Timer.Tick 事件
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
声明
Public Event Tick As EventHandler
用法
Dim instance As Timer
Dim handler As EventHandler
AddHandler instance.Tick, handler
public event EventHandler Tick
public:
event EventHandler^ Tick {
void add (EventHandler^ value);
void remove (EventHandler^ value);
}
/** @event */
public void add_Tick (EventHandler value)
/** @event */
public void remove_Tick (EventHandler value)
JScript 支持使用事件，但不支持进行新的声明。
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 Write、WriteIf、WriteLine 或 WriteLineIf 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。
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
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 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
{
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 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
.NET Compact Framework
受以下版本支持：2.0、1.0