Timer.Stop 方法

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

停止計時器。

public:
 void Stop();

public void Stop ();

member this.Stop : unit -> unit

Public Sub Stop ()

範例

下列程式碼範例會實作簡單的間隔計時器，每隔五秒設定一次警示。 當警示發生時，會顯示 MessageBox 警示已啟動的次數計數，並提示使用者是否應該繼續執行計時器。

public ref class Class1
{
private:
   static System::Windows::Forms::Timer^ myTimer = gcnew System::Windows::Forms::Timer;
   static int alarmCounter = 1;
   static bool exitFlag = false;

   // This is the method to run when the timer is raised.
   static void TimerEventProcessor( Object^ /*myObject*/, EventArgs^ /*myEventArgs*/ )
   {
      myTimer->Stop();
      
      // Displays a message box asking whether to continue running the timer.
      if ( MessageBox::Show( "Continue running?", String::Format( "Count is: {0}", alarmCounter ), MessageBoxButtons::YesNo ) == DialogResult::Yes )
      {
         
         // Restarts the timer and increments the counter.
         alarmCounter += 1;
         myTimer->Enabled = true;
      }
      else
      {
         
         // Stops the timer.
         exitFlag = true;
      }
   }


public:
   static void Main()
   {
      
      /* Adds the event and the event handler for the method that will 
                process the timer event to the timer. */
      myTimer->Tick += gcnew EventHandler( TimerEventProcessor );
      
      // Sets the timer interval to 5 seconds.
      myTimer->Interval = 5000;
      myTimer->Start();
      
      // Runs the timer, and raises the event.
      while ( exitFlag == false )
      {
         
         // Processes all the events in the queue.
         Application::DoEvents();
      }
   }

};

int main()
{
   Class1::Main();
}

public class Class1 {
    static System.Windows.Forms.Timer myTimer = new System.Windows.Forms.Timer();
    static int alarmCounter = 1;
    static bool exitFlag = false;
 
    // This is the method to run when the timer is raised.
    private static void TimerEventProcessor(Object myObject,
                                            EventArgs myEventArgs) {
       myTimer.Stop();
 
       // Displays a message box asking whether to continue running the timer.
       if(MessageBox.Show("Continue running?", "Count is: " + alarmCounter, 
          MessageBoxButtons.YesNo) == DialogResult.Yes) {
          // Restarts the timer and increments the counter.
          alarmCounter +=1;
          myTimer.Enabled = true;
       }
       else {
          // Stops the timer.
          exitFlag = true;
       }
    }
 
    public static int Main() {
       /* Adds the event and the event handler for the method that will 
          process the timer event to the timer. */
       myTimer.Tick += new EventHandler(TimerEventProcessor);
 
       // Sets the timer interval to 5 seconds.
       myTimer.Interval = 5000;
       myTimer.Start();
 
       // Runs the timer, and raises the event.
       while(exitFlag == false) {
          // Processes all the events in the queue.
          Application.DoEvents();
       }
    return 0;
    }
 }

Public Class Class1
    Private Shared WithEvents myTimer As New System.Windows.Forms.Timer()
    Private Shared alarmCounter As Integer = 1
    Private Shared exitFlag As Boolean = False    
    
    ' This is the method to run when the timer is raised.
    Private Shared Sub TimerEventProcessor(myObject As Object, _
                                           ByVal myEventArgs As EventArgs) _
                                       Handles myTimer.Tick
        myTimer.Stop()
        
        ' Displays a message box asking whether to continue running the timer.
        If MessageBox.Show("Continue running?", "Count is: " & alarmCounter, _
                            MessageBoxButtons.YesNo) = DialogResult.Yes Then
            ' Restarts the timer and increments the counter.
            alarmCounter += 1
            myTimer.Enabled = True
        Else
            ' Stops the timer.
            exitFlag = True
        End If
    End Sub
    
    Public Shared Sub Main()
        ' Adds the event and the event handler for the method that will
        ' process the timer event to the timer.
        
        ' Sets the timer interval to 5 seconds.
        myTimer.Interval = 5000
        myTimer.Start()
        
        ' Runs the timer, and raises the event.
        While exitFlag = False
            ' Processes all the events in the queue.
            Application.DoEvents()
        End While

    End Sub    

End Class

備註

您也可以將 屬性設定 Enabled 為 false 來停止計時器。 Timer物件可以在相同的應用程式會話內啟用和停用多次。

呼叫 之後， Timer 呼叫 Start 後呼叫 Stop 會導致 Timer 重新開機中斷的間隔。 Timer如果您的 設定為 5000 毫秒的間隔，而且您 Stop 大約呼叫 3000 毫秒，則呼叫 Start 會導致 Timer 在引發 Tick 事件之前等候 5000 毫秒。

注意

在Windows Forms應用程式內呼叫 Timer Stop 可能會導致應用程式中其他 Timer 元件的訊息立即處理，因為所有 Timer 元件都在主要應用程式執行緒上運作。 如果您有兩 Timer 個元件，一個設定為 700 毫秒，另一個設定為 500 毫秒，而您在第一 Timer 個 上呼叫 Stop ，您的應用程式可能會先收到第二個元件的事件回呼。 如果這證明有問題，請考慮改用 Timer 命名空間中的 System.Threading 類別。

另請參閱

• Enabled