Stack.ToArrayとは? わかりやすく解説

Stack.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。

Stack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

public T[] ToArray ()
public:
array<T>^ ToArray ()
public T[] ToArray ()
public function ToArray () : T[]

戻り値
Stack要素コピー格納する新し配列

解説解説

要素は、Pop連続的な呼び出しによって返される要素順序同様に後入れ先出し (LIFO) の順序配列コピーされます。

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、Stack 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、既定容量文字列スタック作成しPush メソッド使用して 5 つ文字列スタックプッシュます。スタック要素列挙されますが、スタックの状態は変化しません。Pop メソッド使用して最初文字列スタックからポップます。Peek メソッド使用してスタック内の次の項目を調べてから、Pop メソッド使用してその項目をスタックからポップます。

ToArray メソッド使用して配列作成し、その配列スタック要素コピーしてから、IEnumerable を受け取Stack コンストラクタ配列渡して要素順序反転したスタックコピー作成しますコピー要素表示されます。

スタックの 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Stack コンストラクタ再度使用して要素順序反転したスタックコピー作成しますその結果3 つの null 要素末尾配置されます。

Contains メソッド使用して文字列 "four" がスタック最初コピーにあ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スタック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
 Stack(Of String)
        numbers.Push("one")
        numbers.Push("two")
        numbers.Push("three")
        numbers.Push("four")
        numbers.Push("five")

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

        Console.WriteLine(vbLf & "Popping '{0}'", numbers.Pop())
        Console.WriteLine("Peek at next item to pop: {0}",
 _
            numbers.Peek())    
        Console.WriteLine("Popping '{0}'", numbers.Pop())

        ' Create another stack, using the ToArray method and the
        ' constructor that accepts an IEnumerable(Of T). Note that
        ' the order of items on the new stack is reversed.
        Dim stack2 As New
 Stack(Of String)(numbers.ToArray())

        Console.WriteLine(vbLf & "Contents of the first copy:")
        For Each number As
 String In stack2
            Console.WriteLine(number)
        Next
        
        ' Create an array twice the size of the stack, compensating
        ' for the fact that Visual Basic allocates an extra array 
        ' element. Copy the elements of the stack, starting at the
        ' middle of the array. 
        Dim array2((numbers.Count * 2) - 1) As
 String
        numbers.CopyTo(array2, numbers.Count)
        
        ' Create a second stack, using the constructor that accepts
 an
        ' IEnumerable(Of T). The elements are reversed, with the null
        ' elements appearing at the end of the stack when enumerated.
        Dim stack3 As New
 Stack(Of String)(array2)

        Console.WriteLine(vbLf & _
            "Contents of the second copy, with duplicates and
 nulls:")
        For Each number As
 String In stack3
            Console.WriteLine(number)
        Next

        Console.WriteLine(vbLf & "stack2.Contains(""four"")
 = {0}", _
            stack2.Contains("four"))

        Console.WriteLine(vbLf & "stack2.Clear()")
        stack2.Clear()
        Console.WriteLine(vbLf & "stack2.Count = {0}",
 _
            stack2.Count)
    End Sub
End Module

' This code example produces the following output:
'
'five
'four
'three
'two
'one
'
'Popping 'five'
'Peek at next item to pop: four
'Popping 'four'
'
'Contents of the first copy:
'one
'two
'three
'
'Contents of the second copy, with duplicates and nulls:
'one
'two
'three
'
'
'
'
'stack2.Contains("four") = False
'
'stack2.Clear()
'
'stack2.Count = 0
using System;
using System.Collections.Generic;

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

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

        Console.WriteLine("\nPopping '{0}'", numbers.Pop());
        Console.WriteLine("Peek at next item to destack: {0}", 
            numbers.Peek());
        Console.WriteLine("Popping '{0}'", numbers.Pop());

        // Create a copy of the stack, using the ToArray method and
 the
        // constructor that accepts an IEnumerable<T>.
        Stack<string> stack2 = new Stack<string>(numbers.ToArray());

        Console.WriteLine("\nContents of the first copy:");
        foreach( string number in
 stack2 )
        {
            Console.WriteLine(number);
        }
        
        // Create an array twice the size of the stack and copy the
        // elements of the stack, starting at the middle of the 
        // array. 
        string[] array2 = new string[numbers.Count
 * 2];
        numbers.CopyTo(array2, numbers.Count);
        
        // Create a second stack, using the constructor that accepts
 an
        // IEnumerable(Of T).
        Stack<string> stack3 = new Stack<string>(array2);

        Console.WriteLine("\nContents of the second copy, with duplicates and
 nulls:");
        foreach( string number in
 stack3 )
        {
            Console.WriteLine(number);
        }

        Console.WriteLine("\nstack2.Contains(\"four\") = {0}",
 
            stack2.Contains("four"));

        Console.WriteLine("\nstack2.Clear()");
        stack2.Clear();
        Console.WriteLine("\nstack2.Count = {0}", stack2.Count);
    }
}

/* This code example produces the following output:

five
four
three
two
one

Popping 'five'
Peek at next item to destack: four
Popping 'four'

Contents of the first copy:
one
two
three

Contents of the second copy, with duplicates and nulls:
one
two
three




stack2.Contains("four") = False

stack2.Clear()

stack2.Count = 0
 */
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参照参照

Stack.ToArray メソッド

Stack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

要素は、Pop連続的な呼び出しによって返される要素順序同様に後入れ先出し (LIFO) の順序配列コピーされます。

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

Stack1 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

Public Class SamplesStack    
    
    Public Shared Sub Main()
        
        ' Creates and initializes the source Stack.
        Dim mySourceQ As New
 Stack()
        mySourceQ.Push("barn")
        mySourceQ.Push("the")
        mySourceQ.Push("in")
        mySourceQ.Push("cats")
        mySourceQ.Push("napping")
        mySourceQ.Push("three")
        
        ' 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 Stack 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 Stack 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    
    
    Overloads 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

End Class


' 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 SamplesStack  {

   public static void Main()
  {

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

      // 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 Stack 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 Stack 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 Stack.
   Stack^ mySourceQ = gcnew Stack;
   mySourceQ->Push( "barn" );
   mySourceQ->Push( "the" );
   mySourceQ->Push( "in" );
   mySourceQ->Push( "cats" );
   mySourceQ->Push( "napping" );
   mySourceQ->Push( "three" );

   // 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 Stack 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 Stack 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 SamplesStack
{
    public static void main(String[]
 args)
    {
        // Creates and initializes the source Stack.
        Stack mySourceQ = new Stack();

        mySourceQ.Push("barn");
        mySourceQ.Push("the");
        mySourceQ.Push("in");
        mySourceQ.Push("cats");
        mySourceQ.Push("napping");
        mySourceQ.Push("three");

        // 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 Stack 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 Stack 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 objEnum = myArr.GetEnumerator();
        while (objEnum.MoveNext()) {
            Console.Write("{0}{1}", 
                System.Convert.ToString(mySeparator), 
                System.Convert.ToString(objEnum.get_Current()));
        }
        Console.WriteLine();
    } //PrintValues

} //SamplesStack

/* 
 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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