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IScheduler scheduler = StdSchedulerFactory.GetDefaultScheduler() Namespace ScheduledTaskExample.ScheduledTasks Quartz has an IJob interface with just one method, Execute, to implement. NET port of the popular Java job scheduling framework of the (almost) same name. }).ToRunNow().AndEvery(1).Months().OnTheFirst(DayOfWeek.Monday).At(3, 0) įluentScheduler also embraces IoC and can easily plug into your favorite Dependency Injection tool of choice by just implementing their ITaskFactory interface. Schedule a more complex action to run immediately and on an monthly intervalĬonsole.WriteLine("Complex Action Task Starts: " + DateTime.Now) Ĭonsole.WriteLine("Complex Action Task Ends: " + DateTime.Now) Schedule(() => Console.WriteLine("Timed Task - Will run every day at 9:15pm: " + DateTime.Now)).ToRunEvery(1).Days().At(21, 15) Schedule a simple task to run at a specific time Schedule().ToRunNow().AndEvery(2).Seconds() Schedule an ITask to run at an interval You have really explicit control over when your tasks run. Return RedirectToAction("Index", "Home") įluentScheduler is a more sophisticated and complex scheduler that features a (you guessed it) fluent interface. HostingEnvironment.QueueBackgroundWorkItem(ct => SendMailAsync(user.Email)) Here's an example that kicks of a background work item from an MVC action: public ActionResult SendEmail( User user) The API is pretty straightforward, taking Func. If you can't finish in 90 seconds, then you'll need a different (and more robust, meaning, out of process) technique. It can try to delay an AppDomain for as long as 90 seconds in order to allow your task to complete. This differs from a normal ThreadPool work item in that ASP.NET automatically keeps track of how many work items registered through this API are currently running, and the ASP.NET runtime will try to delay AppDomain shutdown until these work items have finished executing. QBWI schedules a task which can run in the background, independent of any request. It's not just a "Task.Run," it tries to be more: NET 4.5.2 added QueueBackgroundWorkItem as a new API. Somewhat in response to the need for WebBackgrounder. } Built in: QueueBackgroundWorkItem - Added in. Return new Task(() => Thread.Sleep(3000))
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Public SampleJob(TimeSpan interval, TimeSpan timeout) If your ASP.NET application just needs one background task to runs an a basic scheduled interval, than perhaps you just need the basics of WebBackgrounder. The goal of this project is to handle one task only, manage a recurring task on an interval in the background for a web app.
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WebBackgrounderĪs it says " WebBackgrounder is a proof-of-concept of a web-farm friendly background task manager meant to just work with a vanilla ASP.NET web application." Its code hasn't been touched in years, BUT the WebBackgrounder NuGet package has been downloaded almost a half-million times.
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There's lots of great articles and videos on how to use Azure WebJobs, and lots of documentation on how Worker Roles in scalable Azure Cloud Services work, but not a lot about how your hosted ASP.NET application and easily have a background service. scale the background processing workload independently of your Website and you need control over the machine.Advanced: Azure Worker Role in a Cloud Service.A formal Azure feature used for offloading running of background tasks outside of your Website and scale the workload.used for writing background tasks in your ASP.NET website.General: Hangfire (or similar similar open source libraries).The spectrum of usage is roughly this, in my opinion: Some ASP.NET apps will be hosted in IIS in your data center and others will be hosted in the Azure cloud. There's LOT of great ways for you to do things in the background and a lot of libraries and choices available. I'm not impugning your skills, I'm just saying it's subtle. If you think you can just write a background task yourself, it's likely you'll get it wrong.
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The AppDomain your site runs in can go down for a number of reasons and take down your background task with it.If you run your site in a Web Farm, you could end up with multiple instances of your app that all attempt to run the same task at the same time.An unhandled exception in a thread not associated with a request will take down the process.Read it, but here's a summary from his post. In it he points out a few gotchas that are SO common when folks try to do work in the background. A few years back Phil Haack wrote a great article on the dangers of recurring background tasks in ASP.NET.