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StringComparer.xml
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<Type Name="StringComparer" FullName="System.StringComparer">
<TypeSignature Language="C#" Value="public abstract class StringComparer : System.Collections.Generic.IComparer<string>, System.Collections.Generic.IEqualityComparer<string>, System.Collections.IComparer, System.Collections.IEqualityComparer" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi abstract beforefieldinit StringComparer extends System.Object implements class System.Collections.Generic.IComparer`1<string>, class System.Collections.Generic.IEqualityComparer`1<string>, class System.Collections.IComparer, class System.Collections.IEqualityComparer" 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-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="DocId" Value="T:System.StringComparer" />
<TypeSignature Language="VB.NET" Value="Public MustInherit Class StringComparer
Implements IComparer, IComparer(Of String), IEqualityComparer, IEqualityComparer(Of String)" />
<TypeSignature Language="F#" Value="type StringComparer = class
 interface IComparer<string>
 interface IEqualityComparer<string>
 interface IComparer
 interface IEqualityComparer" 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-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="C++ CLI" Value="public ref class StringComparer abstract : System::Collections::Generic::IComparer<System::String ^>, System::Collections::Generic::IEqualityComparer<System::String ^>, System::Collections::IComparer, System::Collections::IEqualityComparer" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi abstract serializable beforefieldinit StringComparer extends System.Object implements class System.Collections.Generic.IComparer`1<string>, class System.Collections.Generic.IEqualityComparer`1<string>, class System.Collections.IComparer, class System.Collections.IEqualityComparer" 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" />
<TypeSignature Language="F#" Value="type StringComparer = class
 interface IComparer
 interface IEqualityComparer
 interface IComparer<string>
 interface IEqualityComparer<string>" 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" />
<AssemblyInfo>
<AssemblyName>System.Runtime.Extensions</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</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>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<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>
<TypeForwardingChain>
<TypeForwarding From="mscorlib" FromVersion="4.0.0.0" To="System.Runtime.Extensions" ToVersion="0.0.0.0" FrameworkAlternate="dotnet-uwp-10.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="5.0.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="6.0.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="7.0.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="8.0.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="9.0.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="4.1.1.1" To="mscorlib" ToVersion="4.0.0.0" FrameworkAlternate="netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
</TypeForwardingChain>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
</Base>
<Interfaces>
<Interface>
<InterfaceName>System.Collections.Generic.IComparer<System.String></InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.Generic.IEqualityComparer<System.String></InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.IComparer</InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.IEqualityComparer</InterfaceName>
</Interface>
</Interfaces>
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(0)>]</AttributeName>
</Attribute>
<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>
<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.Runtime.InteropServices.ComVisible(true)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.InteropServices.ComVisible(true)>]</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 a string comparison operation that uses specific case and culture-based or ordinal comparison rules.</summary>
<remarks>For more information about this API, see <see href="/dotnet/fundamentals/runtime-libraries/system-stringcomparer">Supplemental API remarks for StringComparer</see>.</remarks>
<example>
<format type="text/markdown"><![CDATA[
The following example demonstrates the properties and the <xref:System.StringComparer.Create%2A> method of the <xref:System.StringComparer> class. The example illustrates how different <xref:System.StringComparer> objects sort three versions of the Latin letter I.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.StringComparer/cpp/omni.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/StringComparer/Overview/omni.cs" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/System/StringComparer/Overview/omni.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.StringComparer/vb/omni.vb" id="Snippet1":::
]]></format>
</example>
<altmember cref="T:System.String" />
<altmember cref="T:System.Globalization.CompareOptions" />
</Docs>
<Members>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="protected StringComparer ();" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.StringComparer.#ctor" />
<MemberSignature Language="VB.NET" Value="Protected Sub New ()" />
<MemberSignature Language="C++ CLI" Value="protected:
 StringComparer();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Runtime.Extensions</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</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>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<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>
<Parameters />
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.StringComparer" /> class.</summary>
<remarks>To be added.</remarks>
</Docs>
</Member>
<MemberGroup MemberName="Compare">
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Compares two objects or strings and returns an indication of their relative sort order.</summary>
</Docs>
</MemberGroup>
<Member MemberName="Compare">
<MemberSignature Language="C#" Value="public int Compare (object? x, object? y);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance int32 Compare(object x, object y) cil managed" />
<MemberSignature Language="DocId" Value="M:System.StringComparer.Compare(System.Object,System.Object)" />
<MemberSignature Language="VB.NET" Value="Public Function Compare (x As Object, y As Object) As Integer" />
<MemberSignature Language="F#" Value="abstract member Compare : obj * obj -> int
override this.Compare : obj * obj -> int" Usage="stringComparer.Compare (x, y)" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual int Compare(System::Object ^ x, System::Object ^ y);" />
<MemberSignature Language="C#" Value="public int Compare (object x, object y);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;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-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Collections.IComparer.Compare(System.Object,System.Object)</InterfaceMember>
</Implements>
<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>
<AssemblyInfo>
<AssemblyName>System.Runtime.Extensions</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<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>
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(2)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(2)>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Int32</ReturnType>
</ReturnValue>
<Parameters>
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<Docs>
<param name="x">An object to compare to <paramref name="y" />.</param>
<param name="y">An object to compare to <paramref name="x" />.</param>
<summary>When overridden in a derived class, compares two objects and returns an indication of their relative sort order.</summary>
<returns>A signed integer that indicates the relative values of <paramref name="x" /> and <paramref name="y" />, as shown in the following table.
<list type="table"><listheader><term> Value
</term><description> Meaning
</description></listheader><item><term> Less than zero
</term><description><paramref name="x" /> precedes <paramref name="y" /> in the sort order, or <paramref name="x" /> is <see langword="null" /> and <paramref name="y" /> is not <see langword="null" />.
</description></item><item><term> Zero
</term><description><paramref name="x" /> is equal to <paramref name="y" />, or <paramref name="x" /> and <paramref name="y" /> are both <see langword="null" />.
</description></item><item><term> Greater than zero
</term><description><paramref name="x" /> follows <paramref name="y" /> in the sort order, or <paramref name="y" /> is <see langword="null" /> and <paramref name="x" /> is not <see langword="null" />.
</description></item></list></returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.StringComparer.Compare%28System.String%2CSystem.String%29?displayProperty=nameWithType> method is slightly more efficient than the <xref:System.StringComparer.Compare%28System.Object%2CSystem.Object%29?displayProperty=nameWithType> method because no conversion of the `x` and `y` arguments is needed to perform the comparison.
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">Neither <paramref name="x" /> nor <paramref name="y" /> is a <see cref="T:System.String" /> object, and neither <paramref name="x" /> nor <paramref name="y" /> implements the <see cref="T:System.IComparable" /> interface.</exception>
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<param name="x">A string to compare to <paramref name="y" />.</param>
<param name="y">A string to compare to <paramref name="x" />.</param>
<summary>When overridden in a derived class, compares two strings and returns an indication of their relative sort order.</summary>
<returns>A signed integer that indicates the relative values of <paramref name="x" /> and <paramref name="y" />, as shown in the following table.
<list type="table"><listheader><term> Value
</term><description> Meaning
</description></listheader><item><term> Less than zero
</term><description><paramref name="x" /> precedes <paramref name="y" /> in the sort order, or <paramref name="x" /> is <see langword="null" /> and <paramref name="y" /> is not <see langword="null" />.
</description></item><item><term> Zero
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</description></item><item><term> Greater than zero
</term><description><paramref name="x" /> follows <paramref name="y" /> in the sort order, or <paramref name="y" /> is <see langword="null" /> and <paramref name="x" /> is not <see langword="null" />.
</description></item></list></returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.StringComparer.Compare%28System.String%2CSystem.String%29?displayProperty=nameWithType> method is slightly more efficient than the <xref:System.StringComparer.Compare%28System.Object%2CSystem.Object%29?displayProperty=nameWithType> method because no conversion of the `x` and `y` arguments is needed to perform the comparison.
]]></format>
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<ReturnType>System.StringComparer</ReturnType>
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<Parameters>
<Parameter Name="culture" Type="System.Globalization.CultureInfo" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;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;netstandard-2.0;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" />
<Parameter Name="ignoreCase" Type="System.Boolean" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;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;netstandard-2.0;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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<param name="culture">A culture whose linguistic rules are used to perform a string comparison.</param>
<param name="ignoreCase">
<see langword="true" /> to specify that comparison operations be case-insensitive; <see langword="false" /> to specify that comparison operations be case-sensitive.</param>
<summary>Creates a <see cref="T:System.StringComparer" /> object that compares strings according to the rules of a specified culture.</summary>
<returns>A new <see cref="T:System.StringComparer" /> object that performs string comparisons according to the comparison rules used by the <paramref name="culture" /> parameter and the case rule specified by the <paramref name="ignoreCase" /> parameter.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Examples
The following code example demonstrates the properties and the <xref:System.StringComparer.Create%2A> method of the <xref:System.StringComparer> class. The example illustrates how different <xref:System.StringComparer> objects sort three versions of the Latin letter I.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.StringComparer/cpp/omni.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/StringComparer/Overview/omni.cs" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/System/StringComparer/Overview/omni.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.StringComparer/vb/omni.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="culture" /> is <see langword="null" />.</exception>
<altmember cref="T:System.Globalization.CultureInfo" />
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<param name="culture">A culture whose linguistic rules are used to perform a string comparison.</param>
<param name="options">A bitwise combination of the <see cref="T:System.Globalization.CompareOptions" /> values.</param>
<summary>Creates a <see cref="T:System.StringComparer" /> object that compares strings according to the rules of a specified culture and string options.</summary>
<returns>A new <see cref="T:System.StringComparer" /> object that performs string comparisons according to the comparison rules used by the <paramref name="culture" /> parameter and the specified <paramref name="options" />.</returns>
<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="culture" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="options" /> has invalid flags.</exception>
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<summary>Gets a <see cref="T:System.StringComparer" /> object that performs a case-sensitive string comparison using the word comparison rules of the current culture.</summary>
<value>A new <see cref="T:System.StringComparer" /> object.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.StringComparer> returned by the <xref:System.StringComparer.CurrentCulture%2A> property can be used when strings are linguistically relevant. For example, if strings are displayed to the user, or if strings are the result of user interaction, culture-sensitive string comparison should be used to order the string data.
The current culture is the <xref:System.Globalization.CultureInfo> object associated with the current thread.
The <xref:System.StringComparer.CurrentCulture%2A> property actually returns an instance of an anonymous class derived from the <xref:System.StringComparer> class.
Each call to the <xref:System.StringComparer.CurrentCulture%2A> property `get` accessor returns a new <xref:System.StringComparer> object, as the following code shows.
:::code language="csharp" source="~/snippets/csharp/System/StringComparer/CurrentCulture/CompareObjects.cs" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/System/StringComparer/CurrentCulture/CompareObjects.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.StringComparer.CurrentCulture/vb/CompareObjects.vb" id="Snippet1":::
To improve performance, you can store the <xref:System.StringComparer> object in a local variable rather than retrieve the value of the <xref:System.StringComparer.CurrentCulture%2A> property multiple times.
## Examples
The following code example demonstrates the properties and the <xref:System.StringComparer.Create%2A> method of the <xref:System.StringComparer> class. The example illustrates how different <xref:System.StringComparer> objects sort three versions of the Latin letter I.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.StringComparer/cpp/omni.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/StringComparer/Overview/omni.cs" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/System/StringComparer/Overview/omni.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.StringComparer/vb/omni.vb" id="Snippet1":::
]]></format>
</remarks>
<related type="Article" href="/dotnet/standard/base-types/best-practices-strings">Best Practices for Using Strings in .NET</related>
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<summary>Gets a <see cref="T:System.StringComparer" /> object that performs case-insensitive string comparisons using the word comparison rules of the current culture.</summary>
<value>A new object for string comparison.</value>
<remarks>
<format type="text/markdown"><]
The <xref:System.StringComparer.CurrentCultureIgnoreCase%2A> property actually returns an instance of an anonymous class derived from the <xref:System.StringComparer> class.
Each call to the <xref:System.StringComparer.CurrentCultureIgnoreCase%2A> property `get` accessor returns a new <xref:System.StringComparer> object, as the following code shows.
:::code language="csharp" source="~/snippets/csharp/System/StringComparer/CurrentCulture/CompareObjects.cs" id="Snippet2":::
:::code language="fsharp" source="~/snippets/fsharp/System/StringComparer/CurrentCulture/CompareObjects.fs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.StringComparer.CurrentCulture/vb/CompareObjects.vb" id="Snippet2":::
To improve performance, you can store the <xref:System.StringComparer> object in a local variable rather than retrieve the value of the <xref:System.StringComparer.CurrentCultureIgnoreCase%2A> property multiple times.
]]></format>
</remarks>
<related type="Article" href="/dotnet/standard/base-types/best-practices-strings">Best Practices for Using Strings in .NET</related>
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<Parameter Name="y" Type="System.Object" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;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;netstandard-2.0;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" />
</Parameters>
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<param name="x">An object to compare to <paramref name="y" />.</param>
<param name="y">An object to compare to <paramref name="x" />.</param>
<summary>When overridden in a derived class, indicates whether two objects are equal.</summary>
<returns>
<see langword="true" /> if <paramref name="x" /> and <paramref name="y" /> refer to the same object, or <paramref name="x" /> and <paramref name="y" /> are both the same type of object and those objects are equal, or both <paramref name="x" /> and <paramref name="y" /> are <see langword="null" />; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Because the runtime does not have to unbox `x` or `y` if they are value types or attempt to downcast `x` or `y` to strings if they are reference types, the <xref:System.StringComparer.Equals%28System.String%2CSystem.String%29> method may be slightly more efficient than the <xref:System.StringComparer.Equals%28System.Object%2CSystem.Object%29> method.
]]></format>
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<Parameter Name="y" Type="System.String" />
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<param name="x">A string to compare to <paramref name="y" />.</param>
<param name="y">A string to compare to <paramref name="x" />.</param>
<summary>When overridden in a derived class, indicates whether two strings are equal.</summary>
<returns>
<see langword="true" /> if <paramref name="x" /> and <paramref name="y" /> refer to the same object, or <paramref name="x" /> and <paramref name="y" /> are equal, or <paramref name="x" /> and <paramref name="y" /> are <see langword="null" />; otherwise, <see langword="false" />.</returns>
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<format type="text/markdown"><![CDATA[
## Remarks
Because the runtime does not have to unbox `x` or `y` if they are value types or attempt to downcast `x` or `y` to strings if they are reference types, the <xref:System.StringComparer.Equals%28System.String%2CSystem.String%29> method may be slightly more efficient than the <xref:System.StringComparer.Equals%28System.Object%2CSystem.Object%29> method.
]]></format>
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<param name="comparisonType">A string comparer instance to convert.</param>
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<returns>A <see cref="T:System.StringComparer" /> instance representing the equivalent value of the specified <see cref="T:System.StringComparison" /> instance.</returns>
<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentException">The specified string comparison is not supported.</exception>
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<summary>When overridden in a derived class, gets the hash code for the current <see cref="T:System.StringComparer" /> object.</summary>
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<param name="obj">An object.</param>
<summary>When overridden in a derived class, gets the hash code for the specified object.</summary>
<returns>A 32-bit signed hash code calculated from the value of the <paramref name="obj" /> parameter.</returns>
<remarks>
<format type="text/markdown">< element to the [\<runtime>](/dotnet/framework/configure-apps/file-schema/runtime/runtime-element) section of your application's configuration file.
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">Not enough memory is available to allocate the buffer that is required to compute the hash code.</exception>
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<paramref name="obj" /> is <see langword="null" />.</exception>
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<param name="obj">A string.</param>
<summary>When overridden in a derived class, gets the hash code for the specified string.</summary>
<returns>A 32-bit signed hash code calculated from the value of the <paramref name="obj" /> parameter.</returns>
<remarks>
<format type="text/markdown">< element to the [\<runtime>](/dotnet/framework/configure-apps/file-schema/runtime/runtime-element) section of your application's configuration file.
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">Not enough memory is available to allocate the buffer that is required to compute the hash code.</exception>
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<paramref name="obj" /> is <see langword="null" />.</exception>
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<MemberSignature Language="ILAsm" Value=".property class System.StringComparer InvariantCulture" />
<MemberSignature Language="DocId" Value="P:System.StringComparer.InvariantCulture" />
<MemberSignature Language="VB.NET" Value="Public Shared ReadOnly Property InvariantCulture As StringComparer" />
<MemberSignature Language="F#" Value="static member InvariantCulture : StringComparer" Usage="System.StringComparer.InvariantCulture" />
<MemberSignature Language="C++ CLI" Value="public:
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<MemberType>Property</MemberType>
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<AssemblyVersion>8.0.0.0</AssemblyVersion>
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<ReturnValue>
<ReturnType>System.StringComparer</ReturnType>
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<summary>Gets a <see cref="T:System.StringComparer" /> object that performs a case-sensitive string comparison using the word comparison rules of the invariant culture.</summary>
<value>A new <see cref="T:System.StringComparer" /> object.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.StringComparer> returned by the <xref:System.StringComparer.InvariantCulture%2A> property compares strings in a linguistically relevant manner, but it is not suitable for display in any particular culture. Its major application is to order strings in a way that will be identical across cultures.
The invariant culture is the <xref:System.Globalization.CultureInfo> object returned by the <xref:System.Globalization.CultureInfo.InvariantCulture%2A> property.
The <xref:System.StringComparer.InvariantCulture%2A> property actually returns an instance of an anonymous class derived from the <xref:System.StringComparer> class.
## Examples
The following code example demonstrates the properties and the <xref:System.StringComparer.Create%2A> method of the <xref:System.StringComparer> class. The example illustrates how different <xref:System.StringComparer> objects sort three versions of the Latin letter I.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.StringComparer/cpp/omni.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/StringComparer/Overview/omni.cs" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/System/StringComparer/Overview/omni.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.StringComparer/vb/omni.vb" id="Snippet1":::
]]></format>
</remarks>
<related type="Article" href="/dotnet/standard/base-types/best-practices-strings">Best Practices for Using Strings in .NET</related>
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<MemberSignature Language="F#" Value="static member InvariantCultureIgnoreCase : StringComparer" Usage="System.StringComparer.InvariantCultureIgnoreCase" />
<MemberSignature Language="C++ CLI" Value="public:
 static property StringComparer ^ InvariantCultureIgnoreCase { StringComparer ^ get(); };" />
<MemberType>Property</MemberType>
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