Timer Construtores
Definição
Sobrecargas
| Timer() |
Inicializa uma nova instância da classe Timer e define todas as propriedades para seus valores iniciais.Initializes a new instance of the Timer class, and sets all the properties to their initial values. |
| Timer(Double) |
Inicializa uma nova instância da classe Timer e define a propriedade Interval como o número especificado de milissegundos.Initializes a new instance of the Timer class, and sets the Interval property to the specified number of milliseconds. |
Timer()
public:
Timer();
public Timer ();
Public Sub New ()
Exemplos
O exemplo a seguir instancia 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.The following example instantiates a Timer object that fires its Timer.Elapsed event every two seconds (2000 milliseconds), sets up an event handler for the event, and starts the timer. O manipulador de eventos exibe o valor da ElapsedEventArgs.SignalTime Propriedade cada vez que é gerado.The event handler displays the value of the ElapsedEventArgs.SignalTime property each time it is raised.
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
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
Comentários
A tabela a seguir mostra os valores de propriedade inicial para uma instância do Timer .The following table shows initial property values for an instance of Timer.
| PropriedadeProperty | Valor inicialInitial value |
|---|---|
| AutoReset | true |
| Enabled | false |
| Interval | 100 milissegundos100 milliseconds |
| SynchronizingObject | Uma referência nula (Nothing no Visual Basic).A null reference (Nothing in Visual Basic). |
Confira também
Aplica-se a
Timer(Double)
public:
Timer(double interval);
public Timer (double interval);
new System.Timers.Timer : double -> System.Timers.Timer
Public Sub New (interval As Double)
Parâmetros
- interval
- Double
O tempo, em milissegundos, entre eventos.The time, in milliseconds, between events. O valor deve ser maior que zero e menor ou igual a MaxValue.The value must be greater than zero and less than or equal to MaxValue.
Exceções
O valor do parâmetro interval é menor ou igual a zero ou maior que MaxValue.The value of the interval parameter is less than or equal to zero, or greater than MaxValue.
Exemplos
O exemplo a seguir instancia 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.The following example instantiates a Timer object that fires its Timer.Elapsed event every two seconds (2000 milliseconds), sets up an event handler for the event, and starts the timer. O manipulador de eventos exibe o valor da ElapsedEventArgs.SignalTime Propriedade cada vez que é gerado.The event handler displays the value of the ElapsedEventArgs.SignalTime property each time it is raised.
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()
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()
Comentários
Esse construtor define a Interval propriedade da nova instância do temporizador, mas não habilita o timer.This constructor sets the Interval property of the new timer instance, but does not enable the timer.