Silverlight没有StopWatch。
那么你会用什么替代它呢?
我看到一些帖子上的人说要创建一个空动画,并从Storyboard类调用GetCurrentTime(),但我无法让它工作...
你会怎么做?
Silverlight没有StopWatch。
那么你会用什么替代它呢?
我看到一些帖子上的人说要创建一个空动画,并从Storyboard类调用GetCurrentTime(),但我无法让它工作...
你会怎么做?
这是我做的。它很简单并且对我非常有效:
long before = DateTime.Now.Ticks;
DoTheTaskThatNeedsMeasurement();
long after = DateTime.Now.Ticks;
TimeSpan elapsedTime = new TimeSpan(after - before);
MessageBox.Show(string.Format("Task took {0} milliseconds",
elapsedTime.TotalMilliseconds));
你只需要保持一个长变量来保存开始目标任务之前的总滴答数就行了。DateTime.UtcNow
。 - Yauralt文本 http://xmldocs.net/ball2/background.png
<Storyboard x:Name="Run" RepeatBehavior="Forever">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00"
Storyboard.TargetName="SecondHand" x:Name="SecondAnimation"
Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[2].(RotateTransform.Angle)" RepeatBehavior="Forever">
<SplineDoubleKeyFrame KeyTime="00:00:00" Value="0"/>
<SplineDoubleKeyFrame KeyTime="00:01:00" Value="360"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00"
Storyboard.TargetName="MinuteHand"
Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[2].(RotateTransform.Angle)" RepeatBehavior="Forever">
<SplineDoubleKeyFrame KeyTime="00:00:00" Value="0"/>
<SplineDoubleKeyFrame KeyTime="01:00:00" Value="360"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00"
Storyboard.TargetName="HourHand"
Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[2].(RotateTransform.Angle)" RepeatBehavior="Forever">
<SplineDoubleKeyFrame KeyTime="00:00:00" Value="0"/>
<SplineDoubleKeyFrame KeyTime="12:00:00" Value="360"/>
运行该故事板的代码如下:
private void RunWatch()
{
var time = DateTime.Now;
Run.Begin();
Run.Seek(new TimeSpan(time.Hour, time.Minute, time.Second));
}
DispatcherTimer _timer;
TimeSpan _time;
public Page()
{
InitializeComponent();
_timer = new DispatcherTimer();
_timer.Interval = new TimeSpan(0, 0, 0, 0, 10);
_timer.Tick += new EventHandler(OnTimerTick);
}
<StackPanel>
<Button Content="Start" x:Name="uiStart" Click="OnStartClick" />
<Button Content="Stop" x:Name="uiStop" Click="OnStopClick" />
<TextBlock x:Name="uiDisplay"/>
</StackPanel>
void OnTimerTick(object sender, EventArgs e)
{
_time = _time.Add(new TimeSpan(0, 0, 0, 0, 10));
display.Text = _time.ToString();
}
private void OnStartClick(object sender, RoutedEventArgs e)
{
_time = new TimeSpan(0,0,0,0,0);
_timer.Start();
}
private void OnStopClick(object sender, RoutedEventArgs e)
{
_timer.Stop();
}