I have a WPF application that includes a countdown timer, I'm stuck with the formatting part of it, I have little to no experience with programming and this is my first time using c#. I want to countdown from 15 minutes using DispatchTimer, but as of now, my timer only counts down from 15 seconds, any ideas?
My countdown timer so far:
public partial class MainWindow : Window
{
private int time = 15;
private DispatcherTimer Timer;
public MainWindow()
{
InitializeComponent();
Timer = new DispatcherTimer();
Timer.Interval = new TimeSpan(0,0,1);
Timer.Tick += Timer_Tick;
Timer.Start();
}
void Timer_Tick(object sender, EventArgs e) {
if (time > 0)
{
time--;
TBCountDown.Text = string.Format("{0}:{1}", time / 60, time % 60);
}
else {
Timer.Stop();
}
}
The output looks like this:
A better approach would be to do it with a TimeSpan rather than an int with a number. Setting the TimeSpan value in the following application will do the countdown as I want.
TimeSpan.FromMinutes for minutes
TimSpan.FromSeconds for seconds
You can check here for more detailed information.
public partial class MainWindow : Window
{
DispatcherTimer dispatcherTimer;
TimeSpan time;
public MainWindow()
{
InitializeComponent();
time = TimeSpan.FromMinutes(15);
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Interval = TimeSpan.FromSeconds(1);
dispatcherTimer.Tick += DispatcherTimer_Tick;
dispatcherTimer.Start();
}
private void DispatcherTimer_Tick(object sender, EventArgs e)
{
if (time == TimeSpan.Zero) dispatcherTimer.Stop();
else
{
time = time.Add(TimeSpan.FromSeconds(-1));
MyTime.Text = time.ToString("c");
}
}
}
Xaml Code
<Grid>
<TextBlock Name="MyTime" />
</Grid>
You initialise the DispatchTimer with an interval of 1 second: Timer.Interval = new TimeSpan(0,0,1);
And every TimerTick you decrement your timefield.
So, timeshould start of with the total number of seconds you want to count down. If you start with 15, your countdown timer will count down from 15 seconds to zero.
If you want it to count down for 15minutes, you have to initialise time to 900 (15 x 60'').
Related
I'm implementing a countdown in my app
private async void Window_Activated(object sender, WindowActivatedEventArgs args)
{
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += dispatcherTimer_Tick;
dispatcherTimer.Interval = new TimeSpan(0,1,0);
dispatcherTimer.Start();
}
private void dispatcherTimer_Tick(object sender, object e)
{
TimeSpan timeSpan = new TimeSpan(blockTime.Hours, blockTime.Minutes, blockTime.Seconds);
if (timeSpan != TimeSpan.Zero)
{
timeSpan = timeSpan.Subtract(TimeSpan.FromMinutes(1));
Countdown_TexBlock.Text = String.Format("{0}:{1}", timeSpan.Hours, timeSpan.Minutes);
dispatcherTimer.Start();
}
else
{
dispatcherTimer.Stop();
}
}
The code works but only one time
For example I put 15 minutes in the blocktime (the time that the countdown will be running)
after a minute the countdown.text would be 0:14.
So only works after the first minute
Is not supposed to be restarted with dispatcher.start()
In the code that you posted, I don't see the blockTime variable being changed to any other value than it has in the beginning. This means that on every tick of dispatchTimer the value of the timeSpan.Subtract expression will always evaluate to the same 14 minutes. In your code, that 14 minutes is assigned to a local vaiable that is disposed when the tick is over. This gives the appearance that the dispatchTimer has stopped issuing Tick when it hasn't.
Here's what I ran that works as expected (for testing, I changed the minutes to seconds to make it observable in a reasonable time).
public sealed partial class MainWindow : Window
{
public MainWindow()
{
this.InitializeComponent();
// Create the dispatch timer ONCE
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += DispatcherTimer_Tick;
dispatcherTimer.Interval = TimeSpan.FromSeconds(1);
// This will restart the timer every
// time the window is activated
this.Activated += (sender, e) =>
{
startOrRestartDispatchTimer();
};
}
private void startOrRestartDispatchTimer()
{
dispatcherTimer.Stop(); // If already running
blockTime = TimeSpan.FromSeconds(15);
Countdown_TexBlock.Text = blockTime.ToString();
dispatcherTimer.Start();
}
private void DispatcherTimer_Tick(object sender, object e)
{
if (blockTime > TimeSpan.Zero)
{
blockTime = blockTime.Subtract(TimeSpan.FromSeconds(1));
Countdown_TexBlock.Text = blockTime.ToString();
if (blockTime == TimeSpan.Zero)
{
Countdown_TexBlock.Text = "Done";
dispatcherTimer.Stop();
}
}
}
TimeSpan blockTime = TimeSpan.FromSeconds(15);
private DispatcherTimer dispatcherTimer;
// This will restart the timer when the button is clicked.
private void buttonRestart_Click(object sender, RoutedEventArgs e) =>
startOrRestartDispatchTimer();
}
I am writing a code in WPF & C# to display next sampling time in Date and time format.
For example, if sampling time is one minute and current time is 08:00 - the next sampling time should show 08:01, Next sampling time is displayed once 08:01 has passed.
I have tried using dispatcherTimer and sleep thread.
But when I use the whole WPF form freezes until next update.
Could you please help me?
code ->
public float samplingTime = 1;
public MainWindow()
{
InitializeComponent();
timer.Interval = TimeSpan.FromSeconds(1);
timer.Tick += timer_Tick;
timer.Start();
tboxSampling.Text = DateTime.Now.AddSeconds(samplingTime).ToString();
void timer_Tick(object sender, EventArgs e)
{
System.Threading.Thread.Sleep((int)samplingTime*1000);
tboxSampling.Text = DateTime.Now.AddSeconds(samplingTime).ToString();
}
}
I'd use the DispatcherTimer for such a problem:
public float samplingTime = 1;
public MainWindow()
{
dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
dispatcherTimer.Interval = new TimeSpan(0,0,1);
dispatcherTimer.Start();
}
private void dispatcherTimer_Tick(object sender, EventArgs e)
{
tboxSampling.Text = DateTime.Now.AddSeconds(samplingTime).ToString();
}
Timers are not guaranteed to execute exactly when the time interval occurs, but they are guaranteed to not execute before the time interval occurs.
This is my implementation of a Win Form app that has a countdown timer:
readonly DateTime myThreshold;
public Form1()
{
InitializeComponent();
myThreshold = Utils.GetDate();
Timer timer = new Timer();
timer.Interval = 1000; //1 second
timer.Tick += new EventHandler(t_Tick);
timer.Start();
//Threshold check - this only fires once insted of each second
if (DateTime.Now.CompareTo(myThreshold) > 0)
{
// STOP THE TIMER
timer.Stop();
}
else
{
//do other stuff
}
}
void t_Tick(object sender, EventArgs e)
{
TimeSpan timeSpan = myThreshold.Subtract(DateTime.Now);
this.labelTimer.Text = timeSpan.ToString("d' Countdown - 'hh':'mm':'ss''");
}
The wanted behavior is to stop the timer and the tick function when the threshold is reached.
This now does not happens because the check is only executed once since it is placed in the Form1 initialization.
Does exist a way to add this check in a way to immediately stop the Timer once a condition has been meet?
If we define timer as a class field (so it can be accessed from all methods in the class), then we can just add the check to the Tick event itself, and stop the timer from there:
private Timer timer = new Timer();
void t_Tick(object sender, EventArgs e)
{
// Stop the timer if we've reached the threshold
if (DateTime.Now > myThreshold) timer.Stop();
TimeSpan timeSpan = myThreshold.Subtract(DateTime.Now);
this.labelTimer.Text = timeSpan.ToString("d' Countdown - 'hh':'mm':'ss''");
}
I have the following timer implementation. But the timer is not running every 5 seconds as needed. How can make this run every 5 seconds. At present its running about once in 30 seconds.
private void button1_Click(object sender, RoutedEventArgs e)
{
msgsent = 0;
timer.Tick += timer_Tick;
timer.Interval = new TimeSpan(0, 0, 5);
bool isenable = timer.IsEnabled;
timer.Start();
}
private async void timer_Tick(object sender, object e)
{
if (geo == null)
{
geo = new Geolocator();
}
Geoposition posi = await geo.GetGeopositionAsync();
if (posi.Coordinate.Point.Position.Latitude <= 12.9227 && posi.Coordinate.Point.Position.Longitude >= 080.1320)
{
if (msgsent <=1)
{
msgsent = msgsent + 1;
ShowDialog(new MessageDialog("Your Bus has crossed xyz"));
}
}
}
I'll give you a hint. If you understand where each goes, then it should be clear. If not, you will once you get better.
// in the class definition
int msgsent;
Timer timer;
and
// in the constructor
timer = new Timer();
timer.Tick += timer_Tick;
timer.Interval = new TimeSpan(0, 0, 5);
and
// in the Button.Click event handler
timer.Start();
and
// in the Timer.Tick event handler
timer.Stop();
/* do your work here */
timer.Start();
There will be further issues when the user is clicking the button while you're doing your work, but that's beyond the scope of this question.
I need to count very fast for my Windows 8 Store Application. So i set the interval to 10 Ticks. As we have 10,000,000 ticks per second that should be enough. But i only get around 30 ticks as a result. How do i get a faster timer?
My code for the timer (and control timer):
int GLOBAL_counter = 0;
protected override void OnNavigatedTo(NavigationEventArgs e)
{
DispatcherTimer timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromTicks(10);
timer.Tick += timer_Tick;
timer.Start();
DispatcherTimer timerControl = new DispatcherTimer();
timerControl.Interval = TimeSpan.FromSeconds(1);
timerControl.Tick += timer_Tick_timerControl;
timerControl.Start();
}
private void timer_Tick(object sender, object e)
{
GLOBAL_counter++;
}
private void timer_Tick_timerControl(object sender, object e)
{
Label1.Text += GLOBAL_counter.ToString() + "\r\n";
GLOBAL_counter = 0;
}
From MSDN description of DispatcherTimer class:
Timers are not guaranteed to execute exactly when the time interval
occurs, but they are guaranteed to not execute before the time
interval occurs. This is because DispatcherTimer operations are placed
on the Dispatcher queue like other operations. When the
DispatcherTimer operation executes is dependent on the other jobs in
the queue and their priorities.