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Dictionary`2+KeyCollection.xml
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Dictionary`2+KeyCollection.xml
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<Type Name="Dictionary<TKey,TValue>+KeyCollection" FullName="System.Collections.Generic.Dictionary<TKey,TValue>+KeyCollection">
<TypeSignature Language="C#" Value="public sealed class Dictionary<TKey,TValue>.KeyCollection : System.Collections.Generic.ICollection<TKey>, System.Collections.Generic.IEnumerable<TKey>, System.Collections.Generic.IReadOnlyCollection<TKey>, System.Collections.ICollection" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;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-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="ILAsm" Value=".class nested public auto ansi sealed beforefieldinit Dictionary`2/KeyCollection<TKey, TValue> extends System.Object implements class System.Collections.Generic.ICollection`1<!TKey>, class System.Collections.Generic.IEnumerable`1<!TKey>, class System.Collections.Generic.IReadOnlyCollection`1<!TKey>, class System.Collections.ICollection, class System.Collections.IEnumerable" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="DocId" Value="T:System.Collections.Generic.Dictionary`2.KeyCollection" />
<TypeSignature Language="VB.NET" Value="Public NotInheritable Class Dictionary(Of TKey, TValue).KeyCollection
Implements ICollection, ICollection(Of TKey), IEnumerable(Of TKey), IReadOnlyCollection(Of TKey)" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;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-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="F#" Value="type Dictionary<'Key, 'Value>.KeyCollection = class
 interface ICollection<'Key>
 interface seq<'Key>
 interface IEnumerable
 interface IReadOnlyCollection<'Key>
 interface ICollection" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="C++ CLI" Value="public: ref class Dictionary<TKey, TValue>::KeyCollection sealed : System::Collections::Generic::ICollection<TKey>, System::Collections::Generic::IEnumerable<TKey>, System::Collections::Generic::IReadOnlyCollection<TKey>, System::Collections::ICollection" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;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-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="C#" Value="public sealed class Dictionary<TKey,TValue>.KeyCollection : System.Collections.Generic.ICollection<TKey>, System.Collections.Generic.IEnumerable<TKey>, System.Collections.ICollection" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netstandard-1.0;netstandard-1.1;netstandard-1.2" />
<TypeSignature Language="ILAsm" Value=".class nested public auto ansi serializable sealed beforefieldinit Dictionary`2/KeyCollection<TKey, TValue> extends System.Object implements class System.Collections.Generic.ICollection`1<!TKey>, class System.Collections.Generic.IEnumerable`1<!TKey>, class System.Collections.ICollection, class System.Collections.IEnumerable" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2" />
<TypeSignature Language="VB.NET" Value="Public NotInheritable Class Dictionary(Of TKey, TValue).KeyCollection
Implements ICollection, ICollection(Of TKey), IEnumerable(Of TKey)" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netstandard-1.0;netstandard-1.1;netstandard-1.2" />
<TypeSignature Language="F#" Value="type Dictionary<'Key, 'Value>.KeyCollection = class
 interface ICollection<'Key>
 interface seq<'Key>
 interface ICollection
 interface IEnumerable" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netstandard-1.0;netstandard-1.1;netstandard-1.2" />
<TypeSignature Language="C++ CLI" Value="public: ref class Dictionary<TKey, TValue>::KeyCollection sealed : System::Collections::Generic::ICollection<TKey>, System::Collections::Generic::IEnumerable<TKey>, System::Collections::ICollection" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netstandard-1.0;netstandard-1.1;netstandard-1.2" />
<TypeSignature Language="ILAsm" Value=".class nested public auto ansi serializable sealed beforefieldinit Dictionary`2/KeyCollection<TKey, TValue> extends System.Object implements class System.Collections.Generic.ICollection`1<!TKey>, class System.Collections.Generic.IEnumerable`1<!TKey>, class System.Collections.Generic.IReadOnlyCollection`1<!TKey>, class System.Collections.ICollection, class System.Collections.IEnumerable" 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 Dictionary<'Key, 'Value>.KeyCollection = class
 interface ICollection<'Key>
 interface seq<'Key>
 interface IEnumerable
 interface ICollection
 interface IReadOnlyCollection<'Key>" 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="ILAsm" Value=".class nested public auto ansi sealed beforefieldinit Dictionary`2/KeyCollection<TKey, TValue> extends System.Object implements class System.Collections.Generic.ICollection`1<!TKey>, class System.Collections.Generic.IEnumerable`1<!TKey>, class System.Collections.ICollection, class System.Collections.IEnumerable" 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>mscorlib</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</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="mscorlib" 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="TKey" />
<TypeParameter Name="TValue">
<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<TKey></InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.Generic.IEnumerable<T></InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.Generic.IEnumerable<TKey></InterfaceName>
</Interface>
<Interface FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;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-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1">
<InterfaceName>System.Collections.Generic.IReadOnlyCollection<TKey></InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.ICollection</InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.IEnumerable</InterfaceName>
</Interface>
</Interfaces>
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(0)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(0)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;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">
<AttributeName Language="C#">[System.Diagnostics.DebuggerDisplay("Count = {Count}")]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.DebuggerDisplay("Count = {Count}")>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;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">
<AttributeName Language="C#">[System.Diagnostics.DebuggerTypeProxy(typeof(System.Collections.Generic.Mscorlib_DictionaryKeyCollectionDebugView<,>))]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.DebuggerTypeProxy(typeof(System.Collections.Generic.Mscorlib_DictionaryKeyCollectionDebugView<,>))>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;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">
<AttributeName Language="C#">[System.Serializable]</AttributeName>
<AttributeName Language="F#">[<System.Serializable>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Represents the collection of keys in a <see cref="T:System.Collections.Generic.Dictionary`2" />. This class cannot be inherited.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Collections.Generic.Dictionary%602.Keys%2A?displayProperty=nameWithType> property returns an instance of this type, containing all the keys in that <xref:System.Collections.Generic.Dictionary%602>. The order of the keys in the <xref:System.Collections.Generic.Dictionary%602.KeyCollection> is unspecified, but it is the same order as the associated values in the <xref:System.Collections.Generic.Dictionary%602.ValueCollection> returned by the <xref:System.Collections.Generic.Dictionary%602.Values%2A?displayProperty=nameWithType> property.
The <xref:System.Collections.Generic.Dictionary%602.KeyCollection> is not a static copy; instead, the <xref:System.Collections.Generic.Dictionary%602.KeyCollection> refers back to the keys in the original <xref:System.Collections.Generic.Dictionary%602>. Therefore, changes to the <xref:System.Collections.Generic.Dictionary%602> continue to be reflected in the <xref:System.Collections.Generic.Dictionary%602.KeyCollection>.
]]></format>
</remarks>
<threadsafe>Public static (<see langword="Shared" /> in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
A <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" /> can support multiple readers concurrently, as long as the collection is not modified. Even so, enumerating through a collection is intrinsically not a thread-safe procedure. To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization.</threadsafe>
</Docs>
<Members>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public KeyCollection (System.Collections.Generic.Dictionary<TKey,TValue> dictionary);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(class System.Collections.Generic.Dictionary`2<!TKey, !TValue> dictionary) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.#ctor(System.Collections.Generic.Dictionary{`0,`1})" />
<MemberSignature Language="VB.NET" Value="Public Sub New (dictionary As Dictionary(Of TKey, TValue))" />
<MemberSignature Language="F#" Value="new System.Collections.Generic.Dictionary<'Key, 'Value>.KeyCollection : System.Collections.Generic.Dictionary<'Key, 'Value> -> System.Collections.Generic.Dictionary<'Key, 'Value>.KeyCollection" Usage="new System.Collections.Generic.Dictionary<'Key, 'Value>.KeyCollection dictionary" />
<MemberSignature Language="C++ CLI" Value="public:
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<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(1)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(1)>]</AttributeName>
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<Parameters>
<Parameter Name="dictionary" Type="System.Collections.Generic.Dictionary<TKey,TValue>" />
</Parameters>
<Docs>
<param name="dictionary">The <see cref="T:System.Collections.Generic.Dictionary`2" /> whose keys are reflected in the new <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" />.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" /> class that reflects the keys in the specified <see cref="T:System.Collections.Generic.Dictionary`2" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Collections.Generic.Dictionary%602.KeyCollection> is not a static copy; instead, the <xref:System.Collections.Generic.Dictionary%602.KeyCollection> refers back to the keys in the original <xref:System.Collections.Generic.Dictionary%602>. Therefore, changes to the <xref:System.Collections.Generic.Dictionary%602> continue to be reflected in the <xref:System.Collections.Generic.Dictionary%602.KeyCollection>.
This constructor is an O(1) operation.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="dictionary" /> is <see langword="null" />.</exception>
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<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.Contains(`0)" />
<MemberSignature Language="VB.NET" Value="Public Function Contains (item As TKey) As Boolean" />
<MemberSignature Language="F#" Value="abstract member Contains : 'Key -> bool
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<MemberSignature Language="C++ CLI" Value="public:
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<MemberType>Method</MemberType>
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<InterfaceMember>M:System.Collections.Generic.ICollection`1.Contains(`0)</InterfaceMember>
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<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
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<Parameters>
<Parameter Name="item" Type="TKey" Index="0" FrameworkAlternate="net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="item">The object to locate in the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
<summary>Determines whether the <see cref="T:System.Collections.Generic.ICollection`1" /> contains a specific value.</summary>
<returns>
<see langword="true" /> if <paramref name="item" /> is found in the <see cref="T:System.Collections.Generic.ICollection`1" />; otherwise, <see langword="false" />.</returns>
<remarks>To be added.</remarks>
</Docs>
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<Member MemberName="CopyTo">
<MemberSignature Language="C#" Value="public void CopyTo (TKey[] array, int index);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void CopyTo(!TKey[] array, int32 index) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.CopyTo(`0[],System.Int32)" />
<MemberSignature Language="VB.NET" Value="Public Sub CopyTo (array As TKey(), index As Integer)" />
<MemberSignature Language="F#" Value="abstract member CopyTo : 'Key[] * int -> unit
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<MemberSignature Language="C++ CLI" Value="public:
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<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Collections.Generic.ICollection`1.CopyTo(`0[],System.Int32)</InterfaceMember>
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<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(1)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(1)>]</AttributeName>
</Attribute>
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<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="array" Type="TKey[]" />
<Parameter Name="index" Type="System.Int32" />
</Parameters>
<Docs>
<param name="array">The one-dimensional <see cref="T:System.Array" /> that is the destination of the elements copied from <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" />. The <see cref="T:System.Array" /> must have zero-based indexing.</param>
<param name="index">The zero-based index in <paramref name="array" /> at which copying begins.</param>
<summary>Copies the <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" /> elements to an existing one-dimensional <see cref="T:System.Array" />, starting at the specified array index.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The elements are copied to the <xref:System.Array> in the same order in which the enumerator iterates through the <xref:System.Collections.Generic.Dictionary%602.KeyCollection>.
This method is an O(`n`) operation, where `n` is <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Count%2A>.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="array" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentOutOfRangeException">
<paramref name="index" /> is less than zero.</exception>
<exception cref="T:System.ArgumentException">The number of elements in the source <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" /> is greater than the available space from <paramref name="index" /> to the end of the destination <paramref name="array" />.</exception>
<altmember cref="T:System.Array" />
</Docs>
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<MemberSignature Language="C#" Value="public int Count { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance int32 Count" />
<MemberSignature Language="DocId" Value="P:System.Collections.Generic.Dictionary`2.KeyCollection.Count" />
<MemberSignature Language="VB.NET" Value="Public ReadOnly Property Count As Integer" />
<MemberSignature Language="F#" Value="member this.Count : int" Usage="System.Collections.Generic.Dictionary<'Key, 'Value>.KeyCollection.Count" />
<MemberSignature Language="C++ CLI" Value="public:
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<MemberType>Property</MemberType>
<Implements>
<InterfaceMember>P:System.Collections.Generic.ICollection`1.Count</InterfaceMember>
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<ReturnValue>
<ReturnType>System.Int32</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets the number of elements contained in the <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" />.</summary>
<value>The number of elements contained in the <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" />.
Retrieving the value of this property is an O(1) operation.</value>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetEnumerator">
<MemberSignature Language="C#" Value="public System.Collections.Generic.Dictionary<TKey,TValue>.KeyCollection.Enumerator GetEnumerator ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance valuetype System.Collections.Generic.Dictionary`2/KeyCollection/Enumerator<!TKey, !TValue> GetEnumerator() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.GetEnumerator" />
<MemberSignature Language="VB.NET" Value="Public Function GetEnumerator () As Dictionary(Of TKey, TValue).KeyCollection.Enumerator" />
<MemberSignature Language="F#" Value="member this.GetEnumerator : unit -> System.Collections.Generic.Dictionary<'Key, 'Value>.KeyCollection.Enumerator" Usage="keyCollection.GetEnumerator " />
<MemberSignature Language="C++ CLI" Value="public:
 System::Collections::Generic::Dictionary<TKey, TValue>::KeyCollection::Enumerator GetEnumerator();" />
<MemberType>Method</MemberType>
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<AssemblyInfo>
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<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
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<AssemblyInfo>
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<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
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<ReturnValue>
<ReturnType>System.Collections.Generic.Dictionary<TKey,TValue>+KeyCollection+Enumerator</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Returns an enumerator that iterates through the <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" />.</summary>
<returns>A <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection.Enumerator" /> for the <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The `foreach` statement of the C# language (`for each` in C++, `For Each` in Visual Basic) hides the complexity of the enumerators. Therefore, using `foreach` is recommended, instead of directly manipulating the enumerator.
Enumerators can be used to read the data in the collection, but they cannot be used to modify the underlying collection.
Initially, the enumerator is positioned before the first element in the collection. At this position, <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.Current%2A> is undefined. You must call <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.MoveNext%2A> to advance the enumerator to the first element of the collection before reading the value of <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.Current%2A>.
<xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.Current%2A> returns the same object until <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.MoveNext%2A> is called. <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.MoveNext%2A> sets <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.Current%2A> to the next element.
If <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.MoveNext%2A> passes the end of the collection, the enumerator is positioned after the last element in the collection and <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.MoveNext%2A> returns `false`. When the enumerator is at this position, subsequent calls to <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.MoveNext%2A> also return `false`. If the last call to <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.MoveNext%2A> returned `false`, <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.Current%2A> is undefined. You cannot set <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Enumerator.Current%2A> to the first element of the collection again; you must create a new enumerator instance instead.
An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding elements or changing the capacity, the enumerator is irrecoverably invalidated and the next call to <xref:System.Collections.Generic.Dictionary%602.Enumerator.MoveNext%2A> or <xref:System.Collections.Generic.Dictionary%602.Enumerator.System%23Collections%23IEnumerator%23Reset%2A> throws an <xref:System.InvalidOperationException>.
.NET Core 3.0+ only: The only mutating methods which do not invalidate enumerators are <xref:System.Collections.Generic.Dictionary%602.Remove%2A> and <xref:System.Collections.Generic.Dictionary%602.Clear%2A>.
The enumerator does not have exclusive access to the collection; therefore, enumerating through a collection is intrinsically not a thread-safe procedure. To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization.
Default implementations of collections in <xref:System.Collections.Generic?displayProperty=nameWithType> are not synchronized.
This method is an O(1) operation.
]]></format>
</remarks>
<altmember cref="T:System.Collections.Generic.Dictionary`2.KeyCollection.Enumerator" />
<altmember cref="T:System.Collections.Generic.IEnumerator`1" />
</Docs>
</Member>
<Member MemberName="System.Collections.Generic.ICollection<TKey>.Add">
<MemberSignature Language="C#" Value="void ICollection<TKey>.Add (TKey item);" />
<MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance void System.Collections.Generic.ICollection<TKey>.Add(!TKey item) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.System#Collections#Generic#ICollection<TKey>#Add(`0)" />
<MemberSignature Language="VB.NET" Value="Sub Add (item As TKey) Implements ICollection(Of TKey).Add" />
<MemberSignature Language="F#" Value="abstract member System.Collections.Generic.ICollection<TKey>.Add : 'Key -> unit
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<MemberSignature Language="C++ CLI" Value=" virtual void System.Collections.Generic.ICollection<TKey>.Add(TKey item) = System::Collections::Generic::ICollection<TKey>::Add;" />
<MemberType>Method</MemberType>
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<InterfaceMember>M:System.Collections.Generic.ICollection`1.Add(`0)</InterfaceMember>
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<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="item" Type="TKey" />
</Parameters>
<Docs>
<param name="item">The object to add to the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
<summary>Adds an item to the <see cref="T:System.Collections.Generic.ICollection`1" />. This implementation always throws <see cref="T:System.NotSupportedException" />.</summary>
<remarks>To be added.</remarks>
<exception cref="T:System.NotSupportedException">Always thrown.</exception>
<altmember cref="P:System.Collections.Generic.ICollection`1.IsReadOnly" />
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</Member>
<Member MemberName="System.Collections.Generic.ICollection<TKey>.Clear">
<MemberSignature Language="C#" Value="void ICollection<TKey>.Clear ();" />
<MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance void System.Collections.Generic.ICollection<TKey>.Clear() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.System#Collections#Generic#ICollection<TKey>#Clear" />
<MemberSignature Language="VB.NET" Value="Sub Clear () Implements ICollection(Of TKey).Clear" />
<MemberSignature Language="F#" Value="abstract member System.Collections.Generic.ICollection<TKey>.Clear : unit -> unit
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<MemberSignature Language="C++ CLI" Value=" virtual void System.Collections.Generic.ICollection<TKey>.Clear() = System::Collections::Generic::ICollection<TKey>::Clear;" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Collections.Generic.ICollection`1.Clear</InterfaceMember>
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<AssemblyVersion>4.0.0.0</AssemblyVersion>
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<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>
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<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
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<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
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<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Removes all items from the <see cref="T:System.Collections.Generic.ICollection`1" />. This implementation always throws <see cref="T:System.NotSupportedException" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
<xref:System.Collections.Generic.ICollection%601.Count%2A> is set to zero, and references to other objects from elements of the collection are also released.
]]></format>
</remarks>
<exception cref="T:System.NotSupportedException">Always thrown.</exception>
<altmember cref="P:System.Collections.Generic.ICollection`1.IsReadOnly" />
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<Member MemberName="System.Collections.Generic.ICollection<TKey>.Contains">
<MemberSignature Language="C#" Value="bool ICollection<TKey>.Contains (TKey item);" />
<MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance bool System.Collections.Generic.ICollection<TKey>.Contains(!TKey item) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.System#Collections#Generic#ICollection<TKey>#Contains(`0)" />
<MemberSignature Language="VB.NET" Value="Function Contains (item As TKey) As Boolean Implements ICollection(Of TKey).Contains" />
<MemberSignature Language="F#" Value="abstract member System.Collections.Generic.ICollection<TKey>.Contains : 'Key -> bool
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<MemberSignature Language="C++ CLI" Value=" virtual bool System.Collections.Generic.ICollection<TKey>.Contains(TKey item) = System::Collections::Generic::ICollection<TKey>::Contains;" />
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<InterfaceMember>M:System.Collections.Generic.ICollection`1.Contains(`0)</InterfaceMember>
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<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="item" Type="TKey" Index="0" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;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-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
</Parameters>
<Docs>
<param name="item">The object to locate in the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
<summary>Determines whether the <see cref="T:System.Collections.Generic.ICollection`1" /> contains a specific value.</summary>
<returns>
<see langword="true" /> if <paramref name="item" /> is found in the <see cref="T:System.Collections.Generic.ICollection`1" />; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Implementations can vary in how they determine equality of objects; for example, <xref:System.Collections.Generic.List%601> uses <xref:System.Collections.Generic.Comparer%601.Default%2A>, whereas, <xref:System.Collections.Generic.Dictionary%602> allows the user to specify the <xref:System.Collections.Generic.IComparer%601> implementation to use for comparing keys.
This method is an O(1) operation.
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="System.Collections.Generic.ICollection<TKey>.IsReadOnly">
<MemberSignature Language="C#" Value="bool System.Collections.Generic.ICollection<TKey>.IsReadOnly { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance bool System.Collections.Generic.ICollection<TKey>.IsReadOnly" />
<MemberSignature Language="DocId" Value="P:System.Collections.Generic.Dictionary`2.KeyCollection.System#Collections#Generic#ICollection<TKey>#IsReadOnly" />
<MemberSignature Language="VB.NET" Value=" ReadOnly Property IsReadOnly As Boolean Implements ICollection(Of TKey).IsReadOnly" />
<MemberSignature Language="F#" Value="member this.System.Collections.Generic.ICollection<TKey>.IsReadOnly : bool" Usage="System.Collections.Generic.ICollection<TKey>.IsReadOnly" />
<MemberSignature Language="C++ CLI" Value="property bool System::Collections::Generic::ICollection<TKey>::IsReadOnly { bool get(); };" />
<MemberType>Property</MemberType>
<Implements>
<InterfaceMember>P:System.Collections.Generic.ICollection`1.IsReadOnly</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>
<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>mscorlib</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</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>
<Docs>
<summary>Gets a value indicating whether the <see cref="T:System.Collections.Generic.ICollection`1" /> is read-only.</summary>
<value>
<see langword="true" /> if the <see cref="T:System.Collections.Generic.ICollection`1" /> is read-only; otherwise, <see langword="false" />. In the default implementation of <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" />, this property always returns <see langword="true" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
A collection that is read-only does not allow the addition, removal, or modification of elements after the collection is created.
Retrieving the value of this property is an O(1) operation.
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="System.Collections.Generic.ICollection<TKey>.Remove">
<MemberSignature Language="C#" Value="bool ICollection<TKey>.Remove (TKey item);" />
<MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance bool System.Collections.Generic.ICollection<TKey>.Remove(!TKey item) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.System#Collections#Generic#ICollection<TKey>#Remove(`0)" />
<MemberSignature Language="VB.NET" Value="Function Remove (item As TKey) As Boolean Implements ICollection(Of TKey).Remove" />
<MemberSignature Language="F#" Value="abstract member System.Collections.Generic.ICollection<TKey>.Remove : 'Key -> bool
override this.System.Collections.Generic.ICollection<TKey>.Remove : 'Key -> bool" Usage="keyCollection.System.Collections.Generic.ICollection<TKey>.Remove item" />
<MemberSignature Language="C++ CLI" Value=" virtual bool System.Collections.Generic.ICollection<TKey>.Remove(TKey item) = System::Collections::Generic::ICollection<TKey>::Remove;" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Collections.Generic.ICollection`1.Remove(`0)</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>
<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>mscorlib</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</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="TKey" />
</Parameters>
<Docs>
<param name="item">The object to remove from the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
<summary>Removes the first occurrence of a specific object from the <see cref="T:System.Collections.Generic.ICollection`1" />. This implementation always throws <see cref="T:System.NotSupportedException" />.</summary>
<returns>
<see langword="true" /> if <paramref name="item" /> was successfully removed from the <see cref="T:System.Collections.Generic.ICollection`1" />; otherwise, <see langword="false" />. This method also returns <see langword="false" /> if item was not found in the original <see cref="T:System.Collections.Generic.ICollection`1" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Implementations can vary in how they determine equality of objects; for example, <xref:System.Collections.Generic.List%601> uses <xref:System.Collections.Generic.Comparer%601.Default%2A>, whereas, <xref:System.Collections.Generic.Dictionary%602> allows the user to specify the <xref:System.Collections.Generic.IComparer%601> implementation to use for comparing keys.
]]></format>
</remarks>
<exception cref="T:System.NotSupportedException">Always thrown.</exception>
<altmember cref="P:System.Collections.Generic.ICollection`1.IsReadOnly" />
</Docs>
</Member>
<Member MemberName="System.Collections.Generic.IEnumerable<TKey>.GetEnumerator">
<MemberSignature Language="C#" Value="System.Collections.Generic.IEnumerator<TKey> IEnumerable<TKey>.GetEnumerator ();" />
<MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance class System.Collections.Generic.IEnumerator`1<!TKey> System.Collections.Generic.IEnumerable<TKey>.GetEnumerator() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.System#Collections#Generic#IEnumerable<TKey>#GetEnumerator" />
<MemberSignature Language="VB.NET" Value="Function GetEnumerator () As IEnumerator(Of TKey) Implements IEnumerable(Of TKey).GetEnumerator" />
<MemberSignature Language="F#" Value="abstract member System.Collections.Generic.IEnumerable<TKey>.GetEnumerator : unit -> System.Collections.Generic.IEnumerator<'Key>
override this.System.Collections.Generic.IEnumerable<TKey>.GetEnumerator : unit -> System.Collections.Generic.IEnumerator<'Key>" Usage="keyCollection.System.Collections.Generic.IEnumerable<TKey>.GetEnumerator " />
<MemberSignature Language="C++ CLI" Value=" virtual System::Collections::Generic::IEnumerator<TKey> ^ System.Collections.Generic.IEnumerable<TKey>.GetEnumerator() = System::Collections::Generic::IEnumerable<TKey>::GetEnumerator;" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Collections.Generic.IEnumerable`1.GetEnumerator</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>
<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>mscorlib</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</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.Collections.Generic.IEnumerator<TKey></ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Returns an enumerator that iterates through a collection.</summary>
<returns>An <see cref="T:System.Collections.Generic.IEnumerator`1" /> that can be used to iterate through the collection.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The `foreach` statement of the C# language (`for each` in C++, `For Each` in Visual Basic) hides the complexity of the enumerators. Therefore, using `foreach` is recommended, instead of directly manipulating the enumerator.
Enumerators can be used to read the data in the collection, but they cannot be used to modify the underlying collection.
Initially, the enumerator is positioned before the first element in the collection. At this position, <xref:System.Collections.Generic.IEnumerator%601.Current%2A> is undefined. Therefore, you must call <xref:System.Collections.IEnumerator.MoveNext%2A> to advance the enumerator to the first element of the collection before reading the value of <xref:System.Collections.Generic.IEnumerator%601.Current%2A>.
<xref:System.Collections.Generic.IEnumerator%601.Current%2A> returns the same object until <xref:System.Collections.IEnumerator.MoveNext%2A> is called. <xref:System.Collections.IEnumerator.MoveNext%2A> sets <xref:System.Collections.Generic.IEnumerator%601.Current%2A> to the next element.
If <xref:System.Collections.IEnumerator.MoveNext%2A> passes the end of the collection, the enumerator is positioned after the last element in the collection and <xref:System.Collections.IEnumerator.MoveNext%2A> returns `false`. When the enumerator is at this position, subsequent calls to <xref:System.Collections.IEnumerator.MoveNext%2A> also return `false`. If the last call to <xref:System.Collections.IEnumerator.MoveNext%2A> returned `false`, <xref:System.Collections.Generic.IEnumerator%601.Current%2A> is undefined. You cannot set <xref:System.Collections.Generic.IEnumerator%601.Current%2A> to the first element of the collection again; you must create a new enumerator instance instead.
An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding elements or changing the capacity, the enumerator is irrecoverably invalidated and the next call to <xref:System.Collections.Generic.Dictionary%602.Enumerator.MoveNext%2A> or <xref:System.Collections.Generic.Dictionary%602.Enumerator.System%23Collections%23IEnumerator%23Reset%2A> throws an <xref:System.InvalidOperationException>.
.NET Core 3.0+ only: The only mutating methods which do not invalidate enumerators are <xref:System.Collections.Generic.Dictionary%602.Remove%2A> and <xref:System.Collections.Generic.Dictionary%602.Clear%2A>.
The enumerator does not have exclusive access to the collection; therefore, enumerating through a collection is intrinsically not a thread-safe procedure. To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization.
Default implementations of collections in <xref:System.Collections.Generic> are not synchronized.
This method is an O(1) operation.
]]></format>
</remarks>
<altmember cref="T:System.Collections.Generic.IEnumerator`1" />
</Docs>
</Member>
<Member MemberName="System.Collections.ICollection.CopyTo">
<MemberSignature Language="C#" Value="void ICollection.CopyTo (Array array, int index);" />
<MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance void System.Collections.ICollection.CopyTo(class System.Array array, int32 index) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.System#Collections#ICollection#CopyTo(System.Array,System.Int32)" />
<MemberSignature Language="VB.NET" Value="Sub CopyTo (array As Array, index As Integer) Implements ICollection.CopyTo" />
<MemberSignature Language="F#" Value="abstract member System.Collections.ICollection.CopyTo : Array * int -> unit
override this.System.Collections.ICollection.CopyTo : Array * int -> unit" Usage="keyCollection.System.Collections.ICollection.CopyTo (array, index)" />
<MemberSignature Language="C++ CLI" Value=" virtual void System.Collections.ICollection.CopyTo(Array ^ array, int index) = System::Collections::ICollection::CopyTo;" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Collections.ICollection.CopyTo(System.Array,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>
<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>mscorlib</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</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="System.Array" />
<Parameter Name="index" Type="System.Int32" />
</Parameters>
<Docs>
<param name="array">The one-dimensional <see cref="T:System.Array" /> that is the destination of the elements copied from <see cref="T:System.Collections.ICollection" />. The <see cref="T:System.Array" /> must have zero-based indexing.</param>
<param name="index">The zero-based index in <paramref name="array" /> at which copying begins.</param>
<summary>Copies the elements of the <see cref="T:System.Collections.ICollection" /> to an <see cref="T:System.Array" />, starting at a particular <see cref="T:System.Array" /> index.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
> [!NOTE]
> If the type of the source <xref:System.Collections.ICollection> cannot be cast automatically to the type of the destination `array`, the non-generic implementations of <xref:System.Collections.ICollection.CopyTo%2A?displayProperty=nameWithType> throw <xref:System.InvalidCastException>, whereas the generic implementations throw <xref:System.ArgumentException>.
This method is an O(`n`) operation, where `n` is <xref:System.Collections.Generic.Dictionary%602.KeyCollection.Count%2A>.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="array" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentOutOfRangeException">
<paramref name="index" /> is less than zero.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="array" /> is multidimensional.
-or-
<paramref name="array" /> does not have zero-based indexing.
-or-
The number of elements in the source <see cref="T:System.Collections.ICollection" /> is greater than the available space from <paramref name="index" /> to the end of the destination <paramref name="array" />.
-or-
The type of the source <see cref="T:System.Collections.ICollection" /> cannot be cast automatically to the type of the destination <paramref name="array" />.</exception>
<altmember cref="T:System.Collections.ICollection" />
<altmember cref="T:System.Array" />
</Docs>
</Member>
<Member MemberName="System.Collections.ICollection.IsSynchronized">
<MemberSignature Language="C#" Value="bool System.Collections.ICollection.IsSynchronized { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance bool System.Collections.ICollection.IsSynchronized" />
<MemberSignature Language="DocId" Value="P:System.Collections.Generic.Dictionary`2.KeyCollection.System#Collections#ICollection#IsSynchronized" />
<MemberSignature Language="VB.NET" Value=" ReadOnly Property IsSynchronized As Boolean Implements ICollection.IsSynchronized" />
<MemberSignature Language="F#" Value="member this.System.Collections.ICollection.IsSynchronized : bool" Usage="System.Collections.ICollection.IsSynchronized" />
<MemberSignature Language="C++ CLI" Value="property bool System::Collections::ICollection::IsSynchronized { bool get(); };" />
<MemberType>Property</MemberType>
<Implements>
<InterfaceMember>P:System.Collections.ICollection.IsSynchronized</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>
<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>mscorlib</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</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>
<Docs>
<summary>Gets a value indicating whether access to the <see cref="T:System.Collections.ICollection" /> is synchronized (thread safe).</summary>
<value>
<see langword="true" /> if access to the <see cref="T:System.Collections.ICollection" /> is synchronized (thread safe); otherwise, <see langword="false" />. In the default implementation of <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" />, this property always returns <see langword="false" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Default implementations of collections in <xref:System.Collections.Generic?displayProperty=nameWithType> are not synchronized.
Enumerating through a collection is intrinsically not a thread-safe procedure. To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization.
<xref:System.Collections.ICollection.SyncRoot%2A> returns an object that can be used to synchronize access to the <xref:System.Collections.ICollection>. Synchronization is effective only if all threads lock this object before accessing the collection.
Retrieving the value of this property is an O(1) operation.
]]></format>
</remarks>
<altmember cref="P:System.Collections.ICollection.SyncRoot" />
</Docs>
</Member>
<Member MemberName="System.Collections.ICollection.SyncRoot">
<MemberSignature Language="C#" Value="object System.Collections.ICollection.SyncRoot { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance object System.Collections.ICollection.SyncRoot" />
<MemberSignature Language="DocId" Value="P:System.Collections.Generic.Dictionary`2.KeyCollection.System#Collections#ICollection#SyncRoot" />
<MemberSignature Language="VB.NET" Value=" ReadOnly Property SyncRoot As Object Implements ICollection.SyncRoot" />
<MemberSignature Language="F#" Value="member this.System.Collections.ICollection.SyncRoot : obj" Usage="System.Collections.ICollection.SyncRoot" />
<MemberSignature Language="C++ CLI" Value="property System::Object ^ System::Collections::ICollection::SyncRoot { System::Object ^ get(); };" />
<MemberType>Property</MemberType>
<Implements>
<InterfaceMember>P:System.Collections.ICollection.SyncRoot</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>
<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>mscorlib</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</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>
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(1)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(1)>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Object</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets an object that can be used to synchronize access to the <see cref="T:System.Collections.ICollection" />.</summary>
<value>An object that can be used to synchronize access to the <see cref="T:System.Collections.ICollection" />. In the default implementation of <see cref="T:System.Collections.Generic.Dictionary`2.KeyCollection" />, this property always returns the current instance.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Default implementations of collections in <xref:System.Collections.Generic?displayProperty=nameWithType> are not synchronized.
Enumerating through a collection is intrinsically not a thread-safe procedure. To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization.
<xref:System.Collections.ICollection.SyncRoot%2A> returns an object that can be used to synchronize access to the <xref:System.Collections.ICollection>. Synchronization is effective only if all threads lock this object before accessing the collection. The following code shows the use of the <xref:System.Collections.ICollection.SyncRoot%2A> property for C#, C++, and Visual Basic.
```csharp
ICollection ic = ...;
lock (ic.SyncRoot) {
// Access the collection.
}
```
```vb
Dim ic As ICollection = ...
SyncLock ic.SyncRoot
' Access the collection.
End SyncLock
```
```cpp
ICollection^ ic = ...;
try {
Monitor::Enter(ic->SyncRoot);
// Access the collection.
}
finally {
Monitor::Exit(ic->SyncRoot);
}
```
Retrieving the value of this property is an O(1) operation.
]]></format>
</remarks>
<altmember cref="P:System.Collections.ICollection.IsSynchronized" />
</Docs>
</Member>
<Member MemberName="System.Collections.IEnumerable.GetEnumerator">
<MemberSignature Language="C#" Value="System.Collections.IEnumerator IEnumerable.GetEnumerator ();" />
<MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance class System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.Dictionary`2.KeyCollection.System#Collections#IEnumerable#GetEnumerator" />
<MemberSignature Language="VB.NET" Value="Function GetEnumerator () As IEnumerator Implements IEnumerable.GetEnumerator" />
<MemberSignature Language="F#" Value="abstract member System.Collections.IEnumerable.GetEnumerator : unit -> System.Collections.IEnumerator
override this.System.Collections.IEnumerable.GetEnumerator : unit -> System.Collections.IEnumerator" Usage="keyCollection.System.Collections.IEnumerable.GetEnumerator " />
<MemberSignature Language="C++ CLI" Value=" virtual System::Collections::IEnumerator ^ System.Collections.IEnumerable.GetEnumerator() = System::Collections::IEnumerable::GetEnumerator;" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Collections.IEnumerable.GetEnumerator</InterfaceMember>
</Implements>
<AssemblyInfo>
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<AssemblyInfo>
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