Queue.ToArrayとは? わかりやすく解説

Queue.ToArray メソッド

メモ : このメソッドは、.NET Framework version 2.0新しく追加されたものです。

Queue要素新し配列コピーします

名前空間: System.Collections.Generic
アセンブリ: System (system.dll 内)
構文構文

解説解説

Queue変更されません。新し配列での要素順序は、Queue先頭から末尾までの要素順序と同じです。

このメソッドは O(n) 操作です。ここで、nCount です。

使用例使用例

ToArray メソッドを含む、Queue ジェネリック クラスいくつかのメソッド使用したコード例次に示します

このコード例では、既定容量文字列キュー作成しEnqueue メソッド使用して 5 つ文字列キュー置きますキュー要素列挙されますが、キューの状態は変化しません。Dequeue メソッド使用して最初文字列キューから取り出しますPeek メソッド使用してキュー内の次の項目を調べてから、Dequeue メソッド使用してキューから取り出します

ToArray メソッド使用して配列作成し、その配列キュー要素コピーしてから、IEnumerable を受け取Queue コンストラクタ配列渡してキューコピー作成しますコピー要素表示されます。

キューの 2 倍のサイズ配列作成されCopyTo メソッド使用して配列中央部で始まる配列要素コピーしますQueue コンストラクタ再度使用して先頭3 つの null 要素を含むキュー2 つ目のコピー作成します

Contains メソッドにより、文字列 "four" がキュー最初コピー含まれていることを示しますその後で、Clear メソッドコピークリアすると、Count プロパティによってキューが空であることが示されます。

Imports System
Imports System.Collections.Generic

Module Example

    Sub Main

        Dim numbers As New
 Queue(Of String)
        numbers.Enqueue("one")
        numbers.Enqueue("two")
        numbers.Enqueue("three")
        numbers.Enqueue("four")
        numbers.Enqueue("five")

        ' A queue can be enumerated without disturbing its contents.
        For Each number As
 String In numbers
            Console.WriteLine(number)
        Next

        Console.WriteLine(vbLf & "Dequeuing '{0}'", numbers.Dequeue())
        Console.WriteLine("Peek at next item to dequeue: {0}",
 _
            numbers.Peek())    
        Console.WriteLine("Dequeuing '{0}'", numbers.Dequeue())

        ' Create a copy of the queue, using the ToArray method and the
        ' constructor that accepts an IEnumerable(Of T).
        Dim queueCopy As New
 Queue(Of String)(numbers.ToArray())

        Console.WriteLine(vbLf & "Contents of the first copy:")
        For Each number As
 String In queueCopy
            Console.WriteLine(number)
        Next
        
        ' Create an array twice the size of the queue, compensating
        ' for the fact that Visual Basic allocates an extra array 
        ' element. Copy the elements of the queue, starting at the
        ' middle of the array. 
        Dim array2((numbers.Count * 2) - 1) As
 String
        numbers.CopyTo(array2, numbers.Count)
        
        ' Create a second queue, using the constructor that accepts
 an
        ' IEnumerable(Of T).
        Dim queueCopy2 As New
 Queue(Of String)(array2)

        Console.WriteLine(vbLf & _
            "Contents of the second copy, with duplicates and
 nulls:")
        For Each number As
 String In queueCopy2
            Console.WriteLine(number)
        Next

        Console.WriteLine(vbLf & "queueCopy.Contains(""four"")
 = {0}", _
            queueCopy.Contains("four"))

        Console.WriteLine(vbLf & "queueCopy.Clear()")
        queueCopy.Clear()
        Console.WriteLine(vbLf & "queueCopy.Count = {0}",
 _
            queueCopy.Count)
    End Sub
End Module

' This code example produces the following output:
'
'one
'two
'three
'four
'five
'
'Dequeuing 'one'
'Peek at next item to dequeue: two
'
'Dequeuing 'two'
'
'Contents of the copy:
'three
'four
'five
'
'Contents of the second copy, with duplicates and nulls:
'
'
'
'three
'four
'five
'
'queueCopy.Contains("four") = True
'
'queueCopy.Clear()
'
'queueCopy.Count = 0
using System;
using System.Collections.Generic;

class Example
{
    public static void Main()
    {
        Queue<string> numbers = new Queue<string>();
        numbers.Enqueue("one");
        numbers.Enqueue("two");
        numbers.Enqueue("three");
        numbers.Enqueue("four");
        numbers.Enqueue("five");

        // A queue can be enumerated without disturbing its contents.
        foreach( string number in
 numbers )
        {
            Console.WriteLine(number);
        }

        Console.WriteLine("\nDequeuing '{0}'", numbers.Dequeue());
        Console.WriteLine("Peek at next item to dequeue: {0}", 
            numbers.Peek());
        Console.WriteLine("Dequeuing '{0}'", numbers.Dequeue());

        // Create a copy of the queue, using the ToArray method and
 the
        // constructor that accepts an IEnumerable<T>.
        Queue<string> queueCopy = new
 Queue<string>(numbers.ToArray());

        Console.WriteLine("\nContents of the first copy:");
        foreach( string number in
 queueCopy )
        {
            Console.WriteLine(number);
        }
        
        // Create an array twice the size of the queue and copy the
        // elements of the queue, starting at the middle of the 
        // array. 
        string[] array2 = new string[numbers.Count
 * 2];
        numbers.CopyTo(array2, numbers.Count);
        
        // Create a second queue, using the constructor that accepts
 an
        // IEnumerable(Of T).
        Queue<string> queueCopy2 = new
 Queue<string>(array2);

        Console.WriteLine("\nContents of the second copy, with duplicates and
 nulls:");
        foreach( string number in
 queueCopy2 )
        {
            Console.WriteLine(number);
        }

        Console.WriteLine("\nqueueCopy.Contains(\"four\") = {0}",
 
            queueCopy.Contains("four"));

        Console.WriteLine("\nqueueCopy.Clear()");
        queueCopy.Clear();
        Console.WriteLine("\nqueueCopy.Count = {0}", queueCopy.Count);
    }
}

/* This code example produces the following output:

one
two
three
four
five

Dequeuing 'one'
Peek at next item to dequeue: two
Dequeuing 'two'

Contents of the copy:
three
four
five

Contents of the second copy, with duplicates and nulls:



three
four
five

queueCopy.Contains("four") = True

queueCopy.Clear()

queueCopy.Count = 0
 */
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Queue.ToArray メソッド

Queue要素新し配列コピーします

名前空間: System.Collections
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

解説解説

Queue変更されません。新し配列での要素順序は、Queue先頭から末尾までの要素順序と同じです。

このメソッドは O(n) 操作です。ここで、nCount です。

使用例使用例

Queue1 次元配列コピーする方法の例を次に示します

Imports System
Imports System.Collections
Imports Microsoft.VisualBasic

Public Class SamplesQueue    

    Public Shared Sub Main()

        ' Creates and initializes the source Queue.
        Dim mySourceQ As New
 Queue()
        mySourceQ.Enqueue("three")
        mySourceQ.Enqueue("napping")
        mySourceQ.Enqueue("cats")
        mySourceQ.Enqueue("in")
        mySourceQ.Enqueue("the")
        mySourceQ.Enqueue("barn")

        ' Creates and initializes the one-dimensional target Array.
        Dim myTargetArray As Array = Array.CreateInstance(GetType(String),
 15)
        myTargetArray.SetValue("The", 0)
        myTargetArray.SetValue("quick", 1)
        myTargetArray.SetValue("brown", 2)
        myTargetArray.SetValue("fox", 3)
        myTargetArray.SetValue("jumped", 4)
        myTargetArray.SetValue("over", 5)
        myTargetArray.SetValue("the", 6)
        myTargetArray.SetValue("lazy", 7)
        myTargetArray.SetValue("dog", 8)

        ' Displays the values of the target Array.
        Console.WriteLine("The target Array contains the "
 & _
           "following (before and after copying):")
        PrintValues(myTargetArray, " "c)

        ' Copies the entire source Queue to the target Array, starting
        ' at index 6.
        mySourceQ.CopyTo(myTargetArray, 6)

        ' Displays the values of the target Array.
        PrintValues(myTargetArray, " "c)

        ' Copies the entire source Queue to a new standard array.
        Dim myStandardArray As Object()
 = mySourceQ.ToArray()

        ' Displays the values of the new standard array.
        Console.WriteLine("The new standard array contains the
 following:")
        PrintValues(myStandardArray, " "c)

    End Sub

    Public Shared Sub PrintValues(myArr
 As Array, mySeparator As Char)
        Dim myObj As [Object]
        For Each myObj In
  myArr
            Console.Write("{0}{1}", mySeparator, myObj)
        Next myObj
        Console.WriteLine()
    End Sub 'PrintValues

End Class 'SamplesQueue


' This code produces the following output.
' 
' The target Array contains the following (before and after copying):
'  The quick brown fox jumped over the lazy dog
'  The quick brown fox jumped over three napping cats in the barn
' The new standard array contains the following:
'  three napping cats in the barn

using System;
using System.Collections;
public class SamplesQueue  {

   public static void Main()
  {

      // Creates and initializes the source Queue.
      Queue mySourceQ = new Queue();
      mySourceQ.Enqueue( "three" );
      mySourceQ.Enqueue( "napping" );
      mySourceQ.Enqueue( "cats" );
      mySourceQ.Enqueue( "in" );
      mySourceQ.Enqueue( "the" );
      mySourceQ.Enqueue( "barn" );

      // Creates and initializes the one-dimensional target Array.
      Array myTargetArray=Array.CreateInstance( typeof(String), 15 );
      myTargetArray.SetValue( "The", 0 );
      myTargetArray.SetValue( "quick", 1 );
      myTargetArray.SetValue( "brown", 2 );
      myTargetArray.SetValue( "fox", 3 );
      myTargetArray.SetValue( "jumped", 4 );
      myTargetArray.SetValue( "over", 5 );
      myTargetArray.SetValue( "the", 6 );
      myTargetArray.SetValue( "lazy", 7 );
      myTargetArray.SetValue( "dog", 8 );

      // Displays the values of the target Array.
      Console.WriteLine( "The target Array contains the following (before and
 after copying):" );
      PrintValues( myTargetArray, ' ' );

      // Copies the entire source Queue to the target Array, starting
 at index 6.
      mySourceQ.CopyTo( myTargetArray, 6 );

      // Displays the values of the target Array.
      PrintValues( myTargetArray, ' ' );

      // Copies the entire source Queue to a new standard array.
      Object[] myStandardArray = mySourceQ.ToArray();

      // Displays the values of the new standard array.
      Console.WriteLine( "The new standard array contains
 the following:" );
      PrintValues( myStandardArray, ' ' );
   }


   public static void PrintValues(
 Array myArr, char mySeparator )  {
      foreach ( Object myObj in myArr )  {
         Console.Write( "{0}{1}", mySeparator, myObj );
      }
      Console.WriteLine();
   }
}
/* 
This code produces the following output.

The target Array contains the following (before and after copying):
 The quick brown fox jumped over the lazy dog
 The quick brown fox jumped over three napping cats in the barn
The new standard array contains the following:
 three napping cats in the barn

*/ 
using namespace System;
using namespace System::Collections;
void PrintValues( Array^ myArr, char mySeparator
 );
int main()
{
   // Creates and initializes the source Queue.
   Queue^ mySourceQ = gcnew Queue;
   mySourceQ->Enqueue( "three" );
   mySourceQ->Enqueue( "napping" );
   mySourceQ->Enqueue( "cats" );
   mySourceQ->Enqueue( "in" );
   mySourceQ->Enqueue( "the" );
   mySourceQ->Enqueue( "barn" );

   // Creates and initializes the one-dimensional target Array.
   Array^ myTargetArray = Array::CreateInstance( String::typeid, 15 );
   myTargetArray->SetValue( "The", 0 );
   myTargetArray->SetValue( "quick", 1 );
   myTargetArray->SetValue( "brown", 2 );
   myTargetArray->SetValue( "fox", 3 );
   myTargetArray->SetValue( "jumped", 4 );
   myTargetArray->SetValue( "over", 5 );
   myTargetArray->SetValue( "the", 6 );
   myTargetArray->SetValue( "lazy", 7 );
   myTargetArray->SetValue( "dog", 8 );

   // Displays the values of the target Array.
   Console::WriteLine( "The target Array contains the following (before and
 after copying):" );
   PrintValues( myTargetArray, ' ' );

   // Copies the entire source Queue to the target Array, starting at
 index 6.
   mySourceQ->CopyTo( myTargetArray, 6 );

   // Displays the values of the target Array.
   PrintValues( myTargetArray, ' ' );

   // Copies the entire source Queue to a new standard array.
   array<Object^>^myStandardArray = mySourceQ->ToArray();

   // Displays the values of the new standard array.
   Console::WriteLine( "The new standard array contains the
 following:" );
   PrintValues( myStandardArray, ' ' );
}

void PrintValues( Array^ myArr, char mySeparator
 )
{
   IEnumerator^ myEnum = myArr->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Object^ myObj = safe_cast<Object^>(myEnum->Current);
      Console::Write( "{0}{1}", mySeparator, myObj );
   }

   Console::WriteLine();
}

/* 
 This code produces the following output.
 
 The target Array contains the following (before and after copying):
  The quick brown fox jumped over the lazy dog
  The quick brown fox jumped over three napping cats in the barn
 The new standard array contains the following:
  three napping cats in the barn

 */
import System.*;
import System.Collections.*;

public class SamplesQueue
{
    public static void main(String[]
 args)
    {
        // Creates and initializes the source Queue.
        Queue mySourceQ =  new Queue();
        mySourceQ.Enqueue("three");
        mySourceQ.Enqueue("napping");
        mySourceQ.Enqueue("cats");
        mySourceQ.Enqueue("in");
        mySourceQ.Enqueue("the");
        mySourceQ.Enqueue("barn");

        // Creates and initializes the one-dimensional target Array.
        Array myTargetArray = Array.CreateInstance(String.class.ToType(),
 15);
        myTargetArray.SetValue("The", 0);
        myTargetArray.SetValue("quick", 1);
        myTargetArray.SetValue("brown", 2);
        myTargetArray.SetValue("fox", 3);
        myTargetArray.SetValue("jumped", 4);
        myTargetArray.SetValue("over", 5);
        myTargetArray.SetValue("the", 6);
        myTargetArray.SetValue("lazy", 7);
        myTargetArray.SetValue("dog", 8);

        // Displays the values of the target Array.
        Console.WriteLine("The target Array contains the following" 
            + " (before and after copying):");
        PrintValues(myTargetArray, ' ');

        // Copies the entire source Queue to the target Array,
        // starting at index 6.
        mySourceQ.CopyTo(myTargetArray, 6);

        // Displays the values of the target Array.
        PrintValues(myTargetArray, ' ');

        // Copies the entire source Queue to a new standard array.
        Object myStandardArray[] = mySourceQ.ToArray();

        // Displays the values of the new standard array.
        Console.WriteLine("The new standard array contains
 the following:");
        PrintValues(myStandardArray, ' ');
    } //main

    public static void PrintValues(Array
 myArr, char mySeparator)
    {
        IEnumerator e = myArr.GetEnumerator();
        while(e.MoveNext()) {
            Object myObj = e.get_Current(); 
            Console.Write("{0}{1}", System.Convert.ToString(mySeparator)
,
                System.Convert.ToString( myObj));
        }
        Console.WriteLine();
    } //PrintValues
} //SamplesQueue

/* 
 This code produces the following output.
 
 The target Array contains the following (before and after copying):
  The quick brown fox jumped over the lazy dog
  The quick brown fox jumped over three napping cats in the barn
 The new standard array contains the following:
  three napping cats in the barn
 */
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