Quartz in ASP.net Core project: how to get the scheduler instance

Master_T 0
Viewed 35

I have an ASP.net Core 6 project where I added Quartz to my services, like described here:

https://www.quartz-scheduler.net/documentation/quartz-3.x/packages/aspnet-core-integration.html#installation

This works and allows you to configure jobs and triggers during app startup.

However, what if I want to modify/add/remove a job or trigger while the app is running? I would need to retrieve the underlying IScheduler instance (ideally through the DI mechanism), but I don't know the proper way to do it in an ASP.net Core app.

So, how can you access the scheduler instance from DI in a .net core project?

quartz.net asp.net-core-6.0 asp.net-core c#
1 Answers

After looking at the Quartz source code, I've understood how to do this.

Indeed, you cannot inject IScheduler, in fact it wouldn't make much sense because you can have multiple schedulers configured, so the DI container would have no way to decide which one to inject.

Instead, you need to inject ISchedulerFactory, which you can then use to retrieve one of the configured schedulers.

Example code:

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddQuartz(q => {
    //configuring basic Quartz settings...
}

//Other configs...

var app = builder.Build();

using (var scope = app.Services.CreateScope())
{
    var schedulerFactory = scope.ServiceProvider.GetService<ISchedulerFactory>();
    var scheduler = await schedulerFactory.GetScheduler();
}
Master_T0
Related