Timer.Stop 方法

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

Source:

Timer.cs

停止计时器。

public:
 void Stop();

public void Stop ();

member this.Stop : unit -> unit

Public Sub Stop ()

示例

下面的代码示例实现一个简单的间隔计时器，该计时器每五秒设置一次警报。 发生警报时， MessageBox 显示警报已启动的次数，并提示用户计时器是否应继续运行。

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 )
      {
         
         // 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) {
          // 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

注解

还可以通过将 属性设置为 Enabledfalse来停止计时器。 对象可能在同一应用程序 Timer 会话中多次启用和禁用。

通过调用 Start 禁用 Timer 后调用 Stop 将导致 Timer 重启中断的间隔。 Timer如果将 设置为 5000 毫秒的间隔，并且调用Stop大约 3000 毫秒，则调用 Start 将导致 Timer 在引发Tick事件之前等待 5000 毫秒。

注意

在Windows 窗体应用程序中调用 Stop Timer 可能会导致来自应用程序中其他Timer组件的消息立即得到处理，因为所有组件都在Timermain应用程序线程上运行。 如果有两Timer个组件，一个设置为 700 毫秒，另一个设置为 500 毫秒，并在第一个 Timer上调用 Stop ，应用程序可能会首先收到第二个组件的事件回调。 如果这证明有问题，请考虑改用 Timer 命名空间中的 System.Threading 类。

另请参阅

• Enabled