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SortedList<TKey, TValue> Constructor (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>.

Namespace:  System.Collections.Generic
Assembly:  System (in System.dll)
public SortedList(
	int capacity
)

Parameters

capacity
Type: System.Int32

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

ExceptionCondition
ArgumentOutOfRangeException

capacity is less than zero.

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.

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
 */

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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