ElapsedEventArgs.SignalTime Properti

Definisi

Ruang nama:

System.Timers

Rakitan:

netstandard.dll, System.ComponentModel.TypeConverter.dll

Sumber:

ElapsedEventArgs.cs

Mendapatkan tanggal/waktu saat Elapsed peristiwa dinaikkan.

public:
 property DateTime SignalTime { DateTime get(); };

public DateTime SignalTime { get; }

member this.SignalTime : DateTime

Public ReadOnly Property SignalTime As DateTime

Nilai Properti

DateTime

Waktu Elapsed acara dinaikkan.

Contoh

Contoh berikut membuat instans Timer objek yang menembakkan peristiwanya Timer.Elapsed setiap dua detik (2000 milidetik), menyiapkan penanganan aktivitas untuk peristiwa, dan memulai timer. Penanganan aktivitas menampilkan nilai ElapsedEventArgs.SignalTime properti setiap kali dinaikkan.

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

Keterangan

Peristiwa Timer.Elapsed dinaikkan pada ThreadPool utas, sehingga metode penanganan peristiwa mungkin berjalan pada satu utas pada saat yang sama saat panggilan ke Timer.Stop metode berjalan pada utas lain. Ini dapat mengakibatkan Elapsed peristiwa dinaikkan setelah metode dipanggil Stop . Kondisi balapan ini tidak dapat dicegah hanya dengan membandingkan SignalTime properti dengan waktu ketika Stop metode dipanggil, karena metode penanganan peristiwa mungkin sudah dijalankan ketika Stop metode dipanggil, atau mungkin mulai mengeksekusi antara saat ketika Stop metode dipanggil dan saat ketika waktu berhenti disimpan. Jika sangat penting untuk mencegah utas Stop yang memanggil metode untuk melanjutkan saat metode penanganan peristiwa masih dijalankan, gunakan mekanisme sinkronisasi yang lebih kuat seperti Monitor kelas atau CompareExchange metode . Kode yang menggunakan CompareExchange metode dapat ditemukan dalam contoh untuk Timer.Stop metode .

Lihat juga

• Stop()