ConsoleCancelEventHandler デリゲートとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

ConsoleCancelEventHandler デリゲート

メモ : このデリゲートは、.NET Framework version 2.0 で新しく追加されたものです。

System.Console の CancelKeyPress イベントを処理するメソッドを表します。

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

Visual Basic (宣言)

Public Delegate Sub ConsoleCancelEventHandler
 ( _
    sender As Object, _
    e As ConsoleCancelEventArgs _
)

Visual Basic (使用法)

Dim instance As New ConsoleCancelEventHandler(AddressOf
 HandlerMethod)

public delegate void ConsoleCancelEventHandler
 (
    Object sender,
    ConsoleCancelEventArgs e
)

C++

public delegate void ConsoleCancelEventHandler
 (
    Object^ sender, 
    ConsoleCancelEventArgs^ e
)

/** @delegate */
public delegate void ConsoleCancelEventHandler
 (
    Object sender, 
    ConsoleCancelEventArgs e
)

JScript

JScript では、デリゲートは使用できますが、新規に宣言することはできません。

パラメータ

sender: イベントのソース。

e: イベントデータを格納している System.ConsoleCancelEventArgs オブジェクト。

解説

ConsoleCancelEventHandler デリゲートを作成する場合は、イベントを処理するメソッドを識別してください。イベントをイベントハンドラに関連付けるには、デリゲートのインスタンスをイベントに追加します。デリゲートを削除しない限り、そのイベントが発生すると常にイベントハンドラが呼び出されます。イベントハンドラデリゲートの詳細については、「イベントとデリゲート」を参照してください。

使用例

ConsoleCancelEventHandler クラスを使用してイベントを処理する方法を示すコード例を次に示します。

Visual Basic

' This example demonstrates:
' the Console.CancelKeyPress event,
' the ConsoleCancelEventHandler delegate, 
' the ConsoleCancelEventArgs.SpecialKey property, and 
' the ConsoleCancelEventArgs.Cancel property.

Imports System

Class Sample
    Public Shared Sub Main()
 
        Dim cki As ConsoleKeyInfo
        
        ' Clear the screen.
        Console.Clear()
        
        ' Turn off the default system behavior when CTRL+C is pressed.
 When 
        ' Console.TreatControlCAsInput is false, CTRL+C is treated as
 an
        ' interrupt instead of as input.
        Console.TreatControlCAsInput = False
        
        ' Establish an event handler to process key press events.
        AddHandler Console.CancelKeyPress, AddressOf
 myHandler

        While True
            ' Prompt the user.
            Console.Write("Press any key, or 'X'
 to quit, or ")
            Console.WriteLine("CTRL+C to interrupt the read operation:")
            
            ' Start a console read operation. Do not display the input.
            cki = Console.ReadKey(True)
            
            ' Announce the name of the key that was pressed .
            Console.WriteLine("  Key pressed: {0}"
 & vbCrLf, cki.Key)
            
            ' Exit if the user pressed the 'X' key.
            If cki.Key = ConsoleKey.X Then
 Exit While
        End While
    End Sub 'Main
     
'   When you press CTRL+C, the read operation is interrupted and the
 
'   console cancel event handler, myHandler, is invoked. Upon entry
 
'   to the event handler, the Cancel property is false, which means
 
'   the current process will terminate when the event handler terminates.
 
'   However, the event handler sets the Cancel property to true, which
 
'   means the process will not terminate and the read operation will
 resume.

    Protected Shared Sub
 myHandler(ByVal sender As Object,
 _
                                   ByVal args As
 ConsoleCancelEventArgs) 
        ' Announce that the event handler has been invoked.
        Console.WriteLine(vbCrLf & "The read operation has
 been interrupted.")
        
        ' Announce which key combination was pressed.
        Console.WriteLine("  Key pressed: {0}", args.SpecialKey)
        
        ' Announce the initial value of the Cancel property.
        Console.WriteLine("  Cancel property: {0}",
 args.Cancel)
        
        ' Set the Cancel property to true to prevent the process from
 terminating.
        Console.WriteLine("Setting the Cancel property to true...")
        args.Cancel = True
        
        ' Announce the new value of the Cancel property.
        Console.WriteLine("  Cancel property: {0}",
 args.Cancel)
        Console.WriteLine("The read operation will resume..."
 & vbCrLf)
    
    End Sub 'myHandler
End Class 'Sample
'
'This code example produces results similar to the following text:
'
'Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:
'  Key pressed: J
'
'Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:
'  Key pressed: Enter
'
'Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:
'
'The read operation has been interrupted.
'  Key pressed: ControlC
'  Cancel property: False
'Setting the Cancel property to true...
'  Cancel property: True
'The read operation will resume...
'
'  Key pressed: Q
'
'Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:
'  Key pressed: X
'

// This example demonstrates:
// the Console.CancelKeyPress event,
// the ConsoleCancelEventHandler delegate, 
// the ConsoleCancelEventArgs.SpecialKey property, and 
// the ConsoleCancelEventArgs.Cancel property.

using System;

class Sample 
{
    public static void Main()
    {
    ConsoleKeyInfo cki;

// Clear the screen.
    Console.Clear();

// Turn off the default system behavior when CTRL+C is pressed. When
 
// Console.TreatControlCAsInput is false, CTRL+C is treated as an
// interrupt instead of as input.
    Console.TreatControlCAsInput = false;

// Establish an event handler to process key press events.
    Console.CancelKeyPress += new ConsoleCancelEventHandler(myHandler);
    while (true)
        {
// Prompt the user.
        Console.Write("Press any key, or 'X' to quit, or ");
        Console.WriteLine("CTRL+C to interrupt the read operation:");

// Start a console read operation. Do not display the input.
        cki = Console.ReadKey(true);

// Announce the name of the key that was pressed .
        Console.WriteLine("  Key pressed: {0}\n", cki.Key);

// Exit if the user pressed the 'X' key.
        if (cki.Key == ConsoleKey.X) break;
        }
    }

/*
   When you press CTRL+C, the read operation is interrupted and the 
   console cancel event handler, myHandler, is invoked. Upon entry 
   to the event handler, the Cancel property is false, which means
 
   the current process will terminate when the event handler terminates. 
   However, the event handler sets the Cancel property to true,
 which 
   means the process will not terminate and the read operation will resume.
*/
    protected static void
 myHandler(object sender, ConsoleCancelEventArgs args)
    {
// Announce that the event handler has been invoked.
    Console.WriteLine("\nThe read operation has been interrupted.");

// Announce which key combination was pressed.
    Console.WriteLine("  Key pressed: {0}", args.SpecialKey);

// Announce the initial value of the Cancel property.
    Console.WriteLine("  Cancel property: {0}", args.Cancel);

// Set the Cancel property to true to prevent the process from terminating.
    Console.WriteLine("Setting the Cancel property to true...");
    args.Cancel = true;

// Announce the new value of the Cancel property.
    Console.WriteLine("  Cancel property: {0}", args.Cancel);
    Console.WriteLine("The read operation will resume...\n");
    }
}
/*
This code example produces results similar to the following text:

Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:
  Key pressed: J

Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:
  Key pressed: Enter

Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:

The read operation has been interrupted.
  Key pressed: ControlC
  Cancel property: False
Setting the Cancel property to true...
  Cancel property: True
The read operation will resume...

  Key pressed: Q

Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:
  Key pressed: X

*/

C++

// This example demonstrates:
// the Console.CancelKeyPress event,
// the ConsoleCancelEventHandler delegate, 
// the ConsoleCancelEventArgs.SpecialKey property, and 
// the ConsoleCancelEventArgs.Cancel property.

using namespace System;

// When you press CTRL+C, the read operation is interrupted and the
 
// console cancel event handler, myHandler, is invoked. Upon entry 
// to the event handler, the Cancel property is false, which means 
// the current process will terminate when the event handler terminates.
 
// However, the event handler sets the Cancel property to true, which
 
// means the process will not terminate and the read operation will
 resume.
void OnCancelKeyPressed(Object^ sender, 
    ConsoleCancelEventArgs^ args)
{
    // Announce that the event handler has been invoked.
    Console::WriteLine("{0}The read operation has been interrupted.",
        Environment::NewLine);

    // Announce which key combination was pressed.
    Console::WriteLine("  Key pressed: {0}", args->SpecialKey);

    // Announce the initial value of the Cancel property.
    Console::WriteLine("  Cancel property: {0}", args->Cancel);

    // Set the Cancel property to true to prevent the process from 
    // terminating.
    Console::WriteLine("Setting the Cancel property to true...");
    args->Cancel = true;

    // Announce the new value of the Cancel property.
    Console::WriteLine("  Cancel property: {0}", args->Cancel);
    Console::WriteLine("The read operation will resume...{0}",
        Environment::NewLine);
}

int main()
{       
    // Clear the screen.
    Console::Clear();

    // Turn off the default system behavior when CTRL+C is pressed. When
 
    // Console.TreatControlCAsInput is false, CTRL+C is treated as an
    // interrupt instead of as input.
    Console::TreatControlCAsInput = false;

    // Establish an event handler to process key press events.
    Console::CancelKeyPress += 
        gcnew ConsoleCancelEventHandler(OnCancelKeyPressed);

    while (true)
    {
        // Prompt the user.
        Console::Write("Press any key, or 'X' to quit, or ");
        Console::WriteLine("CTRL+C to interrupt the read operation:");

        // Start a console read operation. Do not display the input.
        ConsoleKeyInfo^ keyInfo = Console::ReadKey(true);

        // Announce the name of the key that was pressed .
        Console::WriteLine("  Key pressed: {0}{1}", keyInfo->Key, 
            Environment::NewLine);

        // Exit if the user pressed the 'X' key.
        if (keyInfo->Key == ConsoleKey::X)
        {
            break;
        }
    }
}
/*
This code example produces results similar to the following text:

Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:
Key pressed: J

Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:
Key pressed: Enter

Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:

The read operation has been interrupted.
Key pressed: ControlC
Cancel property: False
Setting the Cancel property to true...
Cancel property: True
The read operation will resume...

Key pressed: Q

Press any key, or 'X' to quit, or CTRL+C to interrupt the read operation:
Key pressed: X

*/

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0

関連項目
System 名前空間

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ConsoleCancelEventHandler デリゲートとは？ わかりやすく解説

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ConsoleCancelEventHandler デリゲートとは？わかりやすく解説