Timer.Change 方法 (System.Threading) | Microsoft Learn

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public:
 bool Change(int dueTime, int period);

public bool Change (int dueTime, int period);

member this.Change : int * int -> bool

Public Function Change (dueTime As Integer, period As Integer) As Boolean

void CheckStatus(Object^ stateInfo) AutoResetEvent^ autoEvent = dynamic_cast<AutoResetEvent^>(stateInfo); Console::WriteLine("{0:h:mm:ss.fff} Checking status {1,2}.", DateTime::Now, ++invokeCount); if (invokeCount == maxCount) { // Reset the counter and signal the waiting thread. invokeCount = 0; autoEvent->Set(); ref class TimerExample public: static void Main() // Create an AutoResetEvent to signal the timeout threshold in the // timer callback has been reached. AutoResetEvent^ autoEvent = gcnew AutoResetEvent(false); StatusChecker^ statusChecker = gcnew StatusChecker(10); // Create a delegate that invokes methods for the timer. TimerCallback^ tcb = gcnew TimerCallback(statusChecker, &StatusChecker::CheckStatus); // Create a timer that invokes CheckStatus after one second, // and every 1/4 second thereafter. Console::WriteLine("{0:h:mm:ss.fff} Creating timer.\n", DateTime::Now); Timer^ stateTimer = gcnew Timer(tcb, autoEvent, 1000, 250); // When autoEvent signals, change the period to every half second. autoEvent->WaitOne(5000, false); stateTimer->Change(0, 500); Console::WriteLine("\nChanging period to .5 seconds.\n"); // When autoEvent signals the second time, dispose of the timer. autoEvent->WaitOne(5000, false); stateTimer->~Timer(); Console::WriteLine("\nDestroying timer."); int main() TimerExample::Main(); // The example displays output like the following: // 11:59:54.202 Creating timer. // 11:59:55.217 Checking status 1. // 11:59:55.466 Checking status 2. // 11:59:55.716 Checking status 3. // 11:59:55.968 Checking status 4. // 11:59:56.218 Checking status 5. // 11:59:56.470 Checking status 6. // 11:59:56.722 Checking status 7. // 11:59:56.972 Checking status 8. // 11:59:57.223 Checking status 9. // 11:59:57.473 Checking status 10. // Changing period to .5 seconds. // 11:59:57.474 Checking status 1. // 11:59:57.976 Checking status 2. // 11:59:58.476 Checking status 3. // 11:59:58.977 Checking status 4. // 11:59:59.477 Checking status 5. // 11:59:59.977 Checking status 6. // 12:00:00.478 Checking status 7. // 12:00:00.980 Checking status 8. // 12:00:01.481 Checking status 9. // 12:00:01.981 Checking status 10. // Destroying timer.


   using System;
using System.Threading;
class TimerExample
    static void Main()
        // Create an AutoResetEvent to signal the timeout threshold in the
        // timer callback has been reached.
        var autoEvent = new AutoResetEvent(false);
        var statusChecker = new StatusChecker(10);
        // Create a timer that invokes CheckStatus after one second, 
        // and every 1/4 second thereafter.
        Console.WriteLine("{0:h:mm:ss.fff} Creating timer.\n", 
                          DateTime.Now);
        var stateTimer = new Timer(statusChecker.CheckStatus, 
                                   autoEvent, 1000, 250);
        // When autoEvent signals, change the period to every half second.
        autoEvent.WaitOne();
        stateTimer.Change(0, 500);
        Console.WriteLine("\nChanging period to .5 seconds.\n");
        // When autoEvent signals the second time, dispose of the timer.
        autoEvent.WaitOne();
        stateTimer.Dispose();
        Console.WriteLine("\nDestroying timer.");
class StatusChecker
    private int invokeCount;
    private int  maxCount;
    public StatusChecker(int count)
        invokeCount  = 0;
        maxCount = count;
    // This method is called by the timer delegate.
    public void CheckStatus(Object stateInfo)
        AutoResetEvent autoEvent = (AutoResetEvent)stateInfo;
        Console.WriteLine("{0} Checking status {1,2}.", 
            DateTime.Now.ToString("h:mm:ss.fff"), 
            (++invokeCount).ToString());
        if(invokeCount == maxCount)
            // Reset the counter and signal the waiting thread.
            invokeCount = 0;
            autoEvent.Set();
// The example displays output like the following:
//       11:59:54.202 Creating timer.
//       11:59:55.217 Checking status  1.
//       11:59:55.466 Checking status  2.
//       11:59:55.716 Checking status  3.
//       11:59:55.968 Checking status  4.
//       11:59:56.218 Checking status  5.
//       11:59:56.470 Checking status  6.
//       11:59:56.722 Checking status  7.
//       11:59:56.972 Checking status  8.
//       11:59:57.223 Checking status  9.
//       11:59:57.473 Checking status 10.
//       Changing period to .5 seconds.
//       11:59:57.474 Checking status  1.
//       11:59:57.976 Checking status  2.
//       11:59:58.476 Checking status  3.
//       11:59:58.977 Checking status  4.
//       11:59:59.477 Checking status  5.
//       11:59:59.977 Checking status  6.
//       12:00:00.478 Checking status  7.
//       12:00:00.980 Checking status  8.
//       12:00:01.481 Checking status  9.
//       12:00:01.981 Checking status 10.
//       Destroying timer.
   
    Imports System.Threading
Public Module Example
    Public Sub Main()
        ' Use an AutoResetEvent to signal the timeout threshold in the
        ' timer callback has been reached.
        Dim autoEvent As New AutoResetEvent(False)
        Dim statusChecker As New StatusChecker(10)
        ' Create a timer that invokes CheckStatus after one second, 
        ' and every 1/4 second thereafter.
        Console.WriteLine("{0:h:mm:ss.fff} Creating timer." & vbCrLf, 
                          DateTime.Now)
        Dim stateTimer As New Timer(AddressOf statusChecker.CheckStatus, 
                                    autoEvent, 1000, 250)
        ' When autoEvent signals, change the period to every half second.
        autoEvent.WaitOne()
        stateTimer.Change(0, 500)
        Console.WriteLine(vbCrLf & "Changing period to .5 seconds." & vbCrLf)
        ' When autoEvent signals the second time, dispose of the timer.
        autoEvent.WaitOne()
        stateTimer.Dispose()
        Console.WriteLine(vbCrLf & "Destroying timer.")
    End Sub
End Module
Public Class StatusChecker
    Dim invokeCount, maxCount As Integer 
    Sub New(count As Integer)
        invokeCount  = 0
        maxCount = count
    End Sub
    ' The timer callback method.
    Sub CheckStatus(stateInfo As Object)
        Dim autoEvent As AutoResetEvent = DirectCast(stateInfo, AutoResetEvent)
        invokeCount += 1
        Console.WriteLine("{0:h:mm:ss.fff} Checking status {1,2}.", 
                          DateTime.Now, invokeCount)
        If invokeCount = maxCount Then
            ' Reset the counter and signal the waiting thread.
            invokeCount = 0
            autoEvent.Set()
        End If
    End Sub
End Class
' The example displays output like the following:
'       11:59:54.202 Creating timer.
'       11:59:55.217 Checking status  1.
'       11:59:55.466 Checking status  2.
'       11:59:55.716 Checking status  3.
'       11:59:55.968 Checking status  4.
'       11:59:56.218 Checking status  5.
'       11:59:56.470 Checking status  6.
'       11:59:56.722 Checking status  7.
'       11:59:56.972 Checking status  8.
'       11:59:57.223 Checking status  9.
'       11:59:57.473 Checking status 10.
'       Changing period to .5 seconds.
'       11:59:57.474 Checking status  1.
'       11:59:57.976 Checking status  2.
'       11:59:58.476 Checking status  3.
'       11:59:58.977 Checking status  4.
'       11:59:59.477 Checking status  5.
'       11:59:59.977 Checking status  6.
'       12:00:00.478 Checking status  7.
'       12:00:00.980 Checking status  8.
'       12:00:01.481 Checking status  9.
'       12:00:01.981 Checking status 10.
'       Destroying timer.
    
     回调方法在经过后
     
      dueTime
     
     调用一次，之后每次调用由
     
      period
     
     已用指定的时间间隔。
    




    

    
     如果
     
      dueTime
     
     为零 (0) ，则立即调用回调方法。 如果
     
      dueTime
     
     为
     
      Timeout.Infinite
     
     ，则永远不会调用回调方法;计时器已禁用，但可以通过调用
     
      Change
     
     并为 指定正值
     
      dueTime
     
     来重新启用。
    
    
     如果
     
      period
     
     为零 (0) 或
     
      Timeout.Infinite
     
     ，并且
     
      dueTime
     
     不是
     
      Timeout.Infinite
     
     ，则调用回调方法一次;计时器的定期行为被禁用，但可以通过调用
     
      Change
     
     并为 指定正值来
     
      period
     
     重新启用。
    
    
     
      Change
     
     可以从委托调用
     
      TimerCallback
     
     方法。
    
    public:
 bool Change(long dueTime, long period);
    public bool Change (long dueTime, long period);
    member this.Change : int64 * int64 -> bool
    Public Function Change (dueTime As Long, period As Long) As Boolean
    
     回调方法在经过后
     
      dueTime
     
     调用一次，之后每次调用由
     
      period
     
     已用指定的时间间隔。
    
    
     如果
     
      dueTime
     
     为零 (0) ，则立即调用回调方法。 如果
     
      dueTime
     
     为
     
      Timeout.Infinite
     
     ，则永远不会调用回调方法;计时器已禁用，但可以通过调用
     
      Change
     
     并为 指定正值
     
      dueTime
     
     来重新启用。
    
    
     如果
     
      period
     
     为零 (0) 或
     
      Timeout.Infinite
     
     ，并且
     
      dueTime
     
     不是
     
      Timeout.Infinite
     
     ，则调用回调方法一次;计时器的定期行为被禁用，但可以通过调用
     
      Change
     
     并为 指定正值来
     
      period
     
     重新启用。
    
    
     
      Change
     
     可以从委托调用
     
      TimerCallback
     
     方法。
    
    bool Change(TimeSpan dueTime, TimeSpan period);
   
   public:
 virtual bool Change(TimeSpan dueTime, TimeSpan period);
   public bool Change (TimeSpan dueTime, TimeSpan period);
   member this.Change : TimeSpan * TimeSpan -> bool
   abstract member Change : TimeSpan * TimeSpan -> bool
override this.Change : TimeSpan * TimeSpan -> bool
   Public Function Change (dueTime As TimeSpan, period As TimeSpan) As Boolean
   void CheckStatus( Object^ stateInfo )
      AutoResetEvent^ autoEvent = dynamic_cast<AutoResetEvent^>(stateInfo);
      Console::WriteLine( "{0} Checking status {1,2}.", DateTime::Now.ToString(  "h:mm:ss.fff" ), (++invokeCount).ToString() );
      if ( invokeCount == maxCount )
         // Reset the counter and signal main.
         invokeCount = 0;
         autoEvent->Set();
int main()
   AutoResetEvent^ autoEvent = gcnew AutoResetEvent( false );
   StatusChecker^ statusChecker = gcnew StatusChecker( 10 );
   // Create the delegate that invokes methods for the timer.
   TimerCallback^ timerDelegate = gcnew TimerCallback( statusChecker, &StatusChecker::CheckStatus );
   TimeSpan delayTime = TimeSpan(0,0,1);
   TimeSpan intervalTime = TimeSpan(0,0,0,0,250);
   // Create a timer that signals the delegate to invoke CheckStatus 
   // after one second, and every 1/4 second thereafter.
   Console::WriteLine( "{0} Creating timer.\n", DateTime::Now.ToString(  "h:mm:ss.fff" ) );
   Timer^ stateTimer = gcnew Timer( timerDelegate,autoEvent,delayTime,intervalTime );
   // When autoEvent signals, change the period to every 1/2 second.
   autoEvent->WaitOne( 5000, false );
   stateTimer->Change( TimeSpan(0), intervalTime + intervalTime );
   Console::WriteLine( "\nChanging period.\n" );
   // When autoEvent signals the second time, dispose of the timer.
   autoEvent->WaitOne( 5000, false );
   stateTimer->~Timer();
   Console::WriteLine( "\nDestroying timer." );
   
    using System;
using System.Threading;
class TimerExample
    static void Main()
        AutoResetEvent autoEvent     = new AutoResetEvent(false);
        StatusChecker  statusChecker = new StatusChecker(10);
        // Create the delegate that invokes methods for the timer.
        TimerCallback timerDelegate = 
            new TimerCallback(statusChecker.CheckStatus);
        TimeSpan delayTime = new TimeSpan(0, 0, 1);
        TimeSpan intervalTime = new TimeSpan(0, 0, 0, 0, 250);
        // Create a timer that signals the delegate to invoke 
        // CheckStatus after one second, and every 1/4 second 
        // thereafter.
        Console.WriteLine("{0} Creating timer.\n", 
            DateTime.Now.ToString("h:mm:ss.fff"));
        Timer stateTimer = new Timer(
            timerDelegate, autoEvent, delayTime, intervalTime);
        // When autoEvent signals, change the period to every 
        // 1/2 second.
        autoEvent.WaitOne(5000, false);
        stateTimer.Change(new TimeSpan(0), 
            intervalTime + intervalTime);
        Console.WriteLine("\nChanging period.\n");
        // When autoEvent signals the second time, dispose of 
        // the timer.
        autoEvent.WaitOne(5000, false);
        stateTimer.Dispose();
        Console.WriteLine("\nDestroying timer.");
class StatusChecker
    int invokeCount, maxCount;
    public StatusChecker(int count)
        invokeCount  = 0;
        maxCount = count;
    // This method is called by the timer delegate.
    public void CheckStatus(Object stateInfo)
        AutoResetEvent autoEvent = (AutoResetEvent)stateInfo;
        Console.WriteLine("{0} Checking status {1,2}.", 
            DateTime.Now.ToString("h:mm:ss.fff"), 
            (++invokeCount).ToString());
        if(invokeCount == maxCount)
            // Reset the counter and signal Main.
            invokeCount  = 0;
            autoEvent.Set();
    
     Imports System.Threading
Public Class TimerExample
    <MTAThread> _
    Shared Sub Main()
        Dim autoEvent As New AutoResetEvent(False)
        Dim statusChecker As New StatusChecker(10)
        ' Create the delegate that invokes methods for the timer.
        Dim timerDelegate As TimerCallback = _
            AddressOf statusChecker.CheckStatus
        Dim delayTime As New TimeSpan(0, 0, 1)
        Dim intervalTime As New TimeSpan(0, 0, 0, 0, 250)
        ' Create a timer that signals the delegate to invoke 
        ' CheckStatus after one second, and every 1/4 second 
        ' thereafter.
        Console.WriteLine("{0} Creating timer." & vbCrLf, _
            DateTime.Now.ToString("h:mm:ss.fff"))
        Dim stateTimer As Timer = New Timer( _
            timerDelegate, autoEvent, delayTime, intervalTime)
        ' When autoEvent signals, change the period to every 
        ' 1/2 second.
        autoEvent.WaitOne(5000, False)
        stateTimer.Change( _
            new TimeSpan(0), intervalTime.Add(intervalTime))
        Console.WriteLine(vbCrLf & "Changing period." & vbCrLf)
        ' When autoEvent signals the second time, dispose of 
        ' the timer.
        autoEvent.WaitOne(5000, False)
        stateTimer.Dispose()
        Console.WriteLine(vbCrLf & "Destroying timer.")
    End Sub
End Class
Public Class StatusChecker
    Dim invokeCount, maxCount As Integer 
    Sub New(count As Integer)
        invokeCount  = 0
        maxCount = count
    End Sub
    ' This method is called by the timer delegate.
    Sub CheckStatus(stateInfo As Object)
        Dim autoEvent As AutoResetEvent = _
            DirectCast(stateInfo, AutoResetEvent)
        invokeCount += 1
        Console.WriteLine("{0} Checking status {1,2}.", _
            DateTime.Now.ToString("h:mm:ss.fff"), _
            invokeCount.ToString())
        If invokeCount = maxCount Then
            ' Reset the counter and signal to stop the timer.
            invokeCount  = 0
            autoEvent.Set()
        End If
    End Sub
End Class
     
      回调方法在经过后
      
       dueTime
      
      调用一次，之后每次调用由
      
       period
      
      已用指定的时间间隔。
     
     
      如果
      
       dueTime
      
      为
      
       TimeSpan.Zero
      
      ，则立即调用回调方法。 如果
      
       dueTime
      
      为
      
       InfiniteTimeSpan
      
      ，则永远不会调用回调方法;计时器已禁用，但可以通过调用
      
       Change
      
      并为 指定正值
      
       dueTime
      
      来重新启用。
     
     
      如果
      
       period
      
      为
      
       TimeSpan.Zero
      
      或
      
       InfiniteTimeSpan
      
      ，并且
      
       dueTime
      
      为正数，则调用回调方法一次;计时器的定期行为被禁用，但可以通过调用
      
       Change
      
      并指定大于零的值来
      
       period
      
      重新启用。
     
     
      
       Change
      
      可以从委托调用
      
       TimerCallback
      
      方法。
     
     public:
 bool Change(System::UInt32 dueTime, System::UInt32 period);
     [System.CLSCompliant(false)]
public bool Change (uint dueTime, uint period);
     [<System.CLSCompliant(false)>]
member this.Change : uint32 * uint32 -> bool
     Public Function Change (dueTime As UInteger, period As UInteger) As Boolean
     
      回调方法在经过后
      
       dueTime
      
      调用一次，之后每次调用由
      
       period
      
      已用指定的时间间隔。
     
     
      如果
      
       dueTime
      
      为零 (0) ，则立即调用回调方法。 如果
      
       dueTime
      
      为
      
       Timeout.Infinite
      
      ，则永远不会调用回调方法;计时器已禁用，但可以通过调用
      
       Change
      
      并为 指定正值
      
       dueTime
      
      来重新启用。
     
     
      如果
      
       period
      
      为零 (0) 或
      
       Timeout.Infinite
      
      ，并且
      
       dueTime
      
      不是
      
       Timeout.Infinite
      
      ，则调用回调方法一次;计时器的定期行为被禁用，但可以通过调用
      
       Change
      
      并为 指定正值来
      
       period
      
      重新启用。
     
     
      
       Change
      
      可以从委托调用
      
       TimerCallback
      
      方法。