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SortedList<TKey, TValue> Constructor (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>.

Namespace:  System.Collections.Generic
Assembly:  System (in System.dll)

public SortedList(
	IComparer<TKey> comparer
)

Parameters

comparer
Type: System.Collections.Generic.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.

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.

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
 */


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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