Timer.Elapsed Evento

public:
 event System::Timers::ElapsedEventHandler ^ Elapsed;

public event System.Timers.ElapsedEventHandler Elapsed;

[System.Timers.TimersDescription("TimerIntervalElapsed")]
public event System.Timers.ElapsedEventHandler Elapsed;

member this.Elapsed : System.Timers.ElapsedEventHandler 

[<System.Timers.TimersDescription("TimerIntervalElapsed")>]
member this.Elapsed : System.Timers.ElapsedEventHandler 

Public Custom Event Elapsed As ElapsedEventHandler 

Tipo de evento

Atributos

TimersDescriptionAttribute

Ejemplos

En el ejemplo siguiente se crea una instancia de un Timer objeto que desencadena su Timer.Elapsed evento cada dos segundos (2000 milisegundos), se configura un controlador de eventos para el evento y se inicia el temporizador. El controlador de eventos muestra el valor de la ElapsedEventArgs.SignalTime propiedad cada vez que se genera.

using namespace System;
using namespace System::Timers;

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

public:
    static void Demo()
    {
        // Create a timer and set a two second interval.
        aTimer = gcnew System::Timers::Timer();
        aTimer->Interval = 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();
    }

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();
}
// The 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

using System;
using System.Timers;

public class Example
{
    private static Timer aTimer;

    public static void Main()
    {
        // Create a timer and set a two second interval.
        aTimer = new System.Timers.Timer();
        aTimer.Interval = 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();
    }

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

open System.Timers

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

// Create a timer and set a two second interval.
let aTimer = new Timer()
aTimer.Interval <- 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

// The 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

Imports System.Timers

Public Module Example
    Private aTimer As Timer

    Public Sub Main()
        ' Create a timer and set a two second interval.
        aTimer = New System.Timers.Timer()
        aTimer.Interval = 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()
    End Sub

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

Comentarios

El Elapsed evento se genera si la Enabled propiedad es true y el intervalo de tiempo (en milisegundos) definido por la Interval propiedad transcurre. Si la AutoReset propiedad es true, el evento se genera repetidamente en un intervalo definido por la Interval propiedad; de lo contrario, el evento se genera solo una vez, la primera vez que transcurre el Interval valor.

Si Interval se establece después de Timer que se haya iniciado, se restablece el recuento. Por ejemplo, si establece el intervalo en 5 segundos y, a continuación, se establece Enabledtrueen , se establece el recuento en el momento Enabled . Si restablece el intervalo en 10 segundos cuando el recuento es de 3 segundos, el Elapsed evento se genera por primera vez 13 segundos después Enabled de establecerse trueen .

Si la SynchronizingObject propiedad es null, el Elapsed evento se genera en un ThreadPool subproceso. Si el procesamiento del Elapsed evento dura más tiempo que Interval, es posible que el evento se genere de nuevo en otro ThreadPool subproceso. En esta situación, el controlador de eventos debe ser reentrant.

Incluso si SynchronizingObject no nulles , Elapsed los eventos pueden producirse después de llamar al Dispose método o Stop o después de que la Enabled propiedad se haya establecido falseen , porque la señal para generar el Elapsed evento siempre se pone en cola para su ejecución en un subproceso del grupo de subprocesos. Una manera de resolver esta condición de carrera es establecer una marca que indique al controlador de eventos que el Elapsed evento omita los eventos posteriores.

El Timer componente detecta y suprime todas las excepciones producidas por los controladores de eventos para el Elapsed evento. Este comportamiento está sujeto a cambios en futuras versiones de .NET Framework.

Se aplica a

Consulte también

• Interval
• AutoReset
• Elapsed
• ElapsedEventArgs
• ElapsedEventHandler
• Enabled