ElapsedEventHandler Délégué

Définition

public delegate void ElapsedEventHandler(System::Object ^ sender, ElapsedEventArgs ^ e);

public delegate void ElapsedEventHandler(object sender, ElapsedEventArgs e);

public delegate void ElapsedEventHandler(object? sender, ElapsedEventArgs e);

type ElapsedEventHandler = delegate of obj * ElapsedEventArgs -> unit

Public Delegate Sub ElapsedEventHandler(sender As Object, e As ElapsedEventArgs)

Paramètres

Exemples

L’exemple de code suivant configure un gestionnaire d’événements pour l’événement Timer.Elapsed , crée un minuteur et démarre le minuteur. Le gestionnaire d’événements a la même signature que le ElapsedEventHandler délégué. Le gestionnaire d’événements affiche la SignalTime propriété chaque fois qu’elle est déclenchée.

// Use this code inside a project created with the Visual C++ > CLR > CLR Console Application template. 
// Replace the code in the default .cpp file with this code. 

#include "stdafx.h"
#using <system.dll>

using namespace System;

// To avoid confusion with other Timer classes, this sample always uses the fully-qualified
// name of System::Timers::Timer instead of a using statement for System::Timer.

public ref class Example
{
private:
    static System::Timers::Timer^ aTimer;

public:
    static void Demo()
    {
        // Normally, the timer is declared at the class level, so that it stays in scope as long as it
        // is needed. If the timer is declared in a long-running method, KeepAlive must be used to prevent
        // the JIT compiler from allowing aggressive garbage collection to occur before the method ends.
        // You can experiment with this by commenting out the class-level declaration and uncommenting 
        // the declaration below; then uncomment the GC.KeepAlive(aTimer) at the end of the method.        
        //System::Timers::Timer^ aTimer; 

        // Create a timer and set a two second interval.
        aTimer = gcnew System::Timers::Timer();
        aTimer->Interval = 2000;

        // Alternate method: create a Timer with an interval argument to the constructor.
        //aTimer = gcnew System::Timers::Timer(2000);

        // Hook up the Elapsed event for the timer. 
        aTimer->Elapsed += gcnew System::Timers::ElapsedEventHandler(Example::OnTimedEvent);

        // Have the timer fire repeated events (true is the default)
        aTimer->AutoReset = true;

        // Start the timer
        aTimer->Enabled = true;

        Console::WriteLine("Press the Enter key to exit the program at any time... ");
        Console::ReadLine();

        // If the timer is declared in a long-running method, use KeepAlive to prevent garbage collection
        // from occurring before the method ends.  
        //GC::KeepAlive(aTimer);
    }

private:
    static void OnTimedEvent(Object^ source, System::Timers::ElapsedEventArgs^ e)
    {
        Console::WriteLine("The Elapsed event was raised at {0}", e->SignalTime);
    }

};

int main()
{
    Example::Demo();
}

// This example displays output like the following: 
//       Press the Enter key to exit the program at any time... 
//       The Elapsed event was raised at 5/20/2015 8:48:58 PM 
//       The Elapsed event was raised at 5/20/2015 8:49:00 PM 
//       The Elapsed event was raised at 5/20/2015 8:49:02 PM 
//       The Elapsed event was raised at 5/20/2015 8:49:04 PM 
//       The Elapsed event was raised at 5/20/2015 8:49:06 PM

// Use this code inside a project created with the Visual C# > Windows Desktop > Console Application template.
// Replace the code in Program.cs with this code.

using System;

// To avoid confusion with other Timer classes, this sample always uses the fully-qualified
// name of System.Timers.Timer instead of a using statement for System.Timers.

public class Example
{
    private static System.Timers.Timer aTimer;

    public static void Main()
    {
        // Normally, the timer is declared at the class level, so that it stays in scope as long as it
        // is needed. If the timer is declared in a long-running method, KeepAlive must be used to prevent
        // the JIT compiler from allowing aggressive garbage collection to occur before the method ends.
        // You can experiment with this by commenting out the class-level declaration and uncommenting
        // the declaration below; then uncomment the GC.KeepAlive(aTimer) at the end of the method.
        //System.Timers.Timer aTimer;

        // Create a timer and set a two second interval.
        aTimer = new System.Timers.Timer();
        aTimer.Interval = 2000;

        // Alternate method: create a Timer with an interval argument to the constructor.
        //aTimer = new System.Timers.Timer(2000);

        // Create a timer with a two second interval.
        aTimer = new System.Timers.Timer(2000);

        // Hook up the Elapsed event for the timer.
        aTimer.Elapsed += OnTimedEvent;

        // Have the timer fire repeated events (true is the default)
        aTimer.AutoReset = true;

        // Start the timer
        aTimer.Enabled = true;

        Console.WriteLine("Press the Enter key to exit the program at any time... ");
        Console.ReadLine();

        // If the timer is declared in a long-running method, use KeepAlive to prevent garbage collection
        // from occurring before the method ends.
        //GC.KeepAlive(aTimer)
    }

    private static void OnTimedEvent(Object source, System.Timers.ElapsedEventArgs e)
    {
        Console.WriteLine("The Elapsed event was raised at {0}", e.SignalTime);
    }
}

// This example displays output like the following:
//       Press the Enter key to exit the program at any time...
//       The Elapsed event was raised at 5/20/2015 8:48:58 PM
//       The Elapsed event was raised at 5/20/2015 8:49:00 PM
//       The Elapsed event was raised at 5/20/2015 8:49:02 PM
//       The Elapsed event was raised at 5/20/2015 8:49:04 PM
//       The Elapsed event was raised at 5/20/2015 8:49:06 PM

// To avoid confusion with other Timer classes, this sample always uses the fully-qualified
// name of System.Timers.Timer instead of a using statement for System.Timers.
module Example

let mutable aTimer = new System.Timers.Timer()

let onTimedEvent source (e: System.Timers.ElapsedEventArgs) =
    printfn $"The Elapsed event was raised at {e.SignalTime}"

[<EntryPoint>]
let main _ =
    // Normally, the timer is declared at the class level, so that it stays in scope as long as it
    // is needed. If the timer is declared in a long-running method, KeepAlive must be used to prevent
    // the JIT compiler from allowing aggressive garbage collection to occur before the method ends.
    // You can experiment with this by commenting out the class-level declaration and uncommenting
    // the declaration below then uncomment the GC.KeepAlive(aTimer) at the end of the method.
    //System.Timers.Timer aTimer

    // Set a two second interval.
    aTimer.Interval <- 2000

    // Alternate method: create a Timer with an interval argument to the constructor.
    //aTimer = new System.Timers.Timer(2000)

    // Create a timer with a two second interval.
    aTimer <- new System.Timers.Timer(2000)

    // Hook up the Elapsed event for the timer.
    aTimer.Elapsed.AddHandler onTimedEvent

    // Have the timer fire repeated events (true is the default)
    aTimer.AutoReset <- true

    // Start the timer
    aTimer.Enabled <- true

    printfn "Press the Enter key to exit the program at any time... "
    stdin.ReadLine() |> ignore

    // If the timer is declared in a long-running method, use KeepAlive to prevent garbage collection
    // from occurring before the method ends.
    //GC.KeepAlive(aTimer)
    0

// This example displays output like the following:
//       Press the Enter key to exit the program at any time...
//       The Elapsed event was raised at 5/20/2015 8:48:58 PM
//       The Elapsed event was raised at 5/20/2015 8:49:00 PM
//       The Elapsed event was raised at 5/20/2015 8:49:02 PM
//       The Elapsed event was raised at 5/20/2015 8:49:04 PM
//       The Elapsed event was raised at 5/20/2015 8:49:06 PM

' Use this code inside a project created with the Visual Basic > Windows Desktop > Console Application template. 
' Replace the default code in Module1.vb with this code. Then right click the project in Solution Explorer, 
' select Properties, and set the Startup Object to Timer1. 

' To avoid confusion with other Timer classes, this sample always uses the fully-qualified
' name of System.Timers.Timer.

Public Class Module1

    Private Shared aTimer As System.Timers.Timer

    Public Shared Sub Main()
        ' Normally, the timer is declared at the class level, so that it stays in scope as long as it
        ' is needed. If the timer is declared in a long-running method, KeepAlive must be used to prevent
        ' the JIT compiler from allowing aggressive garbage collection to occur before the method ends.
        ' You can experiment with this by commenting out the class-level declaration and uncommenting 
        ' the declaration below; then uncomment the GC.KeepAlive(aTimer) at the end of the method.        
        'Dim aTimer As System.Timers.Timer 

        ' Create a timer and set a two second interval.
        aTimer = New System.Timers.Timer()
        aTimer.Interval = 2000

        ' Alternate method: create a Timer with an interval argument to the constructor.
        ' aTimer = New System.Timers.Timer(2000)

        ' Hook up the Elapsed event for the timer.  
        AddHandler aTimer.Elapsed, AddressOf OnTimedEvent

        ' Have the timer fire repeated events (true is the default)
        aTimer.AutoReset = True

        ' Start the timer
        aTimer.Enabled = True

        Console.WriteLine("Press the Enter key to exit the program at any time... ")
        Console.ReadLine()

        ' If the timer is declared in a long-running method, use KeepAlive to prevent garbage collection
        ' from occurring before the method ends. 
        'GC.KeepAlive(aTimer) 
    End Sub

    Private Shared Sub OnTimedEvent(source As Object, e As System.Timers.ElapsedEventArgs)
        Console.WriteLine("The Elapsed event was raised at {0}", e.SignalTime)
    End Sub
End Class

' This example displays output like the following: 
'       Press the Enter key to exit the program at any time... 
'       The Elapsed event was raised at 5/20/2015 8:48:58 PM 
'       The Elapsed event was raised at 5/20/2015 8:49:00 PM 
'       The Elapsed event was raised at 5/20/2015 8:49:02 PM 
'       The Elapsed event was raised at 5/20/2015 8:49:04 PM 
'       The Elapsed event was raised at 5/20/2015 8:49:06 PM

Remarques

Lorsque vous créez un ElapsedEventHandler délégué, vous identifiez la méthode qui gérera l’événement Timer.Elapsed . Pour associer l'événement au gestionnaire d'événements, ajoutez une instance du délégué à l'événement. Le gestionnaire d'événements est appelé chaque fois qu'un événement se produit, sauf si vous supprimez le délégué. Pour plus d’informations sur les délégués de gestionnaires d’événements, consultez Gestion et déclenchement d’événements.

Méthodes d’extension

S’applique à

Voir aussi

• Elapsed
• ElapsedEventArgs