TimeCrontab

Install-Package TimeCrontab

dotnet add package TimeCrontab

var crontab = Crontab.Parse("* * * * *");
var nextOccurrence = crontab.GetNextOccurrence(DateTime.Now);

var crontab = Crontab.Parse("* * * * * *", CronStringFormat.WithYears);
var nextOccurrence = crontab.GetNextOccurrence(DateTime.Now);

var crontab = Crontab.Parse("* * * * * *", CronStringFormat.WithSeconds);
var nextOccurrence = crontab.GetNextOccurrence(DateTime.Now);

var crontab = Crontab.Parse("* * * * * * *", CronStringFormat.WithSecondsAndYears);
var nextOccurrence = crontab.GetNextOccurrence(DateTime.Now);

// 阻塞方式
var crontab = Crontab.Parse("* * * * * *", CronStringFormat.WithSeconds);
while(true)
{
    Thread.Sleep(crontab.GetSleepMilliseconds(DateTime.UtcNow));
    Console.WriteLine(DateTime.Now.ToString("G"));
}

// 无阻塞方式
var crontab = Crontab.Parse("* * * * * *", CronStringFormat.WithSeconds);
Task.Factory.StartNew(async () =>
{
    while (true)
    {
        await Task.Delay(crontab.GetSleepMilliseconds(DateTime.UtcNow));
        Console.WriteLine(DateTime.Now.ToString("G"));
    }
}, TaskCreationOptions.LongRunning);

using TimeCrontab;

namespace WorkerService;

public class Worker : BackgroundService
{
    private readonly ILogger<Worker> _logger;

    private readonly Crontab _crontab;

    public Worker(ILogger<Worker> logger)
    {
        _logger = logger;
        _crontab = Crontab.Parse("* * * * * *", CronStringFormat.WithSeconds);
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            var taskFactory = new TaskFactory(System.Threading.Tasks.TaskScheduler.Current);

            await taskFactory.StartNew(async () =>
            {
                // 你的业务代码写到这里面

                _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);

                await Task.CompletedTask;
            }, stoppingToken);

            await Task.Delay(_crontab.GetSleepMilliseconds(DateTime.UtcNow), stoppingToken);
        }
    }
}

// macro 字符串
var secondly = Crontab.Parse("@secondly");    // 每秒
var minutely = Crontab.Parse("@minutely");    // 每分钟
var hourly = Crontab.Parse("@hourly");    // 每小时
var daily = Crontab.Parse("@daily");  // 每天 00:00:00
var monthly = Crontab.Parse("@monthly");  // 每月 1 号 00:00:00
var weekly = Crontab.Parse("@weekly");    // 每周日 00：00：00
var yearly = Crontab.Parse("@yearly");    // 每年 1 月 1 号 00:00:00

// 静态属性
var secondly = Crontab.Secondly;    // 每秒
var minutely = Crontab.Minutely;    // 每分钟
var hourly = Crontab.Hourly;    // 每小时
var daily = Crontab.Daily;  // 每天 00:00:00
var monthly = Crontab.Monthly;  // 每月 1 号 00:00:00
var weekly = Crontab.Weekly;    // 每周日 00：00：00
var yearly = Crontab.Yearly;    // 每年 1 月 1 号 00:00:00

public class TimeCrontabUnitTests
{
    [Theory]
    [InlineData("* * * * *", "* * * * *", CronStringFormat.Default)]
    [InlineData("0 0 31W * *", "0 0 31W * *", CronStringFormat.Default)]
    [InlineData("0 23 ? * MON-FRI", "0 23 ? * 1-5", CronStringFormat.Default)]
    [InlineData("*/5 * * * *", "*/5 * * * *", CronStringFormat.Default)]
    [InlineData("30 11 * * 1-5", "30 11 * * 1-5", CronStringFormat.Default)]
    [InlineData("23 12 * JAN *", "23 12 * 1 *", CronStringFormat.Default)]
    [InlineData("* * * * MON#3", "* * * * 1#3", CronStringFormat.Default)]
    [InlineData("*/5 * L JAN *", "*/5 * L 1 *", CronStringFormat.Default)]
    [InlineData("0 0 ? 1 MON#1", "0 0 ? 1 1#1", CronStringFormat.Default)]
    [InlineData("0 0 LW * *", "0 0 LW * *", CronStringFormat.Default)]
    [InlineData("0 30 10-13 ? * WED,FRI", "0 30 10-13 ? * 3,5", CronStringFormat.WithSeconds)]
    [InlineData("0 */5 * * * *", "0 */5 * * * *", CronStringFormat.WithSeconds)]
    [InlineData("0 0/1 * * * ?", "0 */1 * * * ?", CronStringFormat.WithSeconds)]
    [InlineData("5-10 30-35 10-12 * * *", "5-10 30-35 10-12 * * *", CronStringFormat.WithSeconds)]
    public void TestParse(string expression, string outputString, CronStringFormat format)
    {
        var output = Crontab.Parse(expression, format).ToString();
        Assert.Equal(outputString, output);
    }

    [Theory]
    [InlineData("* * * * *", "2021-01-01 00:01:00", CronStringFormat.Default)]
    [InlineData("0 0 31W * *", "2021-01-29 00:00:00", CronStringFormat.Default)]
    [InlineData("0 23 ? * MON-FRI", "2021-01-01 23:00:00", CronStringFormat.Default)]
    [InlineData("*/5 * * * *", "2021-01-01 00:05:00", CronStringFormat.Default)]
    [InlineData("30 11 * * 1-5", "2021-01-01 11:30:00", CronStringFormat.Default)]
    [InlineData("23 12 * JAN *", "2021-01-01 12:23:00", CronStringFormat.Default)]
    [InlineData("* * * * MON#3", "2021-01-18 00:00:00", CronStringFormat.Default)]
    [InlineData("*/5 * L JAN *", "2021-01-31 00:00:00", CronStringFormat.Default)]
    [InlineData("0 0 ? 1 MON#1", "2021-01-04 00:00:00", CronStringFormat.Default)]
    [InlineData("0 0 LW * *", "2021-01-29 00:00:00", CronStringFormat.Default)]
    [InlineData("0 30 10-13 ? * WED,FRI", "2021-01-01 10:30:00", CronStringFormat.WithSeconds)]
    [InlineData("0 */5 * * * *", "2021-01-01 00:05:00", CronStringFormat.WithSeconds)]
    [InlineData("0 0/1 * * * ?", "2021-01-01 00:01:00", CronStringFormat.WithSeconds)]
    [InlineData("5-10 30-35 10-12 * * *", "2021-01-01 10:30:05", CronStringFormat.WithSeconds)]
    public void TestGetNextOccurence(string expression, string nextOccurenceString, CronStringFormat format)
    {
        var beginTime = new DateTime(2021, 1, 1, 0, 0, 0);
        var crontab = Crontab.Parse(expression, format);
        var nextOccurence = crontab.GetNextOccurrence(beginTime);
        Assert.Equal(nextOccurenceString, nextOccurence.ToString("yyyy-MM-dd HH🇲🇲ss"));
    }
}

MIT License

Copyright (c) 2020-2022 百小僧, Baiqian Co.,Ltd.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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copies or substantial portions of the Software.

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SOFTWARE.