ElapsedEventArgs.SignalTime Propriedade
Importante
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Obtém a data/hora quando o Elapsed evento foi gerado.
public:
property DateTime SignalTime { DateTime get(); };
public DateTime SignalTime { get; }
member this.SignalTime : DateTime
Public ReadOnly Property SignalTime As DateTime
A hora que o Elapsed evento foi gerado.
O exemplo a seguir cria uma instância de um Timer objeto que dispara seu Timer.Elapsed evento a cada dois segundos (2000 milissegundos), configura um manipulador de eventos para o evento e inicia o temporizador. O manipulador de eventos exibe o valor da ElapsedEventArgs.SignalTime propriedade sempre que ela é gerada.
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
O Timer.Elapsed evento é gerado em um ThreadPool thread, portanto, o método de manipulação de eventos pode ser executado em um thread ao mesmo tempo em que uma chamada para o Timer.Stop método é executada em outro thread. Isso pode resultar na geração do Elapsed evento depois que o Stop método é chamado. Essa condição de corrida não pode ser evitada simplesmente comparando a SignalTime propriedade com a hora em que o Stop método é chamado, porque o método de manipulação de eventos pode já estar em execução quando o Stop método é chamado ou pode começar a ser executado entre o momento em que o Stop método é chamado e o momento em que o tempo de parada é salvo. Se for essencial impedir que o thread que chama o Stop método continue enquanto o método de manipulação de eventos ainda estiver em execução, use um mecanismo de sincronização mais robusto, como a Monitor classe ou o CompareExchange método . O código que usa o CompareExchange método pode ser encontrado no exemplo do Timer.Stop método .
Produto | Versões |
---|---|
.NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
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