How to run a timer in C# only once?

Question

I want a timer in C# to destroy itself once it has executed. How might I achieve this?

private void button1_Click(object sender, EventArgs e)
{
    ExecuteIn(2000, () =>
    {
        MessageBox.Show("fsdfs");   
    });           
}

public static void ExecuteIn(int milliseconds, Action action)
{
    var timer = new System.Windows.Forms.Timer();
    timer.Tick += (s, e) => { action(); };
    timer.Interval = milliseconds;
    timer.Start();

    //timer.Stop();
}

I want this message box to show only once.

jorx · Accepted Answer · 2015-11-07 09:41:04Z

34

use the Timer.AutoReset property:
https://msdn.microsoft.com/en-us/library/system.timers.timer.autoreset(v=vs.110).aspx

i.e:

System.Timers.Timer runonce=new System.Timers.Timer(milliseconds);
runonce.Elapsed+=(s, e) => { action(); };
runonce.AutoReset=false;
runonce.Start();

To stop or dispose the Timer in the Tick method is unstable as far as I am concerned

EDIT: This doesn't work with System.Windows.Forms.Timer

edited Nov 7, 2015 at 9:41

answered Nov 7, 2015 at 9:32

jorx

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1 Comment

Developer Marius Žilėnas Over a year ago

For a difference between timers stackoverflow.com/a/4532859/1737819

Matthew DesEnfants · Accepted Answer · 2017-06-29 16:55:38Z

17

My favorite technique is to do this...

Task.Delay(TimeSpan.FromMilliseconds(2000))
    .ContinueWith(task => MessageBox.Show("fsdfs"));

edited Jun 29, 2017 at 16:55

answered Jul 27, 2016 at 3:37

Matthew DesEnfants

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2 Comments

Don Rolling Over a year ago

this is better than a timer by far.

OneWorld Over a year ago

Use System.Threading.Tasks.TaskEx instead of Task if you target .NET 4.0 stackoverflow.com/questions/35041478/await-async-taskex/…

Jens Kloster · Accepted Answer · 2013-05-30 05:06:03Z

7

Try stopping the timer as soon as it enters Tick:

timer.Tick += (s, e) => 
{ 
  ((System.Windows.Forms.Timer)s).Stop(); //s is the Timer
  action(); 
};

answered May 30, 2013 at 5:06

Jens Kloster

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1 Comment

Jared Beach Over a year ago

AutoReset is a better solution

mehdi.loa · Accepted Answer · 2013-05-30 05:05:50Z

0

add

timer.Tick += (s, e) => { timer.Stop() };

after

timer.Tick += (s, e) => { action(); };

answered May 30, 2013 at 5:05

mehdi.loa

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Comments

Griknok · Accepted Answer · 2013-05-30 05:28:18Z

0

Put timer.Dispose() it in the method for Tick before the action (if the action waits on a user's respose i.e. your MessageBox, then the timer will continue until they've responded).

timer.Tick += (s, e) => { timer.Dispose(); action(); };

answered May 30, 2013 at 5:28

Griknok

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Comments

Ritesh Khatri · Accepted Answer · 2013-05-30 06:22:41Z

0

In Intializelayout() write this.

this.timer1 = new System.Windows.Forms.Timer(this.components);
this.timer1.Enabled = true;
this.timer1.Tick += new System.EventHandler(this.timer1_Tick);

and in form code add this method

private void timer1_Tick(object sender, EventArgs e)
    {
        doaction();
        timer1.Stop();
        timer1.Enabled = false;
    }

answered May 30, 2013 at 6:22

Ritesh Khatri

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