call Tick event when timer starts [duplicate]

问题

I'm using 'System.Windows.Forms.Timer' to repeat a task. But when the timer starts, I have to wait for one interval before the task starts. The interval is set to 10 seconds to give the task enough time to do it's thing. But there is an 'awkward silence' waiting for it to start the first time. Is there a way to trigger the Tick event when the timer is enabled? (I am unable to use threading, callbacks or events to get the task repeat)

    private int counter;
    Timer t = new Timer();

    private void InitializeTimer()
    {
        counter = 0;
        t.Interval = 750;
        t.Enabled = true;

        t.Tick += new EventHandler(timer1_Tick);
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        if (counter >= 3)
        {
            t.Enabled = false;                
        }
        else
        {
            //do something here
            counter++;
        }
    }

回答1:

You can always call your method manually:

private void InitializeTimer()
{
    counter = 0;
    t.Interval = 750;
    t.Enabled = true;
    timer1_Tick(null, null);

    t.Tick += new EventHandler(timer1_Tick);
}

回答2:

You could use a System.Threading.Timer.

This has a constructor that takes an initial wait period. Set this to zero and the timer will trigger the callback immediately then every interval you specify thereafter.

Timer stateTimer = new Timer(tcb, autoEvent, 0, 750);

回答3:

Just create a method then call this from within your timer and also just before you start your timer.

private int counter; 
Timer t = new Timer(); 

private void InitializeTimer() 
{ 
    counter = 0; 
    t.Interval = 750; 

    DoMything();
    t.Tick += new EventHandler(timer1_Tick); 
    t.Enabled = true; 
} 

private void timer1_Tick(object sender, EventArgs e) 
{ 
    if (counter >= 3) 
    { 
        t.Enabled = false;                 
    } 
    else 
    { 
        //do something here 
        counter++; 
        DoMything();
    } 
} 


private void DoMything()
{
   //Do you stuff here
}

回答4:

The simplest way might be to initially set the Interval to something very small, then increase it in the Tick handler, or in a separate handler.

This will ensure the first "tick" occurs in the same manner as subsequent ticks, e.g. on its own thread, rather than in the context of the initialize method.

来源：https://stackoverflow.com/questions/12073703/call-tick-event-when-timer-starts

标签

timer