StringEnumerator.Reset メソッド

.NET Framework クラス ライブラリ リファレンス

StringEnumerator.Reset メソッド

列挙子を初期位置、つまりコレクションの最初の要素の前に設定します。

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

Visual Basic (宣言)

Public Sub Reset

Visual Basic (使用法)

Dim instance As StringEnumerator

instance.Reset

C#

public void Reset ()

C++

public:
void Reset ()

J#

public void Reset ()

JScript

public function Reset ()

例外

例外の種類	条件
InvalidOperationException	列挙子が作成された後に、コレクションが変更されました。

解説

Reset は、列挙子をコレクションの先頭、つまり最初の要素の前に移動します。Reset を実行した後に、コレクションの最初の要素に列挙子を進めるには、Current の値を読み取る前に MoveNext を呼び出す必要があります。

使用例

StringEnumerator のプロパティとメソッドのいくつかの例を次に示します。

Visual Basic

Imports System
Imports System.Collections.Specialized

Public Class SamplesStringEnumerator

   Public Shared Sub Main()

      ' Creates and initializes a StringCollection.
      Dim myCol As New StringCollection()
      Dim myArr() As [String] = {"red",
 "orange", "yellow",
 "green", "blue", "indigo", "violet"}
      myCol.AddRange(myArr)

      ' Enumerates the elements in the StringCollection.
      Dim myEnumerator As StringEnumerator
 = myCol.GetEnumerator()
      While myEnumerator.MoveNext()
         Console.WriteLine("{0}", myEnumerator.Current)
      End While
      Console.WriteLine()

      ' Resets the enumerator and displays the first element again.
      myEnumerator.Reset()
      If myEnumerator.MoveNext() Then
         Console.WriteLine("The first element is {0}.",
 myEnumerator.Current)
      End If 

   End Sub 'Main

End Class 'SamplesStringEnumerator
 


'This code produces the following output.
'
'red
'orange
'yellow
'green
'blue
'indigo
'violet
'
'The first element is red.

C#

using System;
using System.Collections.Specialized;

public class SamplesStringEnumerator  {

   public static void Main()
  {

      // Creates and initializes a StringCollection.
      StringCollection myCol = new StringCollection();
      String[] myArr = new String[] { "red", "orange",
 "yellow", "green", "blue", "indigo", "violet"
 };
      myCol.AddRange( myArr );

      // Enumerates the elements in the StringCollection.
      StringEnumerator myEnumerator = myCol.GetEnumerator();
      while ( myEnumerator.MoveNext() )
         Console.WriteLine( "{0}", myEnumerator.Current );
      Console.WriteLine();

      // Resets the enumerator and displays the first element again.
      myEnumerator.Reset();
      if ( myEnumerator.MoveNext() )
         Console.WriteLine( "The first element is {0}.", myEnumerator.Current
 );

   }

}

/*
This code produces the following output.

red
orange
yellow
green
blue
indigo
violet

The first element is red.

*/

C++

#using <System.dll>

using namespace System;
using namespace System::Collections::Specialized;
int main()
{
   
   // Creates and initializes a StringCollection.
   StringCollection^ myCol = gcnew StringCollection;
   array<String^>^myArr = {"red","orange","yellow"
,"green","blue","indigo","violet"};
   myCol->AddRange( myArr );
   
   // Enumerates the elements in the StringCollection.
   StringEnumerator^ myEnumerator = myCol->GetEnumerator();
   while ( myEnumerator->MoveNext() )
      Console::WriteLine( "{0}", myEnumerator->Current );

   Console::WriteLine();
   
   // Resets the enumerator and displays the first element again.
   myEnumerator->Reset();
   if ( myEnumerator->MoveNext() )
      Console::WriteLine( "The first element is {0}.", myEnumerator->Current
 );
}

/*
This code produces the following output.

red
orange
yellow
green
blue
indigo
violet

The first element is red.

*/

J#

import System.* ;
import System.Collections.Specialized.* ;

public class SamplesStringEnumerator
{
    public static void main(String[]
 args)
    {
        // Creates and initializes a StringCollection.
        StringCollection myCol =  new StringCollection();
        String myArr[] = new String[]{"red", "orange",
 "yellow", "green", 
            "blue", "indigo", "violet"};
        myCol.AddRange(myArr);

        // Enumerates the elements in the StringCollection.
        StringEnumerator myEnumerator = myCol.GetEnumerator();
        while (myEnumerator.MoveNext()) {
            Console.WriteLine("{0}", myEnumerator.get_Current());
        }
        Console.WriteLine();

        // Resets the enumerator and displays the first element again.
        myEnumerator.Reset();
        if (myEnumerator.MoveNext()) {
            Console.WriteLine("The first element is {0}.", 
                myEnumerator.get_Current());
        }
    } //main 
} //SamplesStringEnumerator

/*
This code produces the following output.

red
orange
yellow
green
blue
indigo
violet

The first element is red.

*/

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
StringEnumerator クラス
StringEnumerator メンバ
System.Collections.Specialized 名前空間
MoveNext
Current
IEnumerator.Reset