Quartz.AspNetCore provides integration with ASP.NET Core hosted services.

TIP

If you only need the generic host, generic host integration might suffice.

Installation

You need to add NuGet package reference to your project which uses Quartz.

Install-Package Quartz.AspNetCore

Using

You can add Quartz configuration by invoking an extension method AddQuartzServer on IServiceCollection. This will add a hosted Quartz server into ASP.NET Core process that will be started and stopped based on applications lifetime.

TIP

See Quartz.Extensions.DependencyInjection documentation to learn more about configuring Quartz scheduler, jobs and triggers.

Example Startup.ConfigureServices configuration

public void ConfigureServices(IServiceCollection services)
{
    services.AddQuartz(q =>
    {
        // base Quartz scheduler, job and trigger configuration
    });

    // ASP.NET Core hosting
    services.AddQuartzServer(options =>
    {
        // when shutting down we want jobs to complete gracefully
        options.WaitForJobsToComplete = true;
    });
}

A practical example of the setup

In the code below you can see a real application of the Quartz package within ASP.NET Core MVC.

To better illustrate the use of the Quartz library, imagine you have a Program.cs file that is always created when you choose the MVC architecture, and then imagine a Jobs folder where you have all the tasks you want Quartz to perform in the background when you run your web application.

After that, it's pretty straightforward.

In the Jobs folder, you create a class that will perform the tasks you specify. The class should extend the IJob interface and implement the Execute method.

Example SendEmailJob.cs configuration

public class SendEmailJob : IJob
{
    public Task Execute(IJobExecutionContext context)
    {
        // Code that sends a periodic email to the user (for example)
        // Note: This method must always return a value 
        // This is especially important for trigger listers watching job execution 
        return Task.CompletedTask;
    }
}        

After that, you just need to build Quartz trigger in Program.cs, which guarantees that the job will run according to the preset interval.

Example Program.cs configuration

builder.Services.AddQuartz(q =>
{
    q.UseMicrosoftDependencyInjectionScopedJobFactory();
    // Just use the name of your job that you created in the Jobs folder.
    var jobKey = new JobKey("SendEmailJob");
    q.AddJob<SendEmailJob>(opts => opts.WithIdentity(jobKey));
    
    q.AddTrigger(opts => opts
        .ForJob(jobKey)
        .WithIdentity("SendEmailJob-trigger")
         //This Cron interval can be described as "run every minute" (when second is zero)
        .WithCronSchedule("0 * * ? * *")
    );
});
builder.Services.AddQuartzHostedService(q => q.WaitForJobsToComplete = true);

For more information on cron triggers and their format, you can use the tutorial directly from Quartz - Cron Triggers.