Timer returning unwanted formatting [duplicate]

问题

I created a timer that returns the decreasing time:

public static void timerIdle_Tick(object sender, EventArgs e)
{        

    if (tempo >= 60)
    {
        minuto = tempo / 60;
        segundo = tempo % 60;
    }
    else
    {
        minuto = 0;
        segundo = tempo;
    }

    segundo--;
    if (minuto > 0)
    {
        if (segundo < 0)
        {
            segundo = 59;
            minuto--;
        }
    }

    if (minuto == 0 && segundo == 0)
    {
        timerIdle.Stop();
        timerIdle.Dispose();
        dgView.addLinha(2, "config_Teste", "TIMER ACABOU", 0);

    }
    else
    {
        tempo = (minuto * 60) + segundo;

        string temp = minuto + ":" + segundo;
        lblIdle.Text = temp;
        dgView.addLinha(2, "config_Teste", temp, 0);
    }
}

I get the following result:

...
1:12
1:11
1:10
1:9
1:8
...
0:0

I need to add 0 (Zero) if the minute and second has only one digit:

01:12
01:11
01:10
01:09
01:08
...
00:00

The PadLeft() function does not work because I am using C # 7.3 (.NET Framework 4.7.2).

Please, help-me.

回答1:

So this will format your minutes and seconds into two digits

int minuto = 1;
int segundo= 1;
string temp = string.Format($"{minuto:D2}:{segundo:D2}");

Output:

01:01

回答2:

You just need to set the countdown duration in seconds when you start the Timer, subtract 1 every second in the Tick event until you get 0 then stop the timer. Use the TimeSpan.FromSeconds method to format the time string.

//Class variable...
int segundo = 0;

void WhereYouStartTheTimer()
{
    segundo = 60; //1 Minute
    timerIdle.Interval = 1000; //Fires every 1 second.
    timerIdle.Start();
}

private void timerIdle_Tick(object sender, EventArgs e)
{
    segundo--;

    if (segundo == 0)
    {
        timerIdle.Stop();
        dgView.addLinha(2, "config_Teste", "TIMER ACABOU", 0);
    }
    else
        dgView.addLinha(2, "config_Teste", TimeSpan.FromSeconds(segundo).ToString(@"mm\:ss"), 0);
}

Side note, you don't need to timerIdle.Dispose(); if you create it by the designer. If you create it and subscribe to the Tick event by code, then you have to remove the handler too then dispose it:

//...
timerIdle.Stop();
timerIdle.Tick -= timerIdle_Tick;
timerIdle.Dispose();
//...

You might want to read Standard TimeSpan format strings for more.

来源：https://stackoverflow.com/questions/62927335/timer-returning-unwanted-formatting

标签

timer

countdowntimer