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SortedList.SortedList(IComparer) Constructor

Initializes a new instance of the SortedList class that is empty, has the default initial capacity, and is sorted according to the specified IComparer interface.

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

public SortedList (
	IComparer comparer
)
public SortedList (
	IComparer comparer
)
public function SortedList (
	comparer : IComparer
)
Not applicable.

Parameters

comparer

The IComparer implementation to use when comparing keys.

-or-

a null reference (Nothing in Visual Basic) to use the IComparable implementation of each key.

The elements are sorted according to the specified IComparer implementation. If the comparer parameter is a null reference (Nothing in Visual Basic), the IComparable implementation of each key is used; therefore, each key must implement the IComparable interface to be capable of comparisons with every other key in the SortedList object.

The capacity of a SortedList object is the number of elements that the SortedList can hold. As elements are added to a SortedList, 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 object.

This constructor is an O(1) operation.

The following code example creates collections using different SortedList constructors and demonstrates the differences in the behavior of the collections.

using System;
using System.Collections;
using System.Globalization;

public class SamplesSortedList
{

    public static void Main()
    {

        // Create a SortedList using the default comparer.
        SortedList mySL1 = new SortedList();
        Console.WriteLine("mySL1 (default):");
        mySL1.Add("FIRST", "Hello");
        mySL1.Add("SECOND", "World");
        mySL1.Add("THIRD", "!");
        try
        {
            mySL1.Add("first", "Ola!");
        }
        catch (ArgumentException e)
        {
            Console.WriteLine(e);
        }
        PrintKeysAndValues(mySL1);

        // Create a SortedList using the specified case-insensitive comparer.
        SortedList mySL2 = new SortedList(new CaseInsensitiveComparer());
        Console.WriteLine("mySL2 (case-insensitive comparer):");
        mySL2.Add("FIRST", "Hello");
        mySL2.Add("SECOND", "World");
        mySL2.Add("THIRD", "!");
        try
        {
            mySL2.Add("first", "Ola!");
        }
        catch (ArgumentException e)
        {
            Console.WriteLine(e);
        }
        PrintKeysAndValues(mySL2);

        // Create a SortedList using the specified CaseInsensitiveComparer,
        // which is based on the Turkish culture (tr-TR), where "I" is not
        // the uppercase version of "i".
        CultureInfo myCul = new CultureInfo("tr-TR");
        SortedList mySL3 = new SortedList(new CaseInsensitiveComparer(myCul));
        Console.WriteLine(
            "mySL3 (case-insensitive comparer, Turkish culture):");

        mySL3.Add("FIRST", "Hello");
        mySL3.Add("SECOND", "World");
        mySL3.Add("THIRD", "!");
        try
        {
            mySL3.Add("first", "Ola!");
        }
        catch (ArgumentException e)
        {
            Console.WriteLine(e);
        }
        PrintKeysAndValues(mySL3);

        // Create a SortedList using the
        // StringComparer.InvariantCultureIgnoreCase value.
        SortedList mySL4 = new SortedList(
            StringComparer.InvariantCultureIgnoreCase);

        Console.WriteLine("mySL4 (InvariantCultureIgnoreCase):");
        mySL4.Add("FIRST", "Hello");
        mySL4.Add("SECOND", "World");
        mySL4.Add("THIRD", "!");
        try
        {
            mySL4.Add("first", "Ola!");
        }
        catch (ArgumentException e)
        {
            Console.WriteLine(e);
        }
        PrintKeysAndValues(mySL4);

    }

    public static void PrintKeysAndValues(SortedList myList)
    {
        Console.WriteLine("        -KEY-   -VALUE-");
        for (int i = 0; i < myList.Count; i++)
        {
            Console.WriteLine("        {0,-6}: {1}",
                myList.GetKey(i), myList.GetByIndex(i));
        }
        Console.WriteLine();
    }
}


/* 
This code produces the following output.
Results vary depending on the system's culture settings.

mySL1 (default):
        -KEY-   -VALUE-
        first : Ola!
        FIRST : Hello
        SECOND: World
        THIRD : !

mySL2 (case-insensitive comparer):
System.ArgumentException: Item has already been added.  Key in dictionary: 'FIRST'  Key being added: 'first'
   at System.Collections.SortedList.Add(Object key, Object value)
   at SamplesSortedList.Main()
        -KEY-   -VALUE-
        FIRST : Hello
        SECOND: World
        THIRD : !

mySL3 (case-insensitive comparer, Turkish culture):
        -KEY-   -VALUE-
        FIRST : Hello
        first : Ola!
        SECOND: World
        THIRD : !

mySL4 (InvariantCultureIgnoreCase):
System.ArgumentException: Item has already been added.  Key in dictionary: 'FIRST'  Key being added: 'first'
   at System.Collections.SortedList.Add(Object key, Object value)
   at SamplesSortedList.Main()
        -KEY-   -VALUE-
        FIRST : Hello
        SECOND: World
        THIRD : !

*/


Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

XNA Framework

Supported in: 1.0

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