11/25/2023 0 Comments Net core cron job![]() ![]() The ExecuteAsync method is where the code to perform the long-running task should be written. It is typically used to perform database maintenance, sending emails, or processing messages from a message queue.Ī BackgroundService is implemented by creating a class that inherits from the BackgroundService base class and overrides the ExecuteAsync method. The first question we should answer before coding is "What is a BackgroundService?".Ī BackgroundService is a long-running service running in the background of an ASP.NET Core application. With this we can easily extent the mechanism without compromising readability or testability. Especially the S aka Single responsibility principle (here a refresher: "SOLID Principles in C#". That is the cool thing with the cron notation, that we have the flexibility to do so.Īlso, another big pillar: I want to respect the SOLID principles. We can also define it monthly, or bi-weekly. Every day at midnight, for example, I like to generate a PDF report that will be sent out via E-Mail. I also want to use the DI-container that comes with ASP.NET Core itself.Ī typical usage of such a thing would be reporting. Keep this in mind! You can not schedule a job every second or every 30 seconds. The smallest resolution cron allows is on a minute base. In addition, special characters such as asterisks (*) and question marks (?) can represent all possible values or indicate a specific field that should be ignored.įor example, the cron expression "0 0 1 * *" would execute a command at midnight on the first day of every month, while "0 0 * * 0" would execute a command at midnight every Sunday. +- minute (0 - 59)Įach field can be a specific value or a range of values, and commas can separate multiple values. The fields are separated by whitespace and represent the following values: * * * * * I want to create a background worker in ASP.NET Core that run recurringly via the cron notation.Ĭron notation, also known as a cron expression, is a syntax used to define time and date-based schedules in various operating systems and applications, including Unix-based systems and web-based cron services.Ī cron expression consists of five or six fields that specify the time and date when a particular task or command should be executed. If you need a full fledge and well-tested version, please stick to Quartz or Hangfire.īefore I go into details, I want to outline what you will see in this blog post. With the help of BackgroundService we will build our own, lightweight version of it.ĭisclaimer: Obviously, the following code is meant for educational purposes to understand how to implement a very naive version of a job scheduler in C# with ASP.NET Core. You might know similar approaches under the name of Quartz or Hangfire. In this blog post we will discover how to write your own small task scheduler / job server with cron notation in ASP.NET Core. ![]()
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