I want my textbox1.Text to countdown for 30 minutes. So far I have this:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Timer timeX = new Timer();
timeX.Interval = 1800000;
timeX.Tick += new EventHandler(timeX_Tick);
}
void timeX_Tick(object sender, EventArgs e)
{
// what do i put here?
}
}
However I'm now stumped. I checked Google for answers but couldn't find one matching my question.
Here's a simple example similar to the code you posted:
using System;
using System.Windows.Forms;
namespace StackOverflowCountDown
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
textBox1.Text = TimeSpan.FromMinutes(30).ToString();
}
private void Form1_Load(object sender, EventArgs e) { }
private void textBox1_TextChanged(object sender, EventArgs e) { }
private void button1_Click(object sender, EventArgs e)
{
var startTime = DateTime.Now;
var timer = new Timer() { Interval = 1000 };
timer.Tick += (obj, args) =>
textBox1.Text =
(TimeSpan.FromMinutes(30) - (DateTime.Now - startTime))
.ToString("hh\\:mm\\:ss");
timer.Enabled = true;
}
}
}
Easiest thing you can do, is use a 1 minute timer:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace countdowntimer
{
public partial class Form1 : Form
{
private Timer timeX;
private int minutesLeft;
public Form1()
{
InitializeComponent();
timeX = new Timer(){Interval = 60000};
timeX.Tick += new EventHandler(timeX_Tick);
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
minutesLeft=30;
timeX.Start();
}
void timeX_Tick(object sender, EventArgs e)
{
if(minutesLeft--<=0)
{
timeX.Stop();
// Done!
}
else
{
// Not done yet...
}
textBox1.Text = minutesLeft + " mins remaining";
}
}
}
If all you want to do is set the value of your Texbox to count down from 30 Minutes. You will first need to change your timer interval to something smaller than 30Minutes. Something like timeX.Interval = 1000; which will fire every second. then set up your event like so:
int OrigTime = 1800;
void timeX_Tick(object sender, EventArgs e)
{
OrigTime--;
textBox1.Text = OrigTime/60 + ":" + ((OrigTime % 60) >= 10 ? (OrigTime % 60).ToString() : "0" + OrigTime % 60);
}
Also in your button click, you must add the following line: timeX.Enabled = true; In order to start the timer.
Your code will only get one event fired, once the 30 minutes has passed. In order to keep updating your UI continuously you'll have to make the events more frequent and add a condition inside the event handler to tell the count-down to stop once 30 minutes has passed.
You can do the time calculations easily by using TimeSpan and DateTime.
You'll also want to make sure your UI code runs on the UI thread, hence the Invoke.
timeX.Interval = 500;
...
TimeSpan timeSpan = TimeSpan.FromMinutes(30);
DataTime startedAt = DateTime.Now;
void timeX_Tick(object sender, EventArgs e)
{
if ((DateTime.Now - startedAt)<timeSpan){
Invoke(()=>{
TimeSpan remaining = timeSpan - (DateTime.Now - startedAt);
textBox.Text = remaining.ToString();
});
} else
timeX.Stop();
}
try this hope this will work for u
set timer interval=1000
minremain=1800000; //Should be in milisecond
timerplurg.satrt();
private void timerplurg_Tick(object sender, EventArgs e)
{
minremain = minremain - 1000;
string Sec = string.Empty;
string Min = string.Empty;
if (minremain <= 0)
{
lblpurgingTimer.Text = "";
timerplurg.Stop();
return;
}
else
{
var timeSpan = TimeSpan.FromMilliseconds(Convert.ToDouble(minremain));
var seconds = timeSpan.Seconds;
var minutes = timeSpan.Minutes;
if (seconds.ToString().Length.Equals(1))
{
Sec = "0" + seconds.ToString();
}
else
{
Sec = seconds.ToString();
}
if (minutes.ToString().Length.Equals(1))
{
Min = "0" + minutes.ToString();
}
else
{
Min = minutes.ToString();
}
string Totaltime = "Purge Remaing Time: " + Min + ":" + Sec;
lblpurgingTimer.Text = Totaltime;
}
}
Related
I am creating program to measure vacuum value with Arduino and display it in the form that created with C#.
I want to store time as an constant. It is starting time of the program. I assigned it with "Connect" button. When I clicked, time value is storing.
Then I am using "timer tick" method to see measured values instantly. Also, DateTime.Now shows me instant system time. It is changing like a clock.
click here to see the picture
Here is the Connect button's code;
public void button1_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
try
{
if (comboBox1.Text == "")
{
MessageBox.Show("Please select the port name!");
}
else
{
serialPort1.PortName = comboBox1.Text;
serialPort1.ReadBufferSize = 8;
serialPort1.Open();
timeval.Clear();
button1.Enabled = false;
button2.Enabled = true;
timer1.Start();
DateTime myDateTime = DateTime.Now; //It stores the instant time information when button is clicked.
label14.Text = myDateTime.ToString(); // shows in the label
//serialPort1.ReadTimeout = 300;
}
}
catch (UnauthorizedAccessException)
{
MessageBox.Show("Unauthorized Access!");
}
}
Here is the timer tick's code;
public void timer1_Tick(object sender, EventArgs e)
{
label12.Text = DateTime.Now.ToString();
//TimeSpan time_difference = DateTime.Now - myDateTime; // trying to calculate time difference.
//double saniye = time_difference.Seconds;
//double dakika = time_difference.Minutes;
//label10.Text = (Math.Round(saniye)).ToString();
//label16.Text = (Math.Round(dakika)).ToString();
new_data = 756 * (float.Parse(data) - 1023) / 1023;
sensorval.Add(Math.Round(new_data, 1));
all_data.Add(Math.Round(new_data, 1));
textBox1.Text = Convert.ToString(Math.Round(new_data, 2));
all_data.Sort();
var peak_vacuum = all_data[0];
textBox4.Text = peak_vacuum.ToString();
if (sensorval.Count % 100 == 0)
{
sensorval.Sort();
var find_max = sensorval[0];
var find_min = sensorval[sensorval.Count - 1];
textBox3.Text = find_min.ToString();
textBox2.Text = find_max.ToString();
sensorval.RemoveRange(0, 99);
}
}
I could not calculate time difference because myDateTime variable is calculating in button2 and defined in button2 method. But DateTime.Now is defined in timer tick method. So, I am getting an error that "The name 'myDateTime' does not exist in the current content." in the timer tick method.
By the way, I tried to use counter in the timer tick to see the seconds after program works. It was not so accurate. It was slower then the real time. So, I choose above method.
Thank you in advance.
I thinks its like what you want.
public partial class Form1 : Form
{
// accessable from all methods, events on Form1
private DateTime myDateTime;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
myDateTime = DateTime.Now;
// other codes
}
private void timer1_Tick(object sender, EventArgs e)
{
// other codes
}
private void button2_Click(object sender, EventArgs e)
{
// other codes
var diffrenceSpan = DateTime.Now - myDateTime;
var hours = diffrenceSpan.Hours;
var minutes = diffrenceSpan.Minutes;
var seconds = diffrenceSpan.Seconds;
}
}
gits project links
This timer fires as expected when it is set to 3 seconds, 10 seconds, 60 seconds, 10 minutes, 20 minutes but stops working when set to 30 minutes. It's just a simple app that pops up on my screen to remind me to do various tasks. I've seen posts about instead using System Timers, Threading Timer, and Forms Timer. But, since this particular application is meant to actually interact with a UI, I thought Forms Timer was the way to go. Also, the code seems to work perfectly fine for times lower than 30 minutes.
using System;
using System.Windows.Forms;
namespace WindowsFormsApp1
{
public partial class Form1 : Form
{
static int thirtyMins = 30 * 60 * 1000;
static int runTime = thirtyMins;
static int minTotal = 0;
public Form1()
{
InitializeComponent();
}
public void updateLabels()
{
label1.Text = "shown " + DateTime.Now.ToString("h:mm:ss tt");
label2.Text = runTime / 1000 + " sec";
label3.Text = "hidden " + minTotal;
}
private void Form1_Load(object sender, EventArgs e)
{
timer1.Interval = thirtyMins * 1000;
timer1.Enabled = true;
updateLabels();
Console.WriteLine(DateTime.Now.ToString("h:mm:ss tt") + " Loaded!!");
}
private void timer1_Tick(object sender, EventArgs e)
{
updateLabels();
this.WindowState = FormWindowState.Normal;
this.Activate();
this.Update();
Console.WriteLine(DateTime.Now.ToString("h:mm:ss tt") + " Tick!!");
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
try
{
if (textBox1.Text.Contains("*"))
{
int sec = 1;
String[] split = textBox1.Text.Split('*');
foreach (string s in split)
{
sec *= Int32.Parse(s.Trim());
}
runTime = sec * 1000;
}
else
{
runTime = Int32.Parse(textBox1.Text.Trim()) * 1000;
}
timer1.Interval = runTime;
updateLabels();
}
catch
{
timer1.Interval = thirtyMins;
}
}
private void Form1_Resize(object sender, EventArgs e)
{
if (WindowState == FormWindowState.Minimized)
{
minTotal++;
updateLabels();
}
}
}
}
How do I randomly generate integer values in a text box for every one second till I click on a button.
I came up with following code (Clicking on Button 1 should generate random integers for every 1 second in textBox1 till Button2 is clicked) and its not working (Output is empty text box).
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Timers;
namespace WindowsFormsApplication5
{
public partial class Form1 : Form
{
bool buttonclicked = false;
System.Timers.Timer myTimer;
System.Random r = new System.Random();
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
while (buttonclicked == false)
{
myTimer = new System.Timers.Timer();
myTimer.Elapsed += new ElapsedEventHandler(rnd);
myTimer.Interval = 1000;
myTimer.Start();
}
}
public void rnd(Object sender, EventArgs e)
{
textBox1.Text = r.Next(0, 1000).ToString();
}
private void button2_Click(object sender, EventArgs e)
{
buttonclicked = true;
myTimer.Stop();
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
}
}
Your while(buttonclicked == false) will create an infinite loop once you click the button.You can just do
private void button1_Click_1(object sender, EventArgs e)
{
myTimer = new System.Timers.Timer();
myTimer.Elapsed += new System.Timers.ElapsedEventHandler(rnd);
myTimer.Interval = 1000;
myTimer.Start();
}
private void button2_Click_1(object sender, EventArgs e)
{
myTimer.Stop();
}
and you need to make a safe thread call to the textbox by doing :
delegate void SetTextCallback(string text);
private void SetText(string text)
{
if (this.textBox1.InvokeRequired)
{
SetTextCallback d = new SetTextCallback(SetText);
this.Invoke(d, new object[] { text });
}
else
{
this.textBox1.Text = text;
}
}
And to set the text just use SetText(r.Next(0 ,1000).ToString());
Looks like it is because you are using a while loop instead of an if block. Your condition should look like this:
if( buttonclicked == false)
{
....
}
I think you were right to a loop - but not the timer.
No need to declare the System.Random at the class level either - unless you're using it elsewhere.
Using a for loop.
private void button1_Click_1(object sender, EventArgs e)
{
var r = new System.Random();
for (var i = 0; i < 1000; i++)
{
textBox1.Text = r.Next(0, 1000).ToString();
}
}
Using a while loop.
private void button1_Click_1(object sender, EventArgs e)
{
var r = new System.Random();
var i = 0;
while (i < 1000)
{
textBox1.Text = r.Next(0, 1000).ToString();
i++;
}
}
If you really want to add a new number each second, you could use async and await (to stop UI blocking) and add a System.Threading.Thread.Sleep(1000);.
Or even Task based would be better than a Timer (in my opinion). It's good to understand how Tasks work.
A Timer is okay for this scenario - but in real applications they can get messy, especially with multiple timers.
Here is an example of how the above would work using Tasks.
private void button1_Click(object sender, EventArgs e)
{
var uiScheduler = TaskScheduler.FromCurrentSynchronizationContext();
Task.Factory.StartNew(() => AddRandomNumbers(uiScheduler));
}
private async Task AddRandomNumbers(TaskScheduler uiScheduler)
{
var r = new Random();
for (int i = 0; i < 1000; i++)
{
await Task.Factory.StartNew(
() => textBox1.Text = r.Next(0, 1000).ToString(),
CancellationToken.None,
TaskCreationOptions.None,
uiScheduler);
Thread.Sleep(1000);
}
}
I would like to know how to create a label that adds sum + 1 every 5 seconds? I've tried with an if loop but unfortunately it resets one second later.
Thank you in advantage for your attention
using System.Diagnostics;
// using system.diagnotics voor stopwatch
namespace WindowsFormsApplication7
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private Stopwatch sw = new Stopwatch();
private void button1_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
sw.Start();
if (timer1.Enabled == true) { button1.Text = "stop"; }
else { button1.Text = "false"; sw.Stop(); }
}
private void timer1_Tick(object sender, EventArgs e)
{
int hours = sw.Elapsed.Hours;
int minutes = sw.Elapsed.Minutes;
int seconds = sw.Elapsed.Seconds;
int sum = 0;
label1.Text = hours + ":" ;
if (minutes < 10) { label1.Text += "0" + minutes + ":"; }
else { label1.Text += minutes + ":"; }
if (seconds < 10) { label1.Text += "0" + seconds ; }
else { label1.Text += seconds ; }
if (seconds ==5) { sum = sum +=1; }
label2.Text = Convert.ToString(sum);
}
}
}
sum should be a class field. Also you can use custom format string for elapsed TimeSpan.
int sum = 0;
private void timer1_Tick(object sender, EventArgs e)
{
// int sum = 0; local variable will be set to zero on each timer tick
label1.Text = sw.Elapsed.ToString(#"hh\:mm\:ss");
// btw this will not update sum each five seconds
if (sw.Elapsed.Seconds == 5)
sum++; // same as sum = sum +=1;
label2.Text = sum.ToString();
}
Your current implementation will increase sum only if current elapsed timeout's second value is five. Which could never happen (depending on your timer interval). If you have timer interval set to 1000 milliseconds, then you can increase sum on each tick, but set label2.Text = (sum % 5).ToString().
every time your stopwatch TICKS, sum is inside TICK and it will reset and start from
int sum=0;
so try to make sum variable GLOBAL outside timer1_Tick event and it will continue increasing.
You will have to move sum out of the timer callback as you are setting it to 0 each time the timer elapses
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private int sum = 0;
private DateTime lastUpdate;
private Stopwatch sw = new Stopwatch();
private void timer1_Tick(object sender, EventArgs e)
{
label1.Text = string.Format("{0:00}:{1:00}:{2:00}",
sw.Elapsed.Hours, sw.Elapsed.Minutes, sw.Elapsed.Seconds);
if (DateTime.Now >= lastUpdate.AddSeconds(5))
{
sum++;
lastUpdate = DateTime.Now;
label2.Text = sum.ToString();
}
}
private void button1_Click(object sender, EventArgs e)
{
if (timer1.Enabled == true)
{
sw.Stop();
button1.Text = "stop";
}
else
{
sum = 0;
lastUpdate = DateTime.Now;
timer1.Enabled = true;
sw.Start();
button1.Text = "Start";
}
}
Hey guys im trying to get a simple button masher up, What i want timer1 to do is mash keys in richtextbox1 for 30 seconds over and over, after 30 seconds Activate timer2, which will disable timer 1 and press keys in richtextbox 2 once, then wait 10 seconds and activate timer 1 again.
Im extremley new to c# but ive tried using timer 3 to stop timer 2 and start timer 1 again and it just messes it self up. The code ive tried is below. Any help apreciated...
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void timer1_Tick(object sender, EventArgs e)
{
SendKeys.Send(richTextBox1.Text);
SendKeys.Send("{ENTER}");
}
private void button1_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
timer2.Enabled = true;
}
private void timer2_Tick(object sender, EventArgs e)
{
SendKeys.Send(richTextBox2.Text);
SendKeys.Send("{ENTER}");
timer1.Enabled = false;
}
private void timer3_Tick(object sender, EventArgs e)
{
timer1.Enabled = true;
timer2.Enabled = false;
}
private void richTextBox2_TextChanged(object sender, EventArgs e)
{
}
private void richTextBox1_TextChanged(object sender, EventArgs e)
{
}
}
}
I suggest to use just one timer, increment a state counter every second, and perform an action base on the current state.
public Form1()
{
this.InitializeComponent();
// Just to illustrate - can be done in the designer.
this.timer.Interval = 1000; // One second.
this.timer.Enable = true;
}
private Int32 state = 0;
private void timer_Tick(Object sender, EventArgs e)
{
if ((0 <= this.state) && (this.state < 30)) // Hit text box 1 30 times.
{
SendKeys.Send(this.richTextBox1.Text);
SendKeys.Send("{ENTER}");
}
else if (this.state == 30) // Hit text box 2 once.
{
SendKeys.Send(this.richTextBox2.Text);
SendKeys.Send("{ENTER}");
}
else if ((31 <= this.state) && (this.state < 40)) // Do nothing 9 times.
{
// Do nothing.
}
else
{
throw new InvalidOperationException(); // Unexpected state.
}
// Update state.
this.state = (this.state + 1) % 40;
}
The variant with two numeric up down controls.
public Form1()
{
this.InitializeComponent();
// Just to illustrate - can be done in the designer.
this.timer.Interval = 1000; // One second.
this.timer.Enable = true;
}
private Int32 state = 0;
private void timer_Tick(Object sender, EventArgs e)
{
Decimal n1 = this.numericUpDown1.Value;
Decimal n2 = this.numericUpDown2.Value;
if ((0 <= this.state) && (this.state < n1))
{
SendKeys.Send(this.richTextBox1.Text);
SendKeys.Send("{ENTER}");
}
else if (this.state == n1)
{
SendKeys.Send(this.richTextBox2.Text);
SendKeys.Send("{ENTER}");
}
else if ((n1 <= this.state) && (this.state < n1 + n2))
{
// Do nothing.
}
else
{
// Reset state to resolve race conditions.
this.state = 0;
}
// Update state.
this.state = (this.state + 1) % (n1 + n2);
}
If timer3 is running continuously, won't it start timer1 and stop timer2 at unpredictable times, without warning?
IOW, what starts and stops timer3?
As JustLoren pointed out, there might be a cleaner way to do this. Perhaps a single timer event and some controlling logic and flags, rather than trying to juggle three timers.