我如何订购asp.net core每天运行一次方法？

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我的asp核心程序需要收集前一天访问网站的所有IP。

My asp core program needs to collect all the IP which access the website pre-day.

我需要在以下情况下将IP列表输出到txt文件：一天结束了。

I need to output the IP list to a txt file when a day is over.

因此，程序应该运行一种每天保存一次IP列表的方法。

Therefore, the program should run a method to save the IP list once per-day.

我应该如何设计？

我认为，我将在 startup.cs 并将 Task.Delay 设置为24小时（一天）。

In my opinion, I will add a looping task in the startup.cs and set the Task.Delay to 24 hours(one day).

我应该这样做吗？谢谢。

Should I do it like this? Thank you.

推荐答案

这就是我在ASP.Net Core中实现调度程序任务的方式。请注意，您必须知道如何使用cron epxression。

This is how I implement scheduler task in ASP.Net Core. Please note that you have to know how to use cron epxression.

首先将此程序包添加到csproj中

First add this package in your csproj

<PackageReference Include="ncrontab" Version="3.3.1" />

接下来，我将创建SceduledProcessor.cs

Next I will create SceduledProcessor.cs

public abstract class ScheduledProcessor : ScopedProcessor { private readonly CrontabSchedule _schedule; private DateTime _nextRun; protected ScheduledProcessor(IServiceScopeFactory serviceScopeFactory) : base(serviceScopeFactory) { _schedule = CrontabSchedule.Parse(GetCronExpression(serviceScopeFactory)); _nextRun = _schedule.GetNextOccurrence(DateTime.Now); } protected override async Task ExecuteAsync(CancellationToken stoppingToken) { do { var now = DateTime.Now; _schedule.GetNextOccurrence(now); if (now > _nextRun) { await ProcessBackgroundTask(); _nextRun = _schedule.GetNextOccurrence(DateTime.Now); } await Task.Delay(5000, stoppingToken); } while (!stoppingToken.IsCancellationRequested); } protected abstract string GetCronExpression(IServiceScopeFactory serviceScopeFactory); }

将针对我们的方案运行ExecuteAsync

The ExecuteAsync will be run for our scenario

请注意，我们必须实现GetCronExpression方法

Please note that we have to implement GetCronExpression method

接下来，我将实现服务类

Next I will implement the service class

public class ScheduledEmailService : ScheduledProcessor { public ScheduledEmailService( IServiceScopeFactory serviceScopeFactory) : base(serviceScopeFactory) { } /// <summary> /// Get cron setting from db /// </summary> /// <returns></returns> protected override string GetCronExpression(IServiceScopeFactory serviceScopeFactory) { return ""; // return your cron expression here you can get from db or static string } public override Task ProcessInScope(IServiceProvider serviceProvider) { // do something you wish return Task.CompletedTask; } }

这里的奖金我是小类，具有cron表达式的预定义值您可以使用它

Bonus here I small class with predefined value for cron expression you can use it

public static class CronExpression { public static readonly string EveryMinute = "0 * * * * *"; public static readonly string EveryDay = "0 0 0 * * *"; public static readonly string EveryWeek = "0 0 * * 0"; public static readonly string EveryWeekend = "0 0 0 * * 6,0"; }

最后将其添加到Startup.cs

Finally add this to your Startup.cs

services.AddSingleton<IHostedService, ScheduledEmailService>();