List<T>.ToArray Metode

Definisi

Ruang nama:

System.Collections.Generic

Rakitan:

netstandard.dll, System.Collections.dll

Sumber:

List.cs

Menyalin elemen ke List<T> array baru.

public:
 cli::array <T> ^ ToArray();

public T[] ToArray();

member this.ToArray : unit -> 'T[]

Public Function ToArray () As T()

Mengembalikan

T[]

Array yang berisi salinan elemen List<T>.

Contoh

Contoh berikut menunjukkan ToArray metode dan metode lain dari List<T> kelas yang bertindak berdasarkan rentang. Di akhir contoh, GetRange metode ini digunakan untuk mendapatkan tiga item dari daftar, dimulai dengan lokasi indeks 2. Metode ToArray ini dipanggil pada yang dihasilkan List<T>, membuat array dari tiga elemen. Elemen array ditampilkan.

using System;
using System.Collections.Generic;

string[] input = { "Apple",
                   "Banana",
                   "Orange" };

List<string> fruits = new List<string>(input);

Console.WriteLine("\nCapacity: {0}", fruits.Capacity);
Console.WriteLine();

foreach (string fruit in fruits)
{
    Console.WriteLine(fruit);
}

Console.WriteLine("\nAddRange(fruits)");
fruits.AddRange(fruits);

Console.WriteLine();
foreach (string fruit in fruits)
{
    Console.WriteLine(fruit);
}

Console.WriteLine("\nRemoveRange(2, 2)");
fruits.RemoveRange(2, 2);

Console.WriteLine();
foreach (string fruit in fruits)
{
    Console.WriteLine(fruit);
}

input = new string[] { "Mango",
                       "Pineapple",
                       "Watermelon" };

Console.WriteLine("\nInsertRange(3, input)");
fruits.InsertRange(3, input);

Console.WriteLine();
foreach (string fruit in fruits)
{
    Console.WriteLine(fruit);
}

Console.WriteLine("\noutput = fruits.GetRange(2, 3).ToArray()");
string[] output = fruits.GetRange(2, 3).ToArray();

Console.WriteLine();
foreach (string fruit in output)
{
    Console.WriteLine(fruit);
}

/*
    This code example produces the following output:

    Capacity: 3

    Apple
    Banana
    Orange

    AddRange(fruits)

    Apple
    Banana
    Orange
    Apple
    Banana
    Orange

    RemoveRange(2, 2)

    Apple
    Banana
    Banana
    Orange

    InsertRange(3, input)

    Apple
    Banana
    Banana
    Mango
    Pineapple
    Watermelon
    Orange

    output = fruits.GetRange(2, 3).ToArray()

    Banana
    Mango
    Pineapple
*/

Imports System.Collections.Generic

Partial Public Class Program
    Public Shared Sub ShowFruits()

        Dim input() As String = { "Apple", _
                                  "Banana", _
                                  "Orange" }

        Dim fruits As New List(Of String)(input)

        Console.WriteLine(vbLf & "Capacity: {0}", fruits.Capacity)
        Console.WriteLine()

        For Each fruit As String In fruits
            Console.WriteLine(fruit)
        Next

        Console.WriteLine(vbLf & "AddRange(fruits)")
        fruits.AddRange(fruits)

        Console.WriteLine()
        For Each fruit As String In fruits
            Console.WriteLine(fruit)
        Next

        Console.WriteLine(vbLf & "RemoveRange(2, 2)")
        fruits.RemoveRange(2, 2)

        Console.WriteLine()
        For Each fruit As String In fruits
            Console.WriteLine(fruit)
        Next

        input = New String() { "Mango", _
                               "Pineapple", _
                               "Watermelon" }

        Console.WriteLine(vbLf & "InsertRange(3, input)")
        fruits.InsertRange(3, input)

        Console.WriteLine()
        For Each fruit As String In fruits
            Console.WriteLine(fruit)
        Next

        Console.WriteLine(vbLf & "output = fruits.GetRange(2, 3).ToArray")
        Dim output() As String = fruits.GetRange(2, 3).ToArray()

        Console.WriteLine()
        For Each fruit As String In output
            Console.WriteLine(fruit)
        Next

    End Sub
End Class

' This code example produces the following output:
'
' Capacity: 3
'
' Apple
' Banana
' Orange
'
' AddRange(fruits)
'
' Apple
' Banana
' Orange
' Apple
' Banana
' Orange
'
' RemoveRange(2, 2)
'
' Apple
' Banana
' Banana
' Orange
'
' InsertRange(3, input)
'
' Apple
' Banana
' Banana
' Mango
' Pineapple
' Watermelon
' Orange
'
' output = fruits.GetRange(2, 3).ToArray
'
' Banana
' Mango
' Pineapple

Keterangan

Elemen disalin menggunakan Array.Copy, yang merupakan operasi O(n), di mana n adalah Count.

Metode ini adalah operasi O(n), di mana n adalah Count.