![]() ![]() I have put a sample application here which contains the codes in this article and the rest of the ASP.NET Core app. Note: The console is not real-time if you use SQLite as the storage engine. Hangfire has a lot of extensions, you can check them out here. You can construct Cron expressions through sites like this and this. And you define the schedule using a Cron Expression. The job can be a simple expression or a class. If you want a job to be executed periodically on a defined schedule, you can write something like this: (job => job.Execute(10), cronExpression: "*/5 * * * *") dependency the job might need via Dependency Injectionįor (int i = 0 i (job => job.Execute(5)) ![]() You can ask for configuration or any other Public SendEmailsJob(IConfiguration configuration) For example you need a connection to the database or access to configurations? Well, then you can create a class for the job and get your dependencies through Dependency Injection: public class SendEmailsJob What if you wanted to something that might require some dependencies. you don't want to wait for the result and you don't care much about when exactly it's going to happen), you do something like this: backgroundJobs.Enqueue(() => Console.WriteLine("Hello world from Hangfire!")) If you want to enqueue a job in a fire-and-forget fashion (i.e. Now you can run the app and go to /hangfire and see it. Add the processing server as IHostedServiceĭefine Hangfire Dashboard route: app.UseEndpoints(endpoints => SetDataCompatibilityLevel(CompatibilityLevel.Version_170) Services.AddHangfire(configuration => configuration The official guide is very good but here are the steps:Īdd Hangfire to Dependency Container: // Add Hangfire services. You can also use MSSQL, PostgreSQL, MySQL and other database engines and host it in a console app. We are going to host hangfire in an ASP.NET Core app and use SQLite for storage. And it supports different styles and techniques of background job processing. It's also customizable and supports different kinds of storage mechanisms. Hangfire is a library that helps you do all of that and more very easily. And what about retrying jobs when they fail? With CronTrigger, you can specify firing-schedules such as 'every Friday at noon', or 'every weekday and 9:30 am', or even 'every 5. And Maybe you want to have multiple workers (consumers) processing the background jobs and the works might be on different machines. CronTriggers are often more useful than SimpleTrigger, if you need a job-firing schedule that recurs based on calendar-like notions, rather than on the exactly specified intervals of SimpleTrigger. So you need to persist the jobs so that they are not lost. But then if the application restarts all of the scheduled jobs would be gone. You can of course use an in-memory model and use ASP.NET Core's IHostedService. In short, you want to be able to schedule jobs and be able to track their progress and see their results. For example generating a resource-intensive report at midnight or sending monthly invoices to customers. Or maybe you want to do some task periodically. in the background) and returning a response before the jobs are done. So you have to send the emails asynchronously (i.e. Sometimes you've tasks that would take too much time to do in the request-response model. Note: This post is part of C# Advent Calendar 2020. ![]()
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