Timer.Stop 方法
定义
重要
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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,显示 MessageBox 警报启动的次数计数,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。 在同一 Timer 应用程序会话中,可以多次启用和禁用对象。
通过调用禁用Timer后进行呼叫StartStop将导致Timer重启中断的间隔。 Timer如果设置为 5000 毫秒间隔,并且调用Stop时间约为 3000 毫秒,则调用Start将导致Timer引发Tick事件之前等待 5000 毫秒。
注释
对 Windows 窗体应用程序中的任何 Timer 组件调用 Stop 可能会导致应用程序中其他 Timer 组件的消息立即得到处理,因为所有 Timer 组件都在主应用程序线程上运行。 如果你有两Timer个组件,一个设置为 700 毫秒,一个设置为 500 毫秒,并且你首先Timer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。