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SortedList`2.xml
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3404 lines (3093 loc) · 253 KB
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<Type Name="SortedList<TKey,TValue>" FullName="System.Collections.Generic.SortedList<TKey,TValue>">
<TypeSignature Language="C#" Value="public class SortedList<TKey,TValue> : System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>, System.Collections.Generic.IDictionary<TKey,TValue>, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<TKey,TValue>>, System.Collections.Generic.IReadOnlyCollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>, System.Collections.Generic.IReadOnlyDictionary<TKey,TValue>, System.Collections.IDictionary" FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-11.0;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 public auto ansi beforefieldinit SortedList`2<TKey, TValue> extends System.Object implements class System.Collections.Generic.ICollection`1<valuetype System.Collections.Generic.KeyValuePair`2<!TKey, !TValue>>, class System.Collections.Generic.IDictionary`2<!TKey, !TValue>, class System.Collections.Generic.IEnumerable`1<valuetype System.Collections.Generic.KeyValuePair`2<!TKey, !TValue>>, class System.Collections.Generic.IReadOnlyCollection`1<valuetype System.Collections.Generic.KeyValuePair`2<!TKey, !TValue>>, class System.Collections.Generic.IReadOnlyDictionary`2<!TKey, !TValue>, class System.Collections.ICollection, class System.Collections.IDictionary, class System.Collections.IEnumerable" FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-11.0;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.SortedList`2" />
<TypeSignature Language="VB.NET" Value="Public Class SortedList(Of TKey, TValue)
Implements ICollection(Of KeyValuePair(Of TKey, TValue)), IDictionary, IDictionary(Of TKey, TValue), IEnumerable(Of KeyValuePair(Of TKey, TValue)), IReadOnlyCollection(Of KeyValuePair(Of TKey, TValue)), IReadOnlyDictionary(Of TKey, TValue)" FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-11.0;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 SortedList<'Key, 'Value> = class
 interface ICollection<KeyValuePair<'Key, 'Value>>
 interface seq<KeyValuePair<'Key, 'Value>>
 interface IEnumerable
 interface IDictionary<'Key, 'Value>
 interface IReadOnlyCollection<KeyValuePair<'Key, 'Value>>
 interface IReadOnlyDictionary<'Key, 'Value>
 interface ICollection
 interface IDictionary" FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-11.0;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="generic <typename TKey, typename TValue>
public ref class SortedList : System::Collections::Generic::ICollection<System::Collections::Generic::KeyValuePair<TKey, TValue>>, System::Collections::Generic::IDictionary<TKey, TValue>, System::Collections::Generic::IEnumerable<System::Collections::Generic::KeyValuePair<TKey, TValue>>, System::Collections::Generic::IReadOnlyCollection<System::Collections::Generic::KeyValuePair<TKey, TValue>>, System::Collections::Generic::IReadOnlyDictionary<TKey, TValue>, System::Collections::IDictionary" FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-11.0;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 class SortedList<TKey,TValue> : System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>, System.Collections.Generic.IDictionary<TKey,TValue>, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<TKey,TValue>>, System.Collections.IDictionary" 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="ILAsm" Value=".class public auto ansi serializable beforefieldinit SortedList`2<TKey, TValue> extends System.Object implements class System.Collections.Generic.ICollection`1<valuetype System.Collections.Generic.KeyValuePair`2<!TKey, !TValue>>, class System.Collections.Generic.IDictionary`2<!TKey, !TValue>, class System.Collections.Generic.IEnumerable`1<valuetype System.Collections.Generic.KeyValuePair`2<!TKey, !TValue>>, class System.Collections.ICollection, class System.Collections.IDictionary, 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 Class SortedList(Of TKey, TValue)
Implements ICollection(Of KeyValuePair(Of TKey, TValue)), IDictionary, IDictionary(Of TKey, TValue), IEnumerable(Of KeyValuePair(Of TKey, TValue))" 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="F#" Value="type SortedList<'Key, 'Value> = class
 interface IDictionary<'Key, 'Value>
 interface ICollection<KeyValuePair<'Key, 'Value>>
 interface seq<KeyValuePair<'Key, 'Value>>
 interface IDictionary
 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" />
<TypeSignature Language="C++ CLI" Value="generic <typename TKey, typename TValue>
public ref class SortedList : System::Collections::Generic::ICollection<System::Collections::Generic::KeyValuePair<TKey, TValue>>, System::Collections::Generic::IDictionary<TKey, TValue>, System::Collections::Generic::IEnumerable<System::Collections::Generic::KeyValuePair<TKey, TValue>>, System::Collections::IDictionary" 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="ILAsm" Value=".class public auto ansi serializable beforefieldinit SortedList`2<TKey, TValue> extends System.Object implements class System.Collections.Generic.ICollection`1<valuetype System.Collections.Generic.KeyValuePair`2<!TKey, !TValue>>, class System.Collections.Generic.IDictionary`2<!TKey, !TValue>, class System.Collections.Generic.IEnumerable`1<valuetype System.Collections.Generic.KeyValuePair`2<!TKey, !TValue>>, class System.Collections.Generic.IReadOnlyCollection`1<valuetype System.Collections.Generic.KeyValuePair`2<!TKey, !TValue>>, class System.Collections.Generic.IReadOnlyDictionary`2<!TKey, !TValue>, class System.Collections.ICollection, class System.Collections.IDictionary, 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 SortedList<'Key, 'Value> = class
 interface IDictionary<'Key, 'Value>
 interface ICollection<KeyValuePair<'Key, 'Value>>
 interface seq<KeyValuePair<'Key, 'Value>>
 interface IEnumerable
 interface IDictionary
 interface ICollection
 interface IReadOnlyDictionary<'Key, 'Value>
 interface IReadOnlyCollection<KeyValuePair<'Key, 'Value>>" 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" />
<AssemblyInfo>
<AssemblyName>System.Collections</AssemblyName>
<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>
<AssemblyVersion>10.0.0.0</AssemblyVersion>
<AssemblyVersion>11.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System</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="netstandard" FromVersion="2.1.0.0" To="System.Collections" ToVersion="10.0.0.0" FrameworkAlternate="net-10.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Collections" ToVersion="11.0.0.0" FrameworkAlternate="net-11.0" />
<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-10.0;net-11.0;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<System.Collections.Generic.KeyValuePair<TKey,TValue>></InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.Generic.IDictionary<TKey,TValue></InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<TKey,TValue>></InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.Generic.IEnumerable<T></InterfaceName>
</Interface>
<Interface FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-11.0;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<System.Collections.Generic.KeyValuePair<TKey,TValue>></InterfaceName>
</Interface>
<Interface FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-11.0;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.IReadOnlyDictionary<TKey,TValue></InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.ICollection</InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.IDictionary</InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.IEnumerable</InterfaceName>
</Interface>
</Interfaces>
<Attributes>
<Attribute FrameworkAlternate="net-10.0;net-11.0;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="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>
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<typeparam name="TKey">The type of keys in the collection.</typeparam>
<typeparam name="TValue">The type of values in the collection.</typeparam>
<summary>Represents a collection of key/value pairs that are sorted by key based on the associated <see cref="T:System.Collections.Generic.IComparer`1" /> implementation.</summary>
<remarks>
<format type="text/markdown">< configuration element to `true` in the run-time environment.
The `foreach` statement of the C# language (`For Each` in Visual Basic) returns an object of the type of the elements in the collection. Since the elements of the <xref:System.Collections.Generic.SortedList`2> are key/value pairs, the element type is not the type of the key or the type of the value. Instead, the element type is <xref:System.Collections.Generic.KeyValuePair`2>. For example:
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/remarks.cs" id="Snippet12":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/Overview/remarks.vb" id="Snippet12":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/SortedListTKey,TValue/Overview/remarks.fs" id="Snippet12":::
The `foreach` statement is a wrapper around the enumerator, which only allows reading from, not writing to, the collection.
## Examples
The following code example creates an empty <xref:System.Collections.Generic.SortedList`2> of strings with string keys and uses the <xref:System.Collections.Generic.SortedList`2.Add*> method to add some elements. The example demonstrates that the <xref:System.Collections.Generic.SortedList`2.Add*> method throws an <xref:System.ArgumentException> when attempting to add a duplicate key.
The example uses the <xref:System.Collections.Generic.SortedList`2.Item*> property (the indexer in C#) to retrieve values, demonstrating that a <xref:System.Collections.Generic.KeyNotFoundException> is thrown when a requested key is not present, and showing that the value associated with a key can be replaced.
The example shows how to use the <xref:System.Collections.Generic.SortedList`2.TryGetValue*> method as a more efficient way to retrieve values if a program often must try key values that are not in the sorted list, and it shows how to use the <xref:System.Collections.Generic.SortedList`2.ContainsKey*> method to test whether a key exists before calling the <xref:System.Collections.Generic.SortedList`2.Add*> method.
The example shows how to enumerate the keys and values in the sorted list and how to enumerate the keys and values alone using the <xref:System.Collections.Generic.SortedList`2.Keys> property and the <xref:System.Collections.Generic.SortedList`2.Values> property.
Finally, the example demonstrates the <xref:System.Collections.Generic.SortedList`2.Remove*> method.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/Overview/source.vb" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.fs" id="Snippet1":::
]]></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.SortedList`2" /> 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>
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<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.SortedList`2" /> class that is empty, has the default initial capacity, and uses the default <see cref="T:System.Collections.Generic.IComparer`1" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Every key in a <xref:System.Collections.Generic.SortedList`2> must be unique according to the default comparer.
This constructor uses the default value for the initial capacity of the <xref:System.Collections.Generic.SortedList`2>. To set the initial capacity, use the <xref:System.Collections.Generic.SortedList`2.%23ctor(System.Int32)> constructor. If the final size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the <xref:System.Collections.Generic.SortedList`2>.
This constructor uses the default comparer for `TKey`. To specify a comparer, use the <xref:System.Collections.Generic.SortedList`2.%23ctor(System.Collections.Generic.IComparer%7B`0%7D)> constructor. The default comparer <xref:System.Collections.Generic.Comparer`1.Default*?displayProperty=nameWithType> checks whether the key type `TKey` implements <xref:System.IComparable`1?displayProperty=nameWithType> and uses that implementation, if available. If not, <xref:System.Collections.Generic.Comparer`1.Default*?displayProperty=nameWithType> checks whether the key type `TKey` implements <xref:System.IComparable?displayProperty=nameWithType>. If the key type `TKey` does not implement either interface, you can specify a <xref:System.Collections.Generic.IComparer`1?displayProperty=nameWithType> implementation in a constructor overload that accepts a `comparer` parameter.
This constructor is an O(1) operation.
## Examples
The following code example creates an empty <xref:System.Collections.Generic.SortedList`2> of strings with string keys and uses the <xref:System.Collections.Generic.SortedList`2.Add*> method to add some elements. The example demonstrates that the <xref:System.Collections.Generic.SortedList`2.Add*> method throws an <xref:System.ArgumentException> when attempting to add a duplicate key.
This code example is part of a larger example provided for the <xref:System.Collections.Generic.SortedList`2> class.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.cs" interactive="try-dotnet-method" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/Overview/source.vb" id="Snippet2":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.fs" id="Snippet2":::
]]></format>
</remarks>
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<param name="comparer">The <see cref="T:System.Collections.Generic.IComparer`1" /> implementation to use when comparing keys.
-or-
<see langword="null" /> to use the default <see cref="T:System.Collections.Generic.Comparer`1" /> for the type of the key.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.SortedList`2" /> class that is empty, has the default initial capacity, and uses the specified <see cref="T:System.Collections.Generic.IComparer`1" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Every key in a <xref:System.Collections.Generic.SortedList`2> must be unique according to the specified comparer.
This constructor uses the default value for the initial capacity of the <xref:System.Collections.Generic.SortedList`2>. To set the initial capacity, use the <xref:System.Collections.Generic.SortedList`2.%23ctor(System.Int32,System.Collections.Generic.IComparer%7B`0%7D)> constructor. If the final size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the <xref:System.Collections.Generic.SortedList`2>.
This constructor is an O(1) operation.
## Examples
The following code example creates a sorted list with a case-insensitive comparer for the current culture. The example adds four elements, some with lower-case keys and some with upper-case keys. The example then attempts to add an element with a key that differs from an existing key only by case, catches the resulting exception, and displays an error message. Finally, the example displays the elements in case-insensitive sort order.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/.ctor/source.vb" id="Snippet1":::
]]></format>
</remarks>
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<param name="dictionary">The <see cref="T:System.Collections.Generic.IDictionary`2" /> whose elements are copied to the new <see cref="T:System.Collections.Generic.SortedList`2" />.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.SortedList`2" /> class that contains elements copied from the specified <see cref="T:System.Collections.Generic.IDictionary`2" />, has sufficient capacity to accommodate the number of elements copied, and uses the default <see cref="T:System.Collections.Generic.IComparer`1" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Every key in a <xref:System.Collections.Generic.SortedList`2> must be unique according to the default comparer; likewise, every key in the source `dictionary` must also be unique according to the default comparer.
The capacity of the new <xref:System.Collections.Generic.SortedList`2> is set to the number of elements in `dictionary`, so no resizing takes place while the list is being populated.
This constructor uses the default comparer for `TKey`. To specify a comparer, use the <xref:System.Collections.Generic.SortedList`2.%23ctor(System.Collections.Generic.IDictionary%7B`0,`1%7D,System.Collections.Generic.IComparer%7B`0%7D)> constructor. The default comparer <xref:System.Collections.Generic.Comparer`1.Default*?displayProperty=nameWithType> checks whether the key type `TKey` implements <xref:System.IComparable`1?displayProperty=nameWithType> and uses that implementation, if available. If not, <xref:System.Collections.Generic.Comparer`1.Default*?displayProperty=nameWithType> checks whether the key type `TKey` implements <xref:System.IComparable?displayProperty=nameWithType>. If the key type `TKey` does not implement either interface, you can specify a <xref:System.Collections.Generic.IComparer`1?displayProperty=nameWithType> implementation in a constructor overload that accepts a `comparer` parameter.
The keys in `dictionary` are copied to the new <xref:System.Collections.Generic.SortedList`2> and sorted once, which makes this constructor an O(`n` log `n`) operation.
## Examples
The following code example shows how to use <xref:System.Collections.Generic.SortedList`2> to create a sorted copy of the information in a <xref:System.Collections.Generic.Dictionary`2>, by passing the <xref:System.Collections.Generic.Dictionary`2> to the <xref:System.Collections.Generic.SortedList`2.%23ctor(System.Collections.Generic.IDictionary%7B`0,`1%7D)> constructor.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/source1.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/.ctor/source1.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="dictionary" /> is <see langword="null" />.</exception>
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<paramref name="dictionary" /> contains one or more duplicate keys.</exception>
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<param name="capacity">The initial number of elements that the <see cref="T:System.Collections.Generic.SortedList`2" /> can contain.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.SortedList`2" /> class that is empty, has the specified initial capacity, and uses the default <see cref="T:System.Collections.Generic.IComparer`1" />.</summary>
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<format type="text/markdown"><![CDATA[
## Remarks
Every key in a <xref:System.Collections.Generic.SortedList`2> must be unique according to the default comparer.
The capacity of a <xref:System.Collections.Generic.SortedList`2> is the number of elements that the <xref:System.Collections.Generic.SortedList`2> can hold before resizing. As elements are added to a <xref:System.Collections.Generic.SortedList`2>, the capacity is automatically increased as required by reallocating the internal array.
If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the <xref:System.Collections.Generic.SortedList`2>.
The capacity can be decreased by calling <xref:System.Collections.Generic.SortedList`2.TrimExcess*> or by setting the <xref:System.Collections.Generic.SortedList`2.Capacity> property explicitly. Decreasing the capacity reallocates memory and copies all the elements in the <xref:System.Collections.Generic.SortedList`2>.
This constructor uses the default comparer for `TKey`. To specify a comparer, use the <xref:System.Collections.Generic.SortedList`2.%23ctor(System.Int32,System.Collections.Generic.IComparer%7B`0%7D)> constructor. The default comparer <xref:System.Collections.Generic.Comparer`1.Default*?displayProperty=nameWithType> checks whether the key type `TKey` implements <xref:System.IComparable`1?displayProperty=nameWithType> and uses that implementation, if available. If not, <xref:System.Collections.Generic.Comparer`1.Default*?displayProperty=nameWithType> checks whether the key type `TKey` implements <xref:System.IComparable?displayProperty=nameWithType>. If the key type `TKey` does not implement either interface, you can specify a <xref:System.Collections.Generic.IComparer`1?displayProperty=nameWithType> implementation in a constructor overload that accepts a `comparer` parameter.
This constructor is an O(`n`) operation, where `n` is `capacity`.
## Examples
The following code example creates a sorted list with an initial capacity of 4 and populates it with 4 entries.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/source3.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/.ctor/source3.vb" id="Snippet1":::
]]></format>
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<param name="dictionary">The <see cref="T:System.Collections.Generic.IDictionary`2" /> whose elements are copied to the new <see cref="T:System.Collections.Generic.SortedList`2" />.</param>
<param name="comparer">The <see cref="T:System.Collections.Generic.IComparer`1" /> implementation to use when comparing keys.
-or-
<see langword="null" /> to use the default <see cref="T:System.Collections.Generic.Comparer`1" /> for the type of the key.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.SortedList`2" /> class that contains elements copied from the specified <see cref="T:System.Collections.Generic.IDictionary`2" />, has sufficient capacity to accommodate the number of elements copied, and uses the specified <see cref="T:System.Collections.Generic.IComparer`1" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Every key in a <xref:System.Collections.Generic.SortedList`2> must be unique according to the specified comparer; likewise, every key in the source `dictionary` must also be unique according to the specified comparer.
The capacity of the new <xref:System.Collections.Generic.SortedList`2> is set to the number of elements in `dictionary`, so no resizing takes place while the list is being populated.
The keys in `dictionary` are copied to the new <xref:System.Collections.Generic.SortedList`2> and sorted once, which makes this constructor an O(`n` log `n`) operation.
## Examples
The following code example shows how to use <xref:System.Collections.Generic.SortedList`2> to create a case-insensitive sorted copy of the information in a case-insensitive <xref:System.Collections.Generic.Dictionary`2>, by passing the <xref:System.Collections.Generic.Dictionary`2> to the <xref:System.Collections.Generic.SortedList`2.%23ctor(System.Collections.Generic.IDictionary%7B`0,`1%7D,System.Collections.Generic.IComparer%7B`0%7D)> constructor. In this example, the case-insensitive comparers are for the current culture.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/source2.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/.ctor/source2.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="dictionary" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="dictionary" /> contains one or more duplicate keys.</exception>
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<param name="capacity">The initial number of elements that the <see cref="T:System.Collections.Generic.SortedList`2" /> can contain.</param>
<param name="comparer">The <see cref="T:System.Collections.Generic.IComparer`1" /> implementation to use when comparing keys.
-or-
<see langword="null" /> to use the default <see cref="T:System.Collections.Generic.Comparer`1" /> for the type of the key.</param>
<summary>Initializes a new instance of the <see cref="T:System.Collections.Generic.SortedList`2" /> class that is empty, has the specified initial capacity, and uses the specified <see cref="T:System.Collections.Generic.IComparer`1" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Every key in a <xref:System.Collections.Generic.SortedList`2> must be unique according to the specified comparer.
The capacity of a <xref:System.Collections.Generic.SortedList`2> is the number of elements that the <xref:System.Collections.Generic.SortedList`2> can hold before resizing. As elements are added to a <xref:System.Collections.Generic.SortedList`2>, the capacity is automatically increased as required by reallocating the internal array.
If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the <xref:System.Collections.Generic.SortedList`2>.
The capacity can be decreased by calling <xref:System.Collections.Generic.SortedList`2.TrimExcess*> or by setting the <xref:System.Collections.Generic.SortedList`2.Capacity> property explicitly. Decreasing the capacity reallocates memory and copies all the elements in the <xref:System.Collections.Generic.SortedList`2>.
This constructor is an O(`n`) operation, where `n` is `capacity`.
## Examples
The following code example creates a sorted list with an initial capacity of 5 and a case-insensitive comparer for the current culture. The example adds four elements, some with lower-case keys and some with upper-case keys. The example then attempts to add an element with a key that differs from an existing key only by case, catches the resulting exception, and displays an error message. Finally, the example displays the elements in case-insensitive sort order.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/source4.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/.ctor/source4.vb" id="Snippet1":::
]]></format>
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<Parameter Name="key" Type="TKey" />
<Parameter Name="value" Type="TValue" />
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<param name="key">The key of the element to add.</param>
<param name="value">The value of the element to add. The value can be <see langword="null" /> for reference types.</param>
<summary>Adds an element with the specified key and value into the <see cref="T:System.Collections.Generic.SortedList`2" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
A key cannot be `null`, but a value can be, if the type of values in the sorted list, `TValue`, is a reference type.
You can also use the <xref:System.Collections.Generic.SortedList`2.Item*> property to add new elements by setting the value of a key that does not exist in the <xref:System.Collections.Generic.SortedList`2>; for example, `myCollection["myNonexistentKey"] = myValue`. However, if the specified key already exists in the <xref:System.Collections.Generic.SortedList`2>, setting the <xref:System.Collections.Generic.SortedList`2.Item*> property overwrites the old value. In contrast, the <xref:System.Collections.Generic.SortedList`2.Add*> method does not modify existing elements.
If <xref:System.Collections.Generic.SortedList`2.Count*> already equals <xref:System.Collections.Generic.SortedList`2.Capacity*>, the capacity of the <xref:System.Collections.Generic.SortedList`2> is increased by automatically reallocating the internal array, and the existing elements are copied to the new array before the new element is added.
This method is an O(`n`) operation for unsorted data, where `n` is <xref:System.Collections.Generic.SortedList`2.Count*>. It is an O(log `n`) operation if the new element is added at the end of the list. If insertion causes a resize, the operation is O(`n`).
## Examples
The following code example creates an empty <xref:System.Collections.Generic.SortedList`2> of strings with string keys and uses the <xref:System.Collections.Generic.SortedList`2.Add*> method to add some elements. The example demonstrates that the <xref:System.Collections.Generic.SortedList`2.Add*> method throws an <xref:System.ArgumentException> when attempting to add a duplicate key.
This code example is part of a larger example provided for the <xref:System.Collections.Generic.SortedList`2> class.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.cs" interactive="try-dotnet-method" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/Overview/source.vb" id="Snippet2":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.fs" id="Snippet2":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
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<summary>Gets or sets the number of elements that the <see cref="T:System.Collections.Generic.SortedList`2" /> can contain.</summary>
<value>The number of elements that the <see cref="T:System.Collections.Generic.SortedList`2" /> can contain.</value>
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<format type="text/markdown"><![CDATA[
## Remarks
<xref:System.Collections.Generic.SortedList`2.Capacity*> is the number of elements that the <xref:System.Collections.Generic.SortedList`2> can store. <xref:System.Collections.Generic.SortedList`2.Count*> is the number of elements that are actually in the <xref:System.Collections.Generic.SortedList`2>.
<xref:System.Collections.Generic.SortedList`2.Capacity*> is always greater than or equal to <xref:System.Collections.Generic.SortedList`2.Count*>. If <xref:System.Collections.Generic.SortedList`2.Count*> exceeds <xref:System.Collections.Generic.SortedList`2.Capacity*> while adding elements, the capacity is increased by automatically reallocating the internal array before copying the old elements and adding the new elements.
The capacity can be decreased by calling <xref:System.Collections.Generic.SortedList`2.TrimExcess*> or by setting the <xref:System.Collections.Generic.SortedList`2.Capacity> property explicitly. When the value of <xref:System.Collections.Generic.SortedList`2.Capacity*> is set explicitly, the internal array is also reallocated to accommodate the specified capacity.
Retrieving the value of this property is an O(1) operation; setting the property is an O(`n`) operation, where `n` is the new capacity.
]]></format>
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<summary>Removes all elements from the <see cref="T:System.Collections.Generic.SortedList`2" />.</summary>
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<format type="text/markdown"><![CDATA[
## Remarks
<xref:System.Collections.Generic.SortedList`2.Count*> is set to zero, and references to other objects from elements of the collection are also released.
<xref:System.Collections.Generic.SortedList`2.Capacity*> remains unchanged. To reset the capacity of the <xref:System.Collections.Generic.SortedList`2>, call <xref:System.Collections.Generic.SortedList`2.TrimExcess*> or set the <xref:System.Collections.Generic.SortedList`2.Capacity> property directly. Trimming an empty <xref:System.Collections.Generic.SortedList`2> sets the capacity of the <xref:System.Collections.Generic.SortedList`2> to the default capacity.
This method is an O(`n`) operation, where `n` is <xref:System.Collections.Generic.SortedList`2.Count*>.
]]></format>
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<MemberSignature Language="ILAsm" Value=".property instance class System.Collections.Generic.IComparer`1<!TKey> Comparer" />
<MemberSignature Language="DocId" Value="P:System.Collections.Generic.SortedList`2.Comparer" />
<MemberSignature Language="VB.NET" Value="Public ReadOnly Property Comparer As IComparer(Of TKey)" />
<MemberSignature Language="F#" Value="member this.Comparer : System.Collections.Generic.IComparer<'Key>" Usage="System.Collections.Generic.SortedList<'Key, 'Value>.Comparer" />
<MemberSignature Language="C++ CLI" Value="public:
 property System::Collections::Generic::IComparer<TKey> ^ Comparer { System::Collections::Generic::IComparer<TKey> ^ get(); };" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Collections</AssemblyName>
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<AssemblyInfo>
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<Attributes>
<Attribute FrameworkAlternate="netframework-4.0">
<AttributeName Language="C#">[get: System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
<AttributeName Language="F#">[<get: System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Collections.Generic.IComparer<TKey></ReturnType>
</ReturnValue>
<Docs>
<summary>Gets the <see cref="T:System.Collections.Generic.IComparer`1" /> for the sorted list.</summary>
<value>The <see cref="T:System.IComparable`1" /> for the current <see cref="T:System.Collections.Generic.SortedList`2" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Retrieving the value of this property is an O(1) operation.
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="ContainsKey">
<MemberSignature Language="C#" Value="public bool ContainsKey (TKey key);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance bool ContainsKey(!TKey key) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.SortedList`2.ContainsKey(`0)" />
<MemberSignature Language="VB.NET" Value="Public Function ContainsKey (key As TKey) As Boolean" />
<MemberSignature Language="F#" Value="abstract member ContainsKey : 'Key -> bool
override this.ContainsKey : 'Key -> bool" Usage="sortedList.ContainsKey key" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual bool ContainsKey(TKey key);" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Collections.Generic.IDictionary`2.ContainsKey(`0)</InterfaceMember>
<InterfaceMember FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-11.0;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">M:System.Collections.Generic.IReadOnlyDictionary`2.ContainsKey(`0)</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Collections</AssemblyName>
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</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
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<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="key" Type="TKey" />
</Parameters>
<Docs>
<param name="key">The key to locate in the <see cref="T:System.Collections.Generic.SortedList`2" />.</param>
<summary>Determines whether the <see cref="T:System.Collections.Generic.SortedList`2" /> contains a specific key.</summary>
<returns>
<see langword="true" /> if the <see cref="T:System.Collections.Generic.SortedList`2" /> contains an element with the specified key; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method is an O(log `n`) operation, where `n` is <xref:System.Collections.Generic.SortedList`2.Count*>.
## Examples
The following code example shows how to use the <xref:System.Collections.Generic.SortedList`2.ContainsKey*> method to test whether a key exists prior to calling the <xref:System.Collections.Generic.SortedList`2.Add*> method. It also shows how to use the <xref:System.Collections.Generic.SortedList`2.TryGetValue*> method to retrieve values, which is an efficient way to retrieve values when a program frequently tries keys that are not in the sorted list. Finally, it shows the least efficient way to test whether keys exist, by using the <xref:System.Collections.Generic.SortedList`2.Item*> property (the indexer in C#).
This code example is part of a larger example provided for the <xref:System.Collections.Generic.SortedList`2> class.
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.cs" id="Snippet6":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/Overview/source.vb" id="Snippet6":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.fs" id="Snippet6":::
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.cs" id="Snippet5":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/Overview/source.vb" id="Snippet5":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.fs" id="Snippet5":::
:::code language="csharp" source="~/snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.cs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/System.Collections.Generic/SortedListTKey,TValue/Overview/source.vb" id="Snippet4":::
:::code language="fsharp" source="~/snippets/fsharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.fs" id="Snippet4":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="key" /> is <see langword="null" />.</exception>
<altmember cref="M:System.Collections.Generic.SortedList`2.IndexOfKey(`0)" />
<altmember cref="M:System.Collections.Generic.SortedList`2.ContainsValue(`1)" />
</Docs>
</Member>
<Member MemberName="ContainsValue">
<MemberSignature Language="C#" Value="public bool ContainsValue (TValue value);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool ContainsValue(!TValue value) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Collections.Generic.SortedList`2.ContainsValue(`1)" />
<MemberSignature Language="VB.NET" Value="Public Function ContainsValue (value As TValue) As Boolean" />
<MemberSignature Language="F#" Value="member this.ContainsValue : 'Value -> bool" Usage="sortedList.ContainsValue value" />
<MemberSignature Language="C++ CLI" Value="public:
 bool ContainsValue(TValue value);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Collections</AssemblyName>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>