SortedList<TKey,TValue> Constructors

Reference

Definition

Namespace:: System.Collections.Generic

Assemblies:: System.dll, System.Collections.dll

Assembly:: System.Collections.dll

Assembly:: System.dll

Assembly:: netstandard.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Initializes a new instance of the SortedList<TKey,TValue> class.

Overloads

SortedList<TKey,TValue>()	Initializes a new instance of the SortedList<TKey,TValue> class that is empty, has the default initial capacity, and uses the default IComparer<T>.
SortedList<TKey,TValue>(IComparer<TKey>)	Initializes a new instance of the SortedList<TKey,TValue> class that is empty, has the default initial capacity, and uses the specified IComparer<T>.
SortedList<TKey,TValue>(IDictionary<TKey,TValue>)	Initializes a new instance of the SortedList<TKey,TValue> class that contains elements copied from the specified IDictionary<TKey,TValue>, has sufficient capacity to accommodate the number of elements copied, and uses the default IComparer<T>.
SortedList<TKey,TValue>(Int32)	Initializes a new instance of the SortedList<TKey,TValue> class that is empty, has the specified initial capacity, and uses the default IComparer<T>.
SortedList<TKey,TValue>(IDictionary<TKey,TValue>, IComparer<TKey>)	Initializes a new instance of the SortedList<TKey,TValue> class that contains elements copied from the specified IDictionary<TKey,TValue>, has sufficient capacity to accommodate the number of elements copied, and uses the specified IComparer<T>.
SortedList<TKey,TValue>(Int32, IComparer<TKey>)	Initializes a new instance of the SortedList<TKey,TValue> class that is empty, has the specified initial capacity, and uses the specified IComparer<T>.

SortedList<TKey,TValue>()

Source:: SortedList.cs

Source:: SortedList.cs

Source:: SortedList.cs

Initializes a new instance of the SortedList<TKey,TValue> class that is empty, has the default initial capacity, and uses the default IComparer<T>.

public:
 SortedList();

public SortedList ();

Public Sub New ()

Examples

The following code example creates an empty SortedList<TKey,TValue> of strings with string keys and uses the Add method to add some elements. The example demonstrates that the Add method throws an ArgumentException when attempting to add a duplicate key.

This code example is part of a larger example provided for the SortedList<TKey,TValue> class.

// Create a new sorted list of strings, with string
// keys.
SortedList<String^, String^>^ openWith =
    gcnew SortedList<String^, String^>();

// Add some elements to the list. There are no 
// duplicate keys, but some of the values are duplicates.
openWith->Add("txt", "notepad.exe");
openWith->Add("bmp", "paint.exe");
openWith->Add("dib", "paint.exe");
openWith->Add("rtf", "wordpad.exe");

// The Add method throws an exception if the new key is
// already in the list.
try
{
    openWith->Add("txt", "winword.exe");
}
catch (ArgumentException^)
{
    Console::WriteLine("An element with Key = \"txt\" already exists.");
}

// Create a new sorted list of strings, with string
// keys.
SortedList<string, string> openWith =
    new SortedList<string, string>();

// Add some elements to the list. There are no
// duplicate keys, but some of the values are duplicates.
openWith.Add("txt", "notepad.exe");
openWith.Add("bmp", "paint.exe");
openWith.Add("dib", "paint.exe");
openWith.Add("rtf", "wordpad.exe");

// The Add method throws an exception if the new key is
// already in the list.
try
{
    openWith.Add("txt", "winword.exe");
}
catch (ArgumentException)
{
    Console.WriteLine("An element with Key = \"txt\" already exists.");
}

' Create a new sorted list of strings, with string 
' keys. 
Dim openWith As New SortedList(Of String, String)

' Add some elements to the list. There are no 
' duplicate keys, but some of the values are duplicates.
openWith.Add("txt", "notepad.exe")
openWith.Add("bmp", "paint.exe")
openWith.Add("dib", "paint.exe")
openWith.Add("rtf", "wordpad.exe")

' The Add method throws an exception if the new key is 
' already in the list.
Try
    openWith.Add("txt", "winword.exe")
Catch 
    Console.WriteLine("An element with Key = ""txt"" already exists.")
End Try

// Create a new sorted list of strings, with string
// keys.
let openWith = SortedList<string, string>()

// Add some elements to the list. There are no
// duplicate keys, but some of the values are duplicates.
openWith.Add("txt", "notepad.exe")
openWith.Add("bmp", "paint.exe")
openWith.Add("dib", "paint.exe")
openWith.Add("rtf", "wordpad.exe")

// The Add method throws an exception if the new key is
// already in the list.
try
    openWith.Add("txt", "winword.exe");
with
    | :? ArgumentException ->
        printfn "An element with Key = \"txt\" already exists."

Remarks

Every key in a SortedList<TKey,TValue> must be unique according to the default comparer.

This constructor uses the default value for the initial capacity of the SortedList<TKey,TValue>. To set the initial capacity, use the SortedList<TKey,TValue>(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 SortedList<TKey,TValue>.

This constructor uses the default comparer for TKey. To specify a comparer, use the SortedList<TKey,TValue>(IComparer<TKey>) constructor. The default comparer Comparer<T>.Default checks whether the key type TKey implements System.IComparable<T> and uses that implementation, if available. If not, Comparer<T>.Default checks whether the key type TKey implements System.IComparable. If the key type TKey does not implement either interface, you can specify a System.Collections.Generic.IComparer<T> implementation in a constructor overload that accepts a comparer parameter.

This constructor is an O(1) operation.

Applies to

SortedList<TKey,TValue>(IComparer<TKey>)

Source:: SortedList.cs

Source:: SortedList.cs

Source:: SortedList.cs

Initializes a new instance of the SortedList<TKey,TValue> class that is empty, has the default initial capacity, and uses the specified IComparer<T>.

public:
 SortedList(System::Collections::Generic::IComparer<TKey> ^ comparer);

public SortedList (System.Collections.Generic.IComparer<TKey> comparer);

public SortedList (System.Collections.Generic.IComparer<TKey>? comparer);

new System.Collections.Generic.SortedList<'Key, 'Value> : System.Collections.Generic.IComparer<'Key> -> System.Collections.Generic.SortedList<'Key, 'Value>

Public Sub New (comparer As IComparer(Of TKey))

Parameters

comparer: IComparer<TKey>

The IComparer<T> implementation to use when comparing keys.

-or-

null to use the default Comparer<T> for the type of the key.

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.

using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        // Create a new sorted list of strings, with string keys and
        // a case-insensitive comparer for the current culture.
        SortedList<string, string> openWith =
                      new SortedList<string, string>(
                          StringComparer.CurrentCultureIgnoreCase);

        // Add some elements to the list.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("DIB", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

        // Try to add a fifth element with a key that is the same
        // except for case; this would be allowed with the default
        // comparer.
        try
        {
            openWith.Add("BMP", "paint.exe");
        }
        catch (ArgumentException)
        {
            Console.WriteLine("\nBMP is already in the sorted list.");
        }

        // List the contents of the sorted list.
        Console.WriteLine();
        foreach( KeyValuePair<string, string> kvp in openWith )
        {
            Console.WriteLine("Key = {0}, Value = {1}", kvp.Key,
                kvp.Value);
        }
    }
}

/* This code example produces the following output:

BMP is already in the sorted list.

Key = bmp, Value = paint.exe
Key = DIB, Value = paint.exe
Key = rtf, Value = wordpad.exe
Key = txt, Value = notepad.exe
 */

Imports System.Collections.Generic

Public Class Example
    
    Public Shared Sub Main() 

        ' Create a new sorted list of strings, with string keys and
        ' a case-insensitive comparer for the current culture.
        Dim openWith As New SortedList(Of String, String)( _
            StringComparer.CurrentCultureIgnoreCase)
        
        ' Add some elements to the list. 
        openWith.Add("txt", "notepad.exe")
        openWith.Add("bmp", "paint.exe")
        openWith.Add("DIB", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")

        ' Try to add a fifth element with a key that is the same 
        ' except for case; this would be allowed with the default
        ' comparer.
        Try
            openWith.Add("BMP", "paint.exe")
        Catch ex As ArgumentException
            Console.WriteLine(vbLf & "BMP is already in the sorted list.")
        End Try
        
        ' List the contents of the sorted list.
        Console.WriteLine()
        For Each kvp As KeyValuePair(Of String, String) In openWith
            Console.WriteLine("Key = {0}, Value = {1}", _
                kvp.Key, kvp.Value)
        Next kvp

    End Sub

End Class

' This code example produces the following output:
'
'BMP is already in the sorted list.
'
'Key = bmp, Value = paint.exe
'Key = DIB, Value = paint.exe
'Key = rtf, Value = wordpad.exe
'Key = txt, Value = notepad.exe

Remarks

Every key in a SortedList<TKey,TValue> must be unique according to the specified comparer.

This constructor uses the default value for the initial capacity of the SortedList<TKey,TValue>. To set the initial capacity, use the SortedList<TKey,TValue>(Int32, IComparer<TKey>) 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 SortedList<TKey,TValue>.

This constructor is an O(1) operation.

Applies to

SortedList<TKey,TValue>(IDictionary<TKey,TValue>)

Source:: SortedList.cs

Source:: SortedList.cs

Source:: SortedList.cs

Initializes a new instance of the SortedList<TKey,TValue> class that contains elements copied from the specified IDictionary<TKey,TValue>, has sufficient capacity to accommodate the number of elements copied, and uses the default IComparer<T>.

public:
 SortedList(System::Collections::Generic::IDictionary<TKey, TValue> ^ dictionary);

public SortedList (System.Collections.Generic.IDictionary<TKey,TValue> dictionary);

new System.Collections.Generic.SortedList<'Key, 'Value> : System.Collections.Generic.IDictionary<'Key, 'Value> -> System.Collections.Generic.SortedList<'Key, 'Value>

Public Sub New (dictionary As IDictionary(Of TKey, TValue))

Parameters

dictionary: IDictionary<TKey,TValue>

The IDictionary<TKey,TValue> whose elements are copied to the new SortedList<TKey,TValue>.

Exceptions

ArgumentNullException

dictionary is null.

ArgumentException

dictionary contains one or more duplicate keys.

Examples

The following code example shows how to use SortedList<TKey,TValue> to create a sorted copy of the information in a Dictionary<TKey,TValue>, by passing the Dictionary<TKey,TValue> to the SortedList<TKey,TValue>(IDictionary<TKey,TValue>) constructor.

using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        // Create a new Dictionary of strings, with string keys.
        //
        Dictionary<string, string> openWith =
                                  new Dictionary<string, string>();

        // Add some elements to the dictionary.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

        // Create a SortedList of strings with string keys,
        // and initialize it with the contents of the Dictionary.
        SortedList<string, string> copy =
                  new SortedList<string, string>(openWith);

        // List the contents of the copy.
        Console.WriteLine();
        foreach( KeyValuePair<string, string> kvp in copy )
        {
            Console.WriteLine("Key = {0}, Value = {1}",
               kvp.Key, kvp.Value);
        }
    }
}

/* This code example produces the following output:

Key = bmp, Value = paint.exe
Key = dib, Value = paint.exe
Key = rtf, Value = wordpad.exe
Key = txt, Value = notepad.exe
 */

Imports System.Collections.Generic

Public Class Example
    
    Public Shared Sub Main() 

        ' Create a new Dictionary of strings, with string 
        ' keys.
        Dim openWith As New Dictionary(Of String, String)
        
        ' Add some elements to the dictionary. 
        openWith.Add("txt", "notepad.exe")
        openWith.Add("bmp", "paint.exe")
        openWith.Add("dib", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")
        
        ' Create a SortedList of strings with string keys, 
        ' and initialize it with the contents of the Dictionary.
        Dim copy As New SortedList(Of String, String)(openWith)

        ' List the sorted contents of the copy.
        Console.WriteLine()
        For Each kvp As KeyValuePair(Of String, String) In copy
            Console.WriteLine("Key = {0}, Value = {1}", _
                kvp.Key, kvp.Value)
        Next kvp

    End Sub

End Class

' This code example produces the following output:
'
'Key = bmp, Value = paint.exe
'Key = dib, Value = paint.exe
'Key = rtf, Value = wordpad.exe
'Key = txt, Value = notepad.exe

Remarks

Every key in a SortedList<TKey,TValue> 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 SortedList<TKey,TValue> 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 SortedList<TKey,TValue>(IDictionary<TKey,TValue>, IComparer<TKey>) constructor. The default comparer Comparer<T>.Default checks whether the key type TKey implements System.IComparable<T> and uses that implementation, if available. If not, Comparer<T>.Default checks whether the key type TKey implements System.IComparable. If the key type TKey does not implement either interface, you can specify a System.Collections.Generic.IComparer<T> implementation in a constructor overload that accepts a comparer parameter.

The keys in dictionary are copied to the new SortedList<TKey,TValue> and sorted once, which makes this constructor an O(n log n) operation.

Applies to

SortedList<TKey,TValue>(Int32)

Source:: SortedList.cs

Source:: SortedList.cs

Source:: SortedList.cs

Initializes a new instance of the SortedList<TKey,TValue> class that is empty, has the specified initial capacity, and uses the default IComparer<T>.

public:
 SortedList(int capacity);

public SortedList (int capacity);

new System.Collections.Generic.SortedList<'Key, 'Value> : int -> System.Collections.Generic.SortedList<'Key, 'Value>

Public Sub New (capacity As Integer)

Parameters

capacity: Int32

The initial number of elements that the SortedList<TKey,TValue> can contain.

Exceptions

ArgumentOutOfRangeException

capacity is less than zero.

Examples

The following code example creates a sorted list with an initial capacity of 4 and populates it with 4 entries.

using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        // Create a new sorted list of strings, with string keys and
        // an initial capacity of 4.
        SortedList<string, string> openWith =
                               new SortedList<string, string>(4);

        // Add 4 elements to the list.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

        // List the contents of the sorted list.
        Console.WriteLine();
        foreach( KeyValuePair<string, string> kvp in openWith )
        {
            Console.WriteLine("Key = {0}, Value = {1}",
               kvp.Key, kvp.Value);
        }
    }
}

/* This code example produces the following output:

Key = bmp, Value = paint.exe
Key = dib, Value = paint.exe
Key = rtf, Value = wordpad.exe
Key = txt, Value = notepad.exe
 */

Imports System.Collections.Generic

Public Class Example
    
    Public Shared Sub Main() 

        ' Create a new sorted list of strings, with string keys and
        ' an initial capacity of 4.
        Dim openWith As New SortedList(Of String, String)(4)
        
        ' Add 4 elements to the list. 
        openWith.Add("txt", "notepad.exe")
        openWith.Add("bmp", "paint.exe")
        openWith.Add("dib", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")
        
        ' List the contents of the sorted list.
        Console.WriteLine()
        For Each kvp As KeyValuePair(Of String, String) In openWith
            Console.WriteLine("Key = {0}, Value = {1}", _
                kvp.Key, kvp.Value)
        Next kvp

    End Sub

End Class

' This code example produces the following output:
'
'Key = bmp, Value = paint.exe
'Key = dib, Value = paint.exe
'Key = rtf, Value = wordpad.exe
'Key = txt, Value = notepad.exe

Remarks

Every key in a SortedList<TKey,TValue> must be unique according to the default comparer.

The capacity of a SortedList<TKey,TValue> is the number of elements that the SortedList<TKey,TValue> can hold before resizing. As elements are added to a SortedList<TKey,TValue>, 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 SortedList<TKey,TValue>.

The capacity can be decreased by calling TrimExcess or by setting the Capacity property explicitly. Decreasing the capacity reallocates memory and copies all the elements in the SortedList<TKey,TValue>.

This constructor uses the default comparer for TKey. To specify a comparer, use the SortedList<TKey,TValue>(Int32, IComparer<TKey>) constructor. The default comparer Comparer<T>.Default checks whether the key type TKey implements System.IComparable<T> and uses that implementation, if available. If not, Comparer<T>.Default checks whether the key type TKey implements System.IComparable. If the key type TKey does not implement either interface, you can specify a System.Collections.Generic.IComparer<T> implementation in a constructor overload that accepts a comparer parameter.

This constructor is an O(n) operation, where n is capacity.

Applies to

SortedList<TKey,TValue>(IDictionary<TKey,TValue>, IComparer<TKey>)

Source:: SortedList.cs

Source:: SortedList.cs

Source:: SortedList.cs

public:
 SortedList(System::Collections::Generic::IDictionary<TKey, TValue> ^ dictionary, System::Collections::Generic::IComparer<TKey> ^ comparer);

public SortedList (System.Collections.Generic.IDictionary<TKey,TValue> dictionary, System.Collections.Generic.IComparer<TKey> comparer);

public SortedList (System.Collections.Generic.IDictionary<TKey,TValue> dictionary, System.Collections.Generic.IComparer<TKey>? comparer);

new System.Collections.Generic.SortedList<'Key, 'Value> : System.Collections.Generic.IDictionary<'Key, 'Value> * System.Collections.Generic.IComparer<'Key> -> System.Collections.Generic.SortedList<'Key, 'Value>

Public Sub New (dictionary As IDictionary(Of TKey, TValue), comparer As IComparer(Of TKey))

Parameters

dictionary: IDictionary<TKey,TValue>

The IDictionary<TKey,TValue> whose elements are copied to the new SortedList<TKey,TValue>.

comparer: IComparer<TKey>

The IComparer<T> implementation to use when comparing keys.

-or-

null to use the default Comparer<T> for the type of the key.

Exceptions

ArgumentNullException

dictionary is null.

ArgumentException

dictionary contains one or more duplicate keys.

Examples

The following code example shows how to use SortedList<TKey,TValue> to create a case-insensitive sorted copy of the information in a case-insensitive Dictionary<TKey,TValue>, by passing the Dictionary<TKey,TValue> to the SortedList<TKey,TValue>(IDictionary<TKey,TValue>, IComparer<TKey>) constructor. In this example, the case-insensitive comparers are for the current culture.

using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        // Create a new Dictionary of strings, with string keys and
        // a case-insensitive equality comparer for the current
        // culture.
        Dictionary<string, string> openWith =
            new Dictionary<string, string>
                (StringComparer.CurrentCultureIgnoreCase);

        // Add some elements to the dictionary.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("Bmp", "paint.exe");
        openWith.Add("DIB", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

        // Create a SortedList of strings with string keys and a
        // case-insensitive equality comparer for the current culture,
        // and initialize it with the contents of the Dictionary.
        SortedList<string, string> copy =
            new SortedList<string, string>(openWith,
                StringComparer.CurrentCultureIgnoreCase);

        // List the sorted contents of the copy.
        Console.WriteLine();
        foreach( KeyValuePair<string, string> kvp in copy )
        {
            Console.WriteLine("Key = {0}, Value = {1}", kvp.Key,
                kvp.Value);
        }
    }
}

/* This code example produces the following output:

Key = Bmp, Value = paint.exe
Key = DIB, Value = paint.exe
Key = rtf, Value = wordpad.exe
Key = txt, Value = notepad.exe
 */

Imports System.Collections.Generic

Public Class Example
    
    Public Shared Sub Main() 

        ' Create a new Dictionary of strings, with string keys and
        ' a case-insensitive equality comparer for the current 
        ' culture.
        Dim openWith As New Dictionary(Of String, String)( _
            StringComparer.CurrentCultureIgnoreCase)
        
        ' Add some elements to the dictionary. 
        openWith.Add("txt", "notepad.exe")
        openWith.Add("Bmp", "paint.exe")
        openWith.Add("DIB", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")
        
        ' Create a SortedList of strings with string keys and a 
        ' case-insensitive equality comparer for the current culture,
        ' and initialize it with the contents of the Dictionary.
        Dim copy As New SortedList(Of String, String)(openWith, _
            StringComparer.CurrentCultureIgnoreCase)

        ' List the sorted contents of the copy.
        Console.WriteLine()
        For Each kvp As KeyValuePair(Of String, String) In copy
            Console.WriteLine("Key = {0}, Value = {1}", _
                kvp.Key, kvp.Value)
        Next kvp

    End Sub

End Class

' This code example produces the following output:
'
'Key = Bmp, Value = paint.exe
'Key = DIB, Value = paint.exe
'Key = rtf, Value = wordpad.exe
'Key = txt, Value = notepad.exe

Remarks

Every key in a SortedList<TKey,TValue> 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 SortedList<TKey,TValue> 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 SortedList<TKey,TValue> and sorted once, which makes this constructor an O(n log n) operation.

Applies to

SortedList<TKey,TValue>(Int32, IComparer<TKey>)

Source:: SortedList.cs

Source:: SortedList.cs

Source:: SortedList.cs

Initializes a new instance of the SortedList<TKey,TValue> class that is empty, has the specified initial capacity, and uses the specified IComparer<T>.

public:
 SortedList(int capacity, System::Collections::Generic::IComparer<TKey> ^ comparer);

public SortedList (int capacity, System.Collections.Generic.IComparer<TKey> comparer);

public SortedList (int capacity, System.Collections.Generic.IComparer<TKey>? comparer);

new System.Collections.Generic.SortedList<'Key, 'Value> : int * System.Collections.Generic.IComparer<'Key> -> System.Collections.Generic.SortedList<'Key, 'Value>

Public Sub New (capacity As Integer, comparer As IComparer(Of TKey))

Parameters

capacity: Int32

The initial number of elements that the SortedList<TKey,TValue> can contain.

comparer: IComparer<TKey>

The IComparer<T> implementation to use when comparing keys.

-or-

null to use the default Comparer<T> for the type of the key.

Exceptions

ArgumentOutOfRangeException

capacity is less than zero.

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.

using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        // Create a new sorted list of strings, with string keys, an
        // initial capacity of 5, and a case-insensitive comparer.
        SortedList<string, string> openWith =
                      new SortedList<string, string>(5,
                          StringComparer.CurrentCultureIgnoreCase);

        // Add 4 elements to the list.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("DIB", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

        // Try to add a fifth element with a key that is the same
        // except for case; this would be allowed with the default
        // comparer.
        try
        {
            openWith.Add("BMP", "paint.exe");
        }
        catch (ArgumentException)
        {
            Console.WriteLine("\nBMP is already in the sorted list.");
        }

        // List the contents of the sorted list.
        Console.WriteLine();
        foreach( KeyValuePair<string, string> kvp in openWith )
        {
            Console.WriteLine("Key = {0}, Value = {1}", kvp.Key,
                kvp.Value);
        }
    }
}

/* This code example produces the following output:

BMP is already in the sorted list.

Key = bmp, Value = paint.exe
Key = DIB, Value = paint.exe
Key = rtf, Value = wordpad.exe
Key = txt, Value = notepad.exe
 */

Imports System.Collections.Generic

Public Class Example
    
    Public Shared Sub Main() 

        ' Create a new sorted list of strings, with string keys, an
        ' initial capacity of 5, and a case-insensitive comparer.
        Dim openWith As New SortedList(Of String, String)(5, _
            StringComparer.CurrentCultureIgnoreCase)
        
        ' Add 4 elements to the list. 
        openWith.Add("txt", "notepad.exe")
        openWith.Add("bmp", "paint.exe")
        openWith.Add("DIB", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")

        ' Try to add a fifth element with a key that is the same 
        ' except for case; this would be allowed with the default
        ' comparer.
        Try
            openWith.Add("BMP", "paint.exe")
        Catch ex As ArgumentException
            Console.WriteLine(vbLf & "BMP is already in the sorted list.")
        End Try
        
        ' List the contents of the sorted list.
        Console.WriteLine()
        For Each kvp As KeyValuePair(Of String, String) In openWith
            Console.WriteLine("Key = {0}, Value = {1}", _
                kvp.Key, kvp.Value)
        Next kvp

    End Sub

End Class

' This code example produces the following output:
'
'BMP is already in the sorted list.
'
'Key = bmp, Value = paint.exe
'Key = DIB, Value = paint.exe
'Key = rtf, Value = wordpad.exe
'Key = txt, Value = notepad.exe

Remarks

Every key in a SortedList<TKey,TValue> must be unique according to the specified comparer.

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 SortedList<TKey,TValue>.

This constructor is an O(n) operation, where n is capacity.

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SortedList<TKey,TValue> Constructors

Definition

Overloads

SortedList<TKey,TValue>()

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Applies to

SortedList<TKey,TValue>(IComparer<TKey>)

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SortedList<TKey,TValue>(IDictionary<TKey,TValue>)

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Applies to

SortedList<TKey,TValue>(Int32)

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SortedList<TKey,TValue>(IDictionary<TKey,TValue>, IComparer<TKey>)

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Applies to

SortedList<TKey,TValue>(Int32, IComparer<TKey>)

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Additional resources