private void btnProveri_Click(object sender, EventArgs e)
{
lblRezultat.Text = DateTime.Now.ToString();
timer1.Interval = 1800;
timer1.Start();
MessageBox.Show(DateTime.Now.ToString());
}
private void timer1_Tick(object sender, EventArgs e)
{
timer1.Enabled = true;
timer1.Interval = 1800;
}
I am a newbie trying to learn timers and this is my code above. I want to make a Timer which last 1,8 seconds. Then I call it inside the button when it's clicked and the first time the label is set to specific date and then i set interval to the timer and start it, but the messagebox outputs the same time (no delay at all).
That's because you're displaying the message box from within the same code that creates the timer. Effectively:
buttonClick:
Populate some text field.
Start timer so that it calls timerTick in 1.8 seconds
Display message box
timerTick:
Restart timer so it calls this function in 1.8 seconds.
As you can see, the message box is displayed at the time you press the button, not when the timer fires. When the timer fires, all you do is set it to fire again in another 1.8 seconds, but you don't actually do anything else at that point.
If you want it to display after the timer fires, it will have to be done in the timer function timer1_Tick. But you may want to be careful with that, it's possible you may end up with a rather large number of dialog boxes.
It looks like you want to do something like this:
private void btnProveri_Click(object sender, EventArgs e)
{
lblRezultat.Text = DateTime.Now.ToString();
var timer = new System.Timers.Timer(1800);
timer.Start();
timer.Elapsed += timer1_Tick;
}
private void timer1_Tick(object sender, System.Timers.ElapsedEventArgs e)
{
MessageBox.Show(DateTime.Now.ToString());
}
Here is working console example:
class Program
{
static void Main(string[] args)
{
Console.WriteLine("App started");
var timer = new System.Timers.Timer(1800);
timer.Start();
timer.Elapsed += timerHandler;
Console.ReadLine();
}
private static void timerHandler(object sender, System.Timers.ElapsedEventArgs e)
{
Messenger(DateTime.UtcNow.ToString());
}
private static void Messenger(string time)
{
Console.WriteLine(time);
}
}
Related
Here's my code
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
System.Timers.Timer myTimer = new System.Timers.Timer();
myTimer.Elapsed += new ElapsedEventHandler(DisplayTimeEvent);
myTimer.Interval = Convert.ToInt32(textBox5.Text);
if (checkBox1.Checked)
{
myTimer.Start();
}
else
{
myTimer.Stop();
}
}
It should stop repeating the function when unchecked, but it doesn't. What's wrong with it?
I recommend that you stop using System.Timers.Timer and start using a System.Windows.Forms.Timer component.
Begin by removing your myTimer-related code (the entire body of checkBox1_CheckedChanged will need to be replaced with code from below.)
Add a Timer component to your form using the designer and name it myTimer. This will add a System.Windows.Forms.Timer field to your form called myTimer.
Using the designer, set the Tick event handler of myTimer to DisplayTimeEvent. (Or add a new handler and replace its code with the code of your DisplayTimeEvent function.)
Then change your checkBox1_CheckedChange function to look like this:
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (int.TryParse(textBox5.Text, out int interval)) {
this.myTimer.Interval = interval;
}
this.myTimer.Enabled = checkBox1.Checked;
this.textBox5.Enabled = !checkBox1.Checked;
}
I also recommend adding the following handler to textBox5 to perform the bare minimum validation so you can't crash your app by entering an interval of 0 or the empty string, or some text that is not an integer.
private void textBox5_TextChanged(object sender, EventArgs e)
{
this.checkBox1.Enabled = (int.TryParse(textBox5.Text, out int interval) && interval > 0);
}
The System.Windows.Forms.Timer's Tick handler will be called in the UI thread, meaning it will be safe to do things like update labels of your form in that handler. In contrast to that, the System.Timers.Timer will be called on a worker thread and will require that you take on some some thread-management responsibilities you likely don't want to incur, such as invoking your UI updates back to the main UI thread. See Why there are 5 Versions of Timer Classes in .NET? for more info.
Everytime checkbox1 is changed, new Timer is created. When checkbox is ticked, created timer is active and will invoke DisplayTimeEvent forever. When checkbox is unticked, you stop another Timer, which was just created.
You need to create Timer only once (probably when form is created), or when checkbox1 is changed first time:
private System.Timers.Timer myTimer;
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (myTimer == null) {
myTimer = new System.Timers.Timer();
myTimer.Elapsed += new ElapsedEventHandler(DisplayTimeEvent);
myTimer.Interval = Convert.ToInt32(textBox5.Text);
}
if (checkBox1.Checked)
{
myTimer.Start();
}
else
{
myTimer.Stop();
}
}
This question is a bit obscure, however I cannot find an answer for it anywhere. I am writing a program in C# (Visual Studio Pro 2013) and I need to perform an action after the user has stopped typing for 2 seconds (setting the interval at 2000). I would need a standard timer for this however I need to detect when the user has stopped typing for 2 seconds. How would I go about doing this?
Here's the complete code:
public partial class Form1 : Form
{
System.Timers.Timer timer;
public Form1()
{
InitializeComponent();
// Initialize the timer.
timer = new System.Timers.Timer();
timer.Interval = 2000; // = 2 seconds; 1 second = 1000 miliseconds
timer.Elapsed += OnElapsed;
}
// Handles the TextBox.KeyUp event.
// The event handler was added in the designer via the Properties > Events > KeyUp
private void textBox1_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e)
{
// Reset the timer on each KeyUp.
timer.Stop();
timer.Start();
}
private void OnElapsed(object source, ElapsedEventArgs e)
{
// When time's up...
// - stop the timer first...
timer.Stop();
// - do something more...
MessageBox.Show("Time out!");
}
}
king.code's answer would be correct if you just reset the timer in the first line of textBox1_KeyUp event and initialize the timer in constructor or main method depending on usage.
System.Timers.Timer timer;
private void textBox1_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e)
{
timer.Stop();
timer.Start();
timer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
}
private static void OnTimedEvent(object source, ElapsedEventArgs e)
{
// Do something
}
I would recommend you go for class that inherits text box and pass timer into it if you are going to use it at multiple places
Try this:
System.Timers.Timer timer = new System.Timers.Timer(2000);;
timer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
timer.Enabled = false;
private void textBox1_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e)
{
timer.Enabled = false;
timer.Enabled = true;
}
private static void OnTimedEvent(object source, ElapsedEventArgs e)
{
// Do something
timer.Enabled = false;
}
That is easy just create a timer that sets to 2000 Ms and handle
It by the text change interveral .
Ex:
Set an integer that count from 0 to 2000 then increase it by the
Timer if user starts typing then reset the number else keep
Counting till reach 2000 an ping do the rusty homeboy helped;)
I have just found a valid answer that is simple and compact. I will explain it first and then show a code example. You need to start the timer disabled, and then you need to enable it as soon as the the user presses a key. Then, while still in the method for the user pressing the button you would need to reset the timer interval back to 2000. Whenever the timer expires, you do the action that needs to happen when the keyboard has been inactive for 2 seconds. Code example:
private void textBox_KeyPress(object sender, KeyPressEventArgs e)
{
this.timer.Enabled = true;
this.timer.Interval = 2000;
}
Now the method for the timer_Tick:
private void timer_Tick(object sender, EventArgs e)
{
//Do something when the keyboard has been inactive in 2 seconds
}
in visual studios c# windows form application, I have a timer which want it to stop after a movement but not straight away can you put in a 5 second delay in timer.stop(); if possible if not something similar.
private void timer1_Tick(object sender, EventArgs e)
{
pictureBox1.Top -= 1;
timer1.Stop();
}
You could use a counter to specify when to stop the timer: Initialize the counter with, say, 100, if your timer delay is 50ms and you want a "delay" of 5s. Then use
private void timer1_Tick(object sender, EventArgs e)
{
pictureBox1.Top -= 1;
counter--;
if (counter==0)
timer1.Stop();
}
You can use another timer-class: System.Timers.Timer
Initialize that one on 5 seconds, handle the Elapsed event, in wich you stop your first timer.
Be sure to make it thread safe!
Thread-Safe Calls to a Windows Forms Control
I did it like this, i dont think using a timer is the best option here but to satisfy your needs.
Thread runner;
private void button1_Click(object sender, EventArgs e)
{
timer1.Start();
timer1.Interval = 1000;
textBox1.Text = "Amazing"; // initial process
}
private void timer1_Tick(object sender, EventArgs e)
{
if (runner != null && runner.IsAlive)
return;
runner = new Thread(new ThreadStart(() =>
{
// run your process here
Thread.Sleep(5000);
StopRunner();
}));
runner.Start();
}
private void StopRunner()
{
timer1.Stop();
// post process here
}
What it does is it processes your actual request then it'll exit the timer after. I checked if the thread is alive so it wont reprocess it.
I am developing an application where i need the following requirement:
Suppose i have a button and a label (initially visibility set to false) in my form, and user clicks on the button, then the label should be displayed with some text that i assign to the label in the button click. But this label should be displayed only for some time, say some 3 secs and then it should automatically go invisible. For this if i gave:
private void button1_Click(object sender, EventArgs e)
{
label1.Visible=true;
label1.Text= "Magic";
Thread.Sleep(3000);
label1.Visible=false;
}
This code does not help the purpose. What is the approach to do it?
Try replacing the last two lines of your method with this:
System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
timer.Interval = 3000;
timer.Tick += (source, e) => {label1.Visible = false; timer.Stop();};
timer.Start();
Using Thread.Sleep() is never a good idea in WinForms; use timers instead.
Create a timer with 3s as Interval, start it, and set Visible to false in your timer Tick event. Also don't forget to stop the timer.
Never call Thread.Sleep in your UI thread: the application will be blocked as the UI thread won't accept messages (user click...) while sleeping.
// create a global _timer object
static Timer _timer; // From System.Timers
private void button1_Click(object sender, EventArgs e)
{
label1.Text = "Magic";
// Thread.Sleep(3000); // don't do Thread.Sleep()!
label1.Visible = false;
Start();
}
static void Start()
{
label1.Visible = true;
_timer = new Timer(3000); // Set up the timer for 3 seconds
_timer.Elapsed += new ElapsedEventHandler(_timer_Elapsed);
_timer.Enabled = true; // Enable it
}
static void _timer_Elapsed(object sender, ElapsedEventArgs e)
{
label1.Visible = false;
_timer.Stop();
}
Use Timer, perhaps Windows.Forms.Timer. You may have to play with enabling and disabling it when needed and not needed. Your current way does not help, coz your making the main UI thread to sleep. No use.
Currently I'm moving from java to c# and I'm full of crazy questions.
I'm trying new things on a windows form application and now,I would like to create a loop wich is executing a code every 1 minute,the problem is that I have no idea where to put this code.
For example,the form structure is like:
using System;
namespace Tray_Icon
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
notifyIcon1.ShowBalloonTip(5000);
}
private void notifyIcon1_BalloonTipClicked(object sender, EventArgs e)
{
label1.Text = "Baloon clicked!";
}
private void notifyIcon1_BalloonTipClosed(object sender, EventArgs e)
{
label1.Text = "baloon closed!";
}
private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
{
}
private void option1ToolStripMenuItem_Click(object sender, EventArgs e)
{
//some code here
}
private void option2ToolStripMenuItem_Click(object sender, EventArgs e)
{
//some code here
}
private void option3ToolStripMenuItem_Click(object sender, EventArgs e)
{
label1.Text = "Option 3 clicked!";
}
private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
{
option1ToolStripMenuItem_Click(this, null);
}
private void closeToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Close();
}
private void btnWrite_Click(object sender, EventArgs e)
{
//code here
}
}
}
Where should I put the loop code? :(
Thanks in advance for ANY replay!!!
Add a Timer to your form:
set its Interval property to 60000 (one minute in milliseconds) and Enabled to True:
and attach an event handler to the Timer.Tick event, e.g. by double-clicking the timer in the Forms designer:
private void timer1_Tick(object sender, EventArgs e)
{
// do something here. It will be executed every 60 seconds
}
You would have to add a timer, and set the interval to 1000 miliseconds, and in the OnTick event you add the code with your loop
Timer tmr = null;
private void StartTimer()
{
tmr = new Timer();
tmr.Interval = 1000;
tmr.Tick += new EventHandler<EventArgs>(tmr_Tick);
tmr.Enabled = true;
}
void tmr_Tick(object sender, EventArgs e)
{
// Code with your loop here
}
You can't put any loop code in here.
In your designer look for the Timer control. When you have that, configure it to run every minute and place your code in the Timer_Tick event.
Or create a timer manually in code and respond to the event :) But for starters, doing it by the designer is easier!
Drag a Timer component on the Form and doubleclick it. There you go with the code.
The Timer component runs in the main thread so you can modify UI components without worrying.
Alternatively You could create a System.Timers.Timer, which has it's own thread and has some advantages, but possible caveats when modifying UI components. See http://msdn.microsoft.com/en-us/library/system.timers.timer.aspx
Try to use Background Worker and put the code in the backgroundWorker.DoWork or use a Timer
Use System.Timers.Timer:
System.Timers.Timer aTimer;
{
aTimer = new System.Timers.Timer();
aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
aTimer.Interval = 60000;
aTimer.Enabled = true;
}
private static void OnTimedEvent(object source, ElapsedEventArgs e)
{
Console.WriteLine("The Elapsed event was raised at {0}", e.SignalTime);
}
for using Timer see this tutorial: C# Timer
How you do it in Java platform?
I think Java should be the same with .net.
In fact, a form program is just normal program which contains a event dispatcher. The event dispatcher listen to the UI events and dispatch them to the event handlers. I think all the UI mode should like this, no matter Java or .net platform.
So generally speaking, you have 2 options:
Start the loop at beginning. In this case, you should insert your
code in the constructor of the Form.
Start the loop when user
click the button. In this case, you should insert your code in the
event handler function.
Yes, as others mentioned, you should use the timer. But this should after you know where your code should locate. You also can use a endless loop with a sleep call. But timer is a better solution.
Idea of timer is more better. But If you want to use threads. Then Follow this
Let me assume that You want to do it right from the start of program
You can write in body of function (event in fact) named Form1_Load as
Your actual code is just within while loop other code only to guide
I can guide if you don't know the use of threads in C#
bool button2Clicked = false;
private void Form1_Load(object sender, EventArgs e)
{
// A good Way to call Thread
System.Threading.Thread t1 = new System.Threading.Thread(delegate()
{
while (!button2Clicked)
{
// Do Any Stuff;
System.Threading.Thread.Sleep(60000); //60000 Millieconds=1M
}
});
t1.IsBackground = true; // With above statement Thread Will automatically
// be Aborted on Application Exit
t1.Start();
}