Schedule Cron Jobs using HostedService in ASP.NET Core | HOW TO - Code Samples

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In this video, we will go over the use case of scheduling cron jobs using a customized HostedService in an ASP.NET Core Web API project. The output will show the runtime logging for the final application, which has three background tasks running at every 5 minutes, every 1 minute, and every day at 12:50 PM.

The job schedules are defined by Cron Expressions. For example, the cron expression */5 * * * * represents a schedule of every 5 minutes, the cron expression * * * * * defines a minute-by-minute schedule, and the cron expression 50 12 * * * means 12:50 PM daily.

In order to parse the cron expressions, we add a NuGet package Cronos to the Web API project. The Cronos package is a lightweight but full-fledged library for parsing cron expressions and calculating next occurrences with time zones and daylight saving time in mind. The Cronos is an open source project sponsored by HangfireIO.

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