Timer Konstruktory
Definicja
Ważne
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Inicjuje nowe wystąpienie klasy Timer.
Przeciążenia
Timer() |
Inicjuje Timer nowe wystąpienie klasy i ustawia wszystkie właściwości na ich wartości początkowe. |
Timer(Double) |
Inicjuje Timer nowe wystąpienie klasy i ustawia Interval właściwość na określoną liczbę milisekund. |
Timer(TimeSpan) |
Inicjuje Timer nowe wystąpienie klasy, ustawiając Interval właściwość na określony okres. |
Timer()
- Źródło:
- Timer.cs
- Źródło:
- Timer.cs
- Źródło:
- Timer.cs
Inicjuje Timer nowe wystąpienie klasy i ustawia wszystkie właściwości na ich wartości początkowe.
public:
Timer();
public Timer ();
Public Sub New ()
Przykłady
Poniższy przykład tworzy wystąpienie Timer obiektu, który uruchamia zdarzenie Timer.Elapsed co dwie sekundy (2000 milisekund), konfiguruje procedurę obsługi zdarzeń dla zdarzenia i uruchamia czasomierz. Program obsługi zdarzeń wyświetla wartość ElapsedEventArgs.SignalTime właściwości za każdym razem, gdy jest wywoływana.
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
Uwagi
W poniższej tabeli przedstawiono początkowe wartości właściwości dla wystąpienia klasy Timer.
Właściwość | Wartość początkowa |
---|---|
AutoReset | true |
Enabled | false |
Interval | 100 milisekund |
SynchronizingObject | Odwołanie o wartości null (Nothing w Visual Basic). |
Zobacz też
Dotyczy
Timer(Double)
- Źródło:
- Timer.cs
- Źródło:
- Timer.cs
- Źródło:
- Timer.cs
public:
Timer(double interval);
public Timer (double interval);
new System.Timers.Timer : double -> System.Timers.Timer
Public Sub New (interval As Double)
Parametry
- interval
- Double
Czas , w milisekundach, między zdarzeniami. Wartość musi być większa niż zero i mniejsza niż lub równa Int32.MaxValue.
Wyjątki
Wartość parametru interval
jest mniejsza lub równa zero lub większa niż Int32.MaxValue.
Przykłady
Poniższy przykład tworzy wystąpienie Timer obiektu, który uruchamia zdarzenie Timer.Elapsed co dwie sekundy (2000 milisekund), konfiguruje procedurę obsługi zdarzeń dla zdarzenia i uruchamia czasomierz. Program obsługi zdarzeń wyświetla wartość ElapsedEventArgs.SignalTime właściwości za każdym razem, gdy jest wywoływana.
using System;
using System.Threading.Tasks;
using System.Timers;
class Example
{
static void Main()
{
Timer timer = new Timer(1000);
timer.Elapsed += async ( sender, e ) => await HandleTimer();
timer.Start();
Console.Write("Press any key to exit... ");
Console.ReadKey();
}
private static Task HandleTimer()
{
Console.WriteLine("\nHandler not implemented..." );
throw new NotImplementedException();
}
}
// The example displays output like the following:
// Press any key to exit...
// Handler not implemented...
//
// Unhandled Exception: System.NotImplementedException: The method or operation is not implemented.
// at Example.HandleTimer()
// at Example.<<Main>b__0>d__2.MoveNext()
// --- End of stack trace from previous location where exception was thrown ---
// at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<>c__DisplayClass2.<ThrowAsync>b__5(Object state)
// at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
// at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
// at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
// at System.Threading.ThreadPoolWorkQueue.Dispatch()
open System
open System.Threading.Tasks
open System.Timers
let handleTimer () =
printfn "\nHandler not implemented..."
raise (NotImplementedException()): Task
let timer = new Timer 1000
timer.Elapsed.AddHandler(fun sender e -> task { do! handleTimer () } |> ignore)
timer.Start()
printf "Press any key to exit... "
Console.ReadKey() |> ignore
// The example displays output like the following:
// Press any key to exit...
// Handler not implemented...
//
// Unhandled Exception: System.NotImplementedException: The method or operation is not implemented.
// at Example.HandleTimer()
// at Example.<<Main>b__0>d__2.MoveNext()
// --- End of stack trace from previous location where exception was thrown ---
// at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<>c__DisplayClass2.<ThrowAsync>b__5(Object state)
// at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
// at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
// at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
// at System.Threading.ThreadPoolWorkQueue.Dispatch()
Imports System.Threading.Tasks
Imports System.Timers
Public Module Example
Public Sub Main()
Dim timer As New Timer(1000)
AddHandler timer.Elapsed, AddressOf Example.HandleTimer
'timer.Elapsed = Async ( sender, e ) => await HandleTimer()
timer.Start()
Console.Write("Press any key to exit... ")
Console.ReadKey()
End Sub
Private Async Sub HandleTimer(sender As Object, e As EventArgs)
Await Task.Run(Sub()
Console.WriteLine()
Console.WriteLine("Handler not implemented..." )
Throw New NotImplementedException()
End Sub)
End Sub
End Module
' The example displays output like the following:
' Press any key to exit...
' Handler not implemented...
'
' Unhandled Exception: System.NotImplementedException: The method or operation is not implemented.
' at Example._Lambda$__1()
' at System.Threading.Tasks.Task.Execute()
' --- End of stack trace from previous location where exception was thrown ---
' at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
' at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
' at Example.VB$StateMachine_0_HandleTimer.MoveNext()
' --- End of stack trace from previous location where exception was thrown ---
' at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<>c__DisplayClass2.<ThrowAsync>b__5(Object state)
' at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
' at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
' at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
' at System.Threading.ThreadPoolWorkQueue.Dispatch()
Uwagi
Ten konstruktor ustawia Interval właściwość nowego wystąpienia czasomierza, ale nie włącza czasomierza.
Zobacz też
Dotyczy
Timer(TimeSpan)
- Źródło:
- Timer.cs
- Źródło:
- Timer.cs
- Źródło:
- Timer.cs
public:
Timer(TimeSpan interval);
public Timer (TimeSpan interval);
new System.Timers.Timer : TimeSpan -> System.Timers.Timer
Public Sub New (interval As TimeSpan)
Parametry
- interval
- TimeSpan
Czas między zdarzeniami. Wartość w milisekundach musi być większa niż zero i mniejsza niż lub równa MaxValue.