I have a fairly long-running process (several minutes) that I need to run roughly once a month - but not on a fixed schedule, but after a user clicks Go in a ASP.NET Webforms GUI page.
Since ASP.NET really isn't designed to handle long-running background tasks, my idea was to put this into a separate console app. But how to launch that as needed?
What happens if I use Process.Start(....) from my ASP.NET page's code-behind? I would like to avoid blocking the whole Web UI for 20 minutes or so... and also: even if it doesn't block my UI, what happens to my long-running task if the ASP.NET app pool recycles while it's still running?
Another idea was to have a frequently running job (runs every 2 minutes) check for some kind of a flag (e.g. existence of some database entries), and if needed, that job would then launch the long-running task.
But the same question: if I launch my 20-minute task from a job using Process.Start() - does that block the caller?
It seems like a bit of overkill to schedule that long running tasks five times a day since it typically is run only once a month - but at the same time, the user expects to have his results within a reasonable amount of time (less than 1 hour, if ever possible) after scheduling the process - so I cannot really just schedule it to run once at night either ...
First off - for several reasons - ASP.NET is imho not the solution for long-running tasks/jobs/... whatsoever.
I have had this requirement a lot of times, and always solved/separated it like:
Worker
A service with
- Quartz.net (for scheduling and processing, even if you don't have a specific timestamp for execution - but the overall handling in this framework is simply superb)
- a persistent job-store (to handle start/stop and completed/aborted/paused jobs)
- eg ServiceStack as the interop between the two processes
Website
Simply calls some webservice-methods of the worker to enqueue/query/pause/stop/... a job. For querying jobs a call to a unified job-store might be an option (eg. db)
It might be a bit of an overkill for you though ... but this is my Swiss army knife for such scenarios.
Hangfire is what you are looking for. Best part is it comes with a built in dashboard.
You might have to write some logic on the top of it.
You can find it here. http://hangfire.io/
Use the standard built-in Windows Task Scheduler like you have done, but invoke it from your web application.
Configure your task in Task Scheduler. It does not need to have a scheduled trigger. From your web application, just use Process.Start to kick it off:
SchTasks.exe /Run /TN Folder\Taskname
I have not used SchTasks.exe directly, but have used the Microsoft.Win32.TaskScheduler wrapper classes.
来源：https://stackoverflow.com/questions/28109449/launching-a-long-running-background-task-from-asp-net-or-a-scheduled-job