Question

我不知道如何使用计时器或if语句。如何触发呢？然后让其他标签显示出来？

ten.biggest <- function(path) {
  Robject <- read.file(path)
  property_of_interest(x) %in% tail(sort(eval.parent(parse(text = values))), 10)
}

Answer 1

在您的TButton_Clicked内：

async void TButton_Clicked(object sender, System.EventArgs e)
{
    await Task.Delay(15000); // 15000ms == 15s
    T1Text.IsVisible = false;
}

我建议您阅读有关异步编程的更多信息。

Answer 2

您可以选择许多方法，例如：

1.System.Timers.Timer

private  void TButton_Clicked(object sender, EventArgs e)
    {
        System.Timers.Timer t = new System.Timers.Timer(15000);   // intial class Timer,set internal 15000ms；   
        t.Elapsed += new System.Timers.ElapsedEventHandler(doSometing2); //Execute events at time of arrival; 
        t.AutoReset = false;   //Set to execute (false) once and execute (true) all the time   
        t.Enabled = true;
    }

方法doSometing2

private void doSometing2(object sender, ElapsedEventArgs e)
    {
        Device.BeginInvokeOnMainThread(() =>
        {
            mLabel.IsVisible = false;
        });
    }

2。 Device.StartTimer

 private  void TButton_Clicked(object sender, EventArgs e)
    {
        Device.StartTimer(TimeSpan.FromSeconds(15), doSometing);
    }

方法doSometing

private bool doSometing()
    {
        Device.BeginInvokeOnMainThread(() =>
        {
            mLabel.IsVisible = false;
        });
        return true;
    }

3。 Thread.Sleep

private  void TButton_Clicked(object sender, EventArgs e)
    {
        Thread.Sleep(15000);
        mLabel.IsVisible = false;
    }

4。 Task.Delay

private async void TButton_Clicked(object sender, EventArgs e)
    {
        await Task.Delay(15000); // 15000ms == 15s
        mLabel.IsVisible = false;
    }

Answer 3

我这样做的方法，只需在该方法中添加StartTimer，它将在15秒后得到调用：

 Device.StartTimer(TimeSpan.FromSeconds(15), () =>
        {
            T1Text.IsVisible = false;
            return false;
        });

如果只希望发生一次（如JS的SetTimeout），则返回false；否则，如果希望每15秒发生一次，则返回true（如JS的SetInterval）。

Answer 4

public class StateToVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, 
                System.Globalization.CultureInfo culture)
        {
            if (value is State)
            {
                State state = (State)value;
                switch (state)
                {
                    case State.Away:
                    case State.Gone:
                        return Visibility.Visible;
                    default:
                        return Visibility.Collapsed;
                }
            }
        }
        enter code here
        public object ConvertBack(object value, Type targetType, object parameter, 
                System.Globalization.CultureInfo culture)
        {
            return State.None; // your default state
        }
    }

触发按钮15秒后，如何使标签不可见？

4 个答案: