.NET Framework 类库
Timer..::.Tick 事件

更新:2007 年 11 月

当指定的计时器间隔已过去而且计时器处于启用状态时发生。

命名空间:  System.Windows.Forms
程序集:  System.Windows.Forms(在 System.Windows.Forms.dll 中)

语法

Visual Basic(声明)
Public Event Tick As EventHandler
Visual Basic (用法)
Dim instance As Timer
Dim handler As EventHandler

AddHandler instance.Tick, handler
C#
public event EventHandler Tick
Visual C++
public:
 event EventHandler^ Tick {
    void add (EventHandler^ value);
    void remove (EventHandler^ value);
}
J#
/** @event */
public void add_Tick (EventHandler value)
/** @event */
public void remove_Tick (EventHandler value)
JScript
JScript 不支持事件。
备注

由于显示断言对话框可能导致 Windows 重复引发 Tick 事件,因此从 Tick 事件中的 Debug 类调用 Assert 方法可能出现意外的行为。建议避免测试该事件中的断言,并转为使用 WriteWriteIfWriteLineWriteLineIf 方法。

有关处理事件的更多信息,请参见使用事件

示例

下面的代码示例实现简单的间隔计时器,该计时器每五秒钟发一次警报。当发生警报时,MessageBox 显示该警报已启动次数的计数,并询问用户计时器是否应继续运行。

Visual Basic
Public Class Class1
    Private Shared 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, _
                                           myEventArgs As EventArgs)
        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.
        AddHandler myTimer.Tick, AddressOf 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()
        End While

    End Sub    

End Class

C#
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;
    }
 }

Visual C++
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();
}

J#
public class Class1
{
    private static System.Windows.Forms.Timer myTimer = 
        new System.Windows.Forms.Timer();
    private static int alarmCounter = 1;
    private static boolean 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).Equals(DialogResult.Yes)) {
            // Restarts the timer and increments the counter.
            alarmCounter += 1;
            myTimer.set_Enabled(true);
        }
        else {
            // Stops the timer.
            exitFlag = true;
        }
    } //TimerEventProcessor

    public static void main(String[] args)
    {
        /* Adds the event and the event handler for the method that will 
           process the timer event to the timer. 
         */
        myTimer.add_Tick(new EventHandler(TimerEventProcessor));

        // Sets the timer interval to 5 seconds.
        myTimer.set_Interval(5000);
        myTimer.Start();

        // Runs the timer, and raises the event.
        while (exitFlag == false) {
            // Processes all the events in the queue.
            Application.DoEvents();
        }
        return;
    } //main
} //Class1
平台

Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

.NET Framework 和 .NET Compact Framework 并不是对每个平台的所有版本都提供支持。有关支持的版本的列表,请参见.NET Framework 系统要求

版本信息

.NET Framework

受以下版本支持:3.5、3.0、2.0、1.1、1.0

.NET Compact Framework

受以下版本支持:3.5、2.0、1.0
另请参见

参考

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