在 C# 中使用秒表定期检查 5 秒

Question

我想在 C# 中定期检查 60 秒。我能够通过如下定期检查日期来做到这一点

但是，当我使用秒表时，秒表会重置回开头，而不是从上次秒表停止时继续。

using System;
using System.Diagnostics;
using System.Threading;

namespace StopwatchExample
{
    class Program
    {
        static void Main()
        {
            ////Works
            //DateTime start = DateTime.Now;
            //while (true)
            //{
            //    DateTime current = DateTime.Now;
            //    var diffInSeconds = (current - start).TotalSeconds;
            //    if (diffInSeconds > 5)
            //    {
            //        Console.WriteLine("5 s done!");
            //        break;
            //    }
            //}

            // Does not work
            Stopwatch stopwatch = new Stopwatch();
            stopwatch.Start();
            while (true)
            {
                stopwatch.Stop();
                if (stopwatch.Elapsed.Seconds > 5)
                {
                    Console.WriteLine("5 s done!");
                    break;
                }
                else
                {
                    stopwatch.Start();
                }
            }

            Console.ReadLine();
        }
    }
}

Answer 1

尝试使用计时器 (System.Timers) 而不是秒表。设置所需的时间间隔并对 Elapsed 事件执行必要的操作。

Here你可以了解更多。

示例：

public static void Main()
{
    // Create a timer and set a two second interval.
    aTimer = new System.Timers.Timer();
    aTimer.Interval = 2000; // 2000ms == 2s

    // Hook up the Elapsed event for the timer. 
    aTimer.Elapsed += OnTimedEvent;

    // Have the timer fire repeated events (true is the default)
    aTimer.AutoReset = true;

    // Start the timer
    aTimer.Enabled = true;

    Console.WriteLine("Press the Enter key to exit the program.");
    Console.ReadLine();
}

private static void OnTimedEvent(Object source, System.Timers.ElapsedEventArgs e)
{
    Console.WriteLine("The interval has been elapsed");
}

Answer 2

正如其他人所说，Timer 可能是更好的解决方案。鉴于您对 Stopwatch 的使用，您需要将逻辑更改为：

        Stopwatch stopwatch = new Stopwatch();
        stopwatch.Start();
        while (true)
        {
            // Check elapsed time w/o stopping/resetting the stopwatch
            // May want to include the 5 seconds themselves (>= instead of >)
            if (stopwatch.Elapsed.Seconds >= 5)
            {
                // At least 5 seconds elapsed, restart stopwatch.
                stopwatch.Stop();
                stopwatch.Start();
                Console.WriteLine("5 s done!");
                // Not sure about this, if you really want to check "periodically",
                // this break makes less sense, because the checking
                // logic will stop after the first 5 seconds have elapsed.
                break;
            }
        }

在 C# 中使用秒表定期检查 5 秒

Periodically checking for 5 seconds using Stopwatch in C#

c#

stopwatch