object, the capacity is automatically adjusted to accommodate the new item.
If <xref:System.Collections.Generic.HashSet%601.Count%2A> is less than the capacity of the internal array, this method is an O(1) operation. If the <xref:System.Collections.Generic.HashSet%601> object must be resized, this method becomes an O(`n`) operation, where `n` is <xref:System.Collections.Generic.HashSet%601.Count%2A>.
## Examples
The following example demonstrates how to create and populate two <xref:System.Collections.Generic.HashSet%601> objects. This example is part of a larger example provided for the <xref:System.Collections.Generic.HashSet%601.UnionWith%2A> method.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/HashSetT/Overview/Program.cs" id="Snippet03":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/HashSetT/Overview/Program.fs" id="Snippet03":::
]]></format>
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<summary>Removes all elements from a <see cref="T:System.Collections.Generic.HashSet`1" /> object.</summary>
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## Remarks
<xref:System.Collections.Generic.HashSet%601.Count%2A> is set to zero and references to other objects from elements of the collection are also released. The capacity remains unchanged until a call to <xref:System.Collections.Generic.HashSet%601.TrimExcess%2A> is made.
This method is an O(`n`) operation, where `n` is <xref:System.Collections.Generic.HashSet%601.Count%2A>.
## Examples
The following example creates and populates a <xref:System.Collections.Generic.HashSet%601> collection, then clears it and releases the memory referenced by the collection.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/HashSetT/Clear/Program.cs" interactive="try-dotnet-method" id="Snippet01":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/HashSetT/Clear/Program.fs" id="Snippet01":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Collections.Generic.HashSet_Clear/vb/Program.vb" id="Snippet01":::
]]></format>
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<summary>Gets the <see cref="T:System.Collections.Generic.IEqualityComparer`1" /> object that is used to determine equality for the values in the set.</summary>
<value>The <see cref="T:System.Collections.Generic.IEqualityComparer`1" /> object that is used to determine equality for the values in the set.</value>
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## Remarks
Retrieving the value of this property is an O(1) operation.
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</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Core</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>3.5.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="item" Type="T" />
</Parameters>
<Docs>
<param name="item">The element to locate in the <see cref="T:System.Collections.Generic.HashSet`1" /> object.</param>
<summary>Determines whether a <see cref="T:System.Collections.Generic.HashSet`1" /> object contains the specified element.</summary>
<returns>
<see langword="true" /> if the <see cref="T:System.Collections.Generic.HashSet`1" /> object contains the specified element; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method is an O(1) operation.
## Examples
The following example demonstrates how to remove values from a <xref:System.Collections.Generic.HashSet%601> collection using the <xref:System.Collections.Generic.HashSet%601.Remove%2A> method. In this example, the <xref:System.Collections.Generic.HashSet%601.Contains%2A> method verifies that the set contains a value before removing it.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/HashSetT/Contains/Program.cs" interactive="try-dotnet-method" id="Snippet02":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/HashSetT/Contains/Program.fs" id="Snippet02":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Collections.Generic.HashSet_RemoveWhere/vb/Program.vb" id="Snippet02":::
]]></format>
</remarks>
</Docs>
</Member>
<MemberGroup MemberName="CopyTo">
<AssemblyInfo>
<AssemblyName>System.Collections</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Copies the elements of a <see cref="T:System.Collections.Generic.HashSet`1" /> collection to an array.</summary>
</Docs>
</MemberGroup>
<Member MemberName="CopyTo">
<MemberSignature Language="C#" Value="public void CopyTo (T[] array);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void CopyTo(!T[] array) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.HashSet`1.CopyTo(`0[])" />
<MemberSignature Language="VB.NET" Value="Public Sub CopyTo (array As T())" />
<MemberSignature Language="F#" Value="member this.CopyTo : 'T[] -> unit" Usage="hashSet.CopyTo array" />
<MemberSignature Language="C++ CLI" Value="public:
 void CopyTo(cli::array <T> ^ array);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Collections</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
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<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Core</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>3.5.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="array" Type="T[]" />
</Parameters>
<Docs>
<param name="array">The one-dimensional array that is the destination of the elements copied from the <see cref="T:System.Collections.Generic.HashSet`1" /> object. The array must have zero-based indexing.</param>
<summary>Copies the elements of a <see cref="T:System.Collections.Generic.HashSet`1" /> object to an array.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method is an O(`n`) operation, where `n` is <xref:System.Collections.Generic.HashSet%601.Count%2A>.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="array" /> is <see langword="null" />.</exception>
</Docs>
</Member>
<Member MemberName="CopyTo">
<MemberSignature Language="C#" Value="public void CopyTo (T[] array, int arrayIndex);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void CopyTo(!T[] array, int32 arrayIndex) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.HashSet`1.CopyTo(`0[],System.Int32)" />
<MemberSignature Language="VB.NET" Value="Public Sub CopyTo (array As T(), arrayIndex As Integer)" />
<MemberSignature Language="F#" Value="abstract member CopyTo : 'T[] * int -> unit
override this.CopyTo : 'T[] * int -> unit" Usage="hashSet.CopyTo (array, arrayIndex)" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual void CopyTo(cli::array <T> ^ array, int arrayIndex);" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Collections.Generic.ICollection`1.CopyTo(`0[],System.Int32)</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Collections</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.1.1.0</AssemblyVersion>
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<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Core</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>3.5.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="array" Type="T[]" />
<Parameter Name="arrayIndex" Type="System.Int32" />
</Parameters>
<Docs>
<param name="array">The one-dimensional array that is the destination of the elements copied from the <see cref="T:System.Collections.Generic.HashSet`1" /> object. The array must have zero-based indexing.</param>
<param name="arrayIndex">The zero-based index in <paramref name="array" /> at which copying begins.</param>
<summary>Copies the elements of a <see cref="T:System.Collections.Generic.HashSet`1" /> object to an array, starting at the specified array index.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method is an O(`n`) operation, where `n` is <xref:System.Collections.Generic.HashSet%601.Count%2A>.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="array" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentOutOfRangeException">
<paramref name="arrayIndex" /> is less than 0.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="arrayIndex" /> is greater than the length of the destination <paramref name="array" />.</exception>
</Docs>
</Member>
<Member MemberName="CopyTo">
<MemberSignature Language="C#" Value="public void CopyTo (T[] array, int arrayIndex, int count);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void CopyTo(!T[] array, int32 arrayIndex, int32 count) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.HashSet`1.CopyTo(`0[],System.Int32,System.Int32)" />
<MemberSignature Language="VB.NET" Value="Public Sub CopyTo (array As T(), arrayIndex As Integer, count As Integer)" />
<MemberSignature Language="F#" Value="member this.CopyTo : 'T[] * int * int -> unit" Usage="hashSet.CopyTo (array, arrayIndex, count)" />
<MemberSignature Language="C++ CLI" Value="public:
 void CopyTo(cli::array <T> ^ array, int arrayIndex, int count);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Collections</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
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<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
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<AssemblyInfo>
<AssemblyName>System.Core</AssemblyName>
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