I have a Windows Forms application where I need to have a timer working for 90 seconds and every second should be shown after it elapses, kind of like a stopwatch 1..2..3 etc, after 90 seconds is up, it should throw an exception that something is wrong.
I have the following code, but the RunEvent never fires.
private void ScanpXRF()
{
bool demo = false;
System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
try
{
for (int timerCounter = 0; timerCounter < 90; timerCounter++)
{
timer.Interval = 1000;
timer.Tick += new EventHandler(RunEvent);
timer.Start();
if(timerCounter == 89) {
throw new Exception();
}
}
}
catch (Exception e)
{
timer.Dispose();
MessageBox.Show("There is a problem!");
}
}
private void RunEvent(object sender, System.EventArgs e)
{
//boxStatus.AppendText("RunEvent() called at " + DateTime.Now.ToLongTimeString() + "\n");
MessageBox.Show("timer fired!");
}
Is there anything I am doing wrong here or are there other suggestions for other ways to achieve the same result?
A timer needs to be declared at the form level, or else it may not be disposed of when the form closes:
System.Windows.Forms.Timer timer;
int counter = 0;
Your starting code should just start the timer:
private void ScanpXRF()
{
counter = 0;
timer = new System.Windows.Forms.Timer();
timer.Interval = 1000;
timer.Tick += RunEvent;
timer.Start();
}
The RunEvent is your Tick event being called every second, so your logic needs to go in there:
private void RunEvent(object sender, EventArgs e)
{
counter++;
if (counter >= 90) {
timer.Stop();
// do something...
}
}
made it work
private void ScanpXRF()
{
_pXRFTimerCounter = 0;
pXRFTimer.Enabled = true;
pXRFTimer.Interval = 1000;
pXRFTimer.Elapsed += new ElapsedEventHandler(pXRFTimer_Tick);
pXRFTimer.Start();
}
private static void pXRFTimer_Tick(Object sender, EventArgs e)
{
_pXRFTimerCounter++;
if (_pXRFTimerCounter >= 90)
{
pXRFTimer.Stop();
// do something...
}
else
{
MessageBox.Show(_pXRFTimerCounter.ToString() + " seconds passed");
}
}
I made the timer
System.Timers
Related
I am trying to insert text to a lable, BUT the text has to be inserted slowly/character by character/letter by letter,
kinda like in old MUD games.
So far I have tried doing this:
private void StoryBox_Click(object sender, EventArgs e)
{
string text = StoryBox.Text;
var index = 0;
var timer = new System.Timers.Timer(2000);
timer.Elapsed += delegate
{
if (index < text.Length)
{
index++;
StoryBox.Text = "This should come out pretty slowly ";
}
else
{
timer.Enabled = false;
timer.Dispose();
}
};
timer.Enabled = true;
}
This is what I have gathered from the site but I don't particularly understand why this isn't working.
As you can see it's under StoryBox_Click.
Is there a way to automate this? So when the program is opened, it counts a couple seconds and THEN starts writing the text out.
Try this:
private async void button1_Click(object sender, EventArgs e)
{
string yourText = "This should come out pretty slowly";
label1.Text = string.Empty;
int i = 0;
for (i = 0; i <= yourText.Length - 1; i++)
{
label1.Text += yourText[i];
await Task.Delay(500);
}
}
You can use the Shown-Event of YourForm when you want to start it after your GUI has been opened.
So reusing your provided code and changing a few things this may work for you:
Add private fields to YourForm class:
private Timer _timer;
private int _index;
private string _storyText;
and initialising it in YourForm constructor
public YourForm()
{
InitializeComponent();
// init private fields;
this._index = 0;
this._storyText = "This should come out pretty slowly";
// Timer Interval is set to 1 second
this._timer = new Timer { Interval = 1000 };
// Adding EventHandler to Shown Event
this.Shown += this.YourForm_Shown;
this._timer.Tick += delegate
{
if (this._index < this._storyText.Length)
{
StoryBox.Text += this._storyText[this._index];
this._index++;
}
else
{
this._timer.Stop();
}
};
}
and the Shown event for YourForm:
private void YourForm_Shown(object sender, EventArgs e)
{
this._timer.Start();
}
So I just started learning C# and using forms. I have been able to create a digital clock and tinker with this and that, but now I'm trying to make a basic UI for a derpy game and my timer doesn't work.
First - what I'm trying to accomplish: A simple decrementing timer from 60 seconds (*clock style (mm:ss)).
Second, here's what I have:
public partial class Form1 : Form
{
private int counter = 60;
public Form1()
{
InitializeComponent();
label1.Text = TimeSpan.FromMinutes(1).ToString("m\\:ss");
}
private void pictureBox2_Click(object sender, EventArgs e)
{
}
private void timer1_Tick(object sender, EventArgs e)
{
counter--;
if (counter == 0)
{
timer1.Stop();
label1.Text = counter.ToString();
MessageBox.Show("Time's Up!!");
}
}
private void label1_Click(object sender, EventArgs e)
{
var startTime = DateTime.Now;
var counter = (TimeSpan.FromMinutes(1)).ToString("m\\:ss");
timer1 = new Timer();
timer1.Tick += new EventHandler(timer1_Tick);
timer1.Interval = 1000;
timer1.Start();
label1.Text = counter.ToString();
}
}
Appreciate the feedback and knowledge!
From the codes that I see, your timer is working but you are not updating it in each count, you are updating when the timer finishes -
private void timer1_Tick(object sender, EventArgs e)
{
counter--;
if (counter == 0)
{
timer1.Stop();
label1.Text = counter.ToString(); // *** Look here
MessageBox.Show("Time's Up!!");
}
}
You should update the timer in each tick, so take the update label code out of the if block -
private void timer1_Tick(object sender, EventArgs e)
{
counter--;
label1.Text = counter.ToString(); // should work
if (counter == 0)
{
timer1.Stop();
MessageBox.Show("Time's Up!!");
}
}
and also reset the counter in each cycle -
private void label1_Click(object sender, EventArgs e)
{
var startTime = DateTime.Now;
var counter = (TimeSpan.FromMinutes(1)).ToString("m\\:ss");
timer1 = new Timer();
timer1.Tick += new EventHandler(timer1_Tick);
timer1.Interval = 1000;
timer1.Start();
label1.Text = counter.ToString();
this.counter = 60
}
NOTE: I am really not sure if this code will throw any access
violation error, due to updating the UI in a different thread or not.
If so, then you have to use async/await or events/delegates to
update UI.
Let me know, if this throws error, then I will give you the async/await version.
This works fine for me. I would give progress updates as the time is countdown to show that it is working. For example, if you did this in label, you could do something like the following:
private void timer1_Tick(object sender, EventArgs e)
{
counter--;
label1.Text = counter.ToString();
if (counter == 0)
{
timer1.Stop();
MessageBox.Show("Time's Up!!");
}
}
Notice that the label1.Text = counter.ToString(); line has been moved before the counter == 0 check, so that it is able to provide feedback for all counter values.
As well, you may accidentally launch several timer1 instances if you do not keep track of how many you spawn using new Timer(). There are various ways to do this, but you could simply check whether timer1 already exists and counter == 0 before creating a new instance. You could perform this check as a guard clause (ie. return if either of those conditions are matched).
private void label1_Click(object sender, EventArgs e)
{
var startTime = DateTime.Now;
if (timer1 == null || (timer1 != null && counter == 0)) return;
counter = (TimeSpan.FromMinutes(1)).ToString("m\\:ss");
timer1 = new Timer();
timer1.Tick += new EventHandler(timer1_Tick);
timer1.Interval = 1000;
timer1.Start();
label1.Text = counter.ToString();
}
If you want this countdown to start automatically, you can put this directly into the constructor, or put it into another method and call it from the constructor like so:
public Form1()
{
InitializeComponent();
StartCountdown();
}
private void StartCountdown()
{
var startTime = DateTime.Now;
/* the rest of your original label1_Click code goes here ... */
}
I am trying to Update a timer asynchronously On a Button Click .
say example i have set the time = 60 seconds
and when i run the program after few TIME the timer has reached to 45 seconds and when i click the Button ,then it should add j=15 seconds to the time and the timer should change to 60 seconds asynchronously. Please Help
private int time = 60;
DateTime dt = new DateTime();
private j = 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--;
text.Text = TimeSpan.FromSeconds(time).ToString();
}
else
{
timer.Stop();
}
}
private void Button_Click(object sender, RoutedEventArgs e)
{
text.Text = dt.AddSeconds(j).ToString("HH:mm:ss");
}
Here is my code you can try it it's working.
private int time = 60;
DateTime dt = new DateTime();
private int j = 15;
private Timer timer1 = new Timer();
void timer_tick(object sender, EventArgs e)
{
if (time > 0)
{
time--;
text.Text = TimeSpan.FromSeconds(time).ToString();
}
else
{
timer1.Stop();
}
}
public timer()
{
InitializeComponent();
timer1 = new Timer();
timer1.Interval = 1000;
timer1.Tick += timer_tick;
timer1.Start();
}
private void button1_Click(object sender, EventArgs e)
{
time += j;
}
I made this code, but there is a delay between the time loop showing on the screen and the exact elapsed time.
Timer t = new Timer();
int time = 15;
string timestr;
t.Interval = 1000;
t.Tick += new EventHandler(Time);
void Time(object sender, EventArgs e)
{
if (time == 0)
{ time = 15; }
if (time != 0)
{
time--;
timestr = time.ToString();
label.Text = timestr;
}
}
My guess is that you are off by one second since the timer won't fire its first event until that interval value is reached.
A quick fix would be to fire the event yourself when you start it:
t.Start();
Time(t, EventArgs.Empty);
I think you need to try this. Add the line Application.DoEvents() just before the end of Time function.
void Time(object sender, EventArgs e)
{
if (time == 0)
{ time = 15; }
if (time != 0)
{
time--;
timestr = time.ToString();
label.Text = timestr;
}
Application.DoEvents();
}
How to display some messages on a C# form application with different time intervals with buttons?
Something like:
private void button1_Click(object sender, EventArgs e)
{
label1.Text = "string1";
[wait 3 seconds]
label1.Text = "string2";
[wait 5 sec]
label1.text="string 3";
[end]
}
You can create a new thread, change the label text, sleep that thread and so on so forth:
using System.Threading;
// Somewhere in your Form, for example in Form_Load event:
new Thread(new ThreadStart(delegate {
var d = new setLabelTextDelegate(setLabelText);
label1.Invoke(d, new object[] { "string 1" });
Thread.Sleep(3000); // sleep 3 seconds
label1.Invoke(d, new object[] { "string 2" });
Thread.Sleep(5000); // sleep 5 seconds
label1.Invoke(d, new object[] { "string 3" });
})).Start();
private delegate void setLabelTextDelegate(string text);
private void setLabelText(string text)
{
this.label1.Text = text;
}
Use a Timer with an interval of X milliseconds and update the UI each Timer Tick. Keep track of the number of Timer Ticks received so you'll know which string to use. After each update has been processed stop the Timer.
Other solutions posted might be wiser, but this one is pretty simple.
Form1 contains a simple Label called Label1 and a button called Button1
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
t.Interval = 100;
t.Tick += new EventHandler(t_Tick);
t.Start();
}
Timer t = new Timer();
int counter = 0;
private void Button1_Click(object sender, EventArgs e)
{
t.Start();
}
void t_Tick(object sender, EventArgs e)
{
try
{
t.Enabled = false; //Disable timer so we don't start t_Tick when t_Tick is still runnnig
if (counter == 0)
{
label1.Text = "string1";
t.Interval = 3000;
}
if (counter == 1)
{
label1.Text = "string2";
t.Interval = 5000;
}
if (counter == 2)
{
label1.Text = "string3";
t.Stop(); //Stop timer
}
else
{
t.Enabled = true; //Resume timer
}
counter++;
}
catch (Exception ex)
{
MessageBox.Show("Never throw exception from timer..." + ex.Message);
}
}
To do exactly as your pseudo code suggest simply use Thread.Sleep() in place of your [wait x] lines. Note that it will likely make UI unresponsive for the duration of waiting.
Alternatively you can create a thread that does the same thing but doesn't block the UI thread. The only issue there is that you have to define delegate in UI thread otherwise it wont work.
private void button1_Click(object sender, EventArgs e)
{
ThreadPool.QueueUserWorkItem(delegate()
{
label1.Text = "string1";
Thread.Sleep(3000);
label1.Text = "string2";
Thread.Sleep(5000);
//etc...
});
}
private void button1_Click(object sender, EventArgs e)
{
label1.Text = "string1";
System.Threading.Thread.Sleep(3*1000);
label1.Text = "string2";
System.Threading.Thread.Sleep(5*1000);
label1.text="string 3";
}
Thank you sooo much.
Oh i love stakoverflow.com
I did something like this.:)
Thank you all gentle mens :)
Please comment how did i do? I actually wanted it all happen in click of button.
public partial class mainForm : Form {
public mainForm()
Timer myTimer = new Timer();
private void button1_Click(object sender, EventArgs e)
{
myTimer.Tick += new EventHandler(myTimer_Tick);
myTimer.Interval = 2000;
myTimer.Start();
}
int counter=0;
void myTimer_Tick(object sender, EventArgs e)
{
if (counter == 0)
{
label4.Text = "string1";
myTimer.Interval = 2000;
}
if (counter == 1)
{
label4.Text = "string2";
myTimer.Interval = 2000;
}
if (counter == 2)
{
label4.Text = "string3";
myTimer.Stop();
}
else
{
myTimer.Enabled = true;
}
counter++;
} }
I made it all work with valuable examples you all provided . i put it all together and got it working as i wanted.
Once again Thank you all :)