将总和添加到计时器

Question

我想知道如何创建一个sum + 1每 5 秒添加一次的标签？我尝试过使用 if 循环，但不幸的是它在一秒钟后重置。

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);
        }
    }
}

Answer 1

sum应该是一个类字段。您还可以使用自定义格式字符串来表示经过的时间跨度。

    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();
    }

仅当当前已用超时的第二个值为 5 时，当前的实现才会增加总和。这永远不会发生（取决于你的计时器间隔）。如果您将计时器间隔设置为 1000 毫秒，那么您可以增加每个刻度的总和，但设置label2.Text = (sum % 5).ToString()。