How to execute code in c# service one time per day

问题:

So here's my problem, I need to do a c# service running on a server who's getting file on ftp one time per day at 3am. I think that I can do it with a thread.sleep() or by compare the DateTime.Now with 3am....

Do you have better solution?

Thank you very much for your help!

回答1:

Much better solution, let windows do it for you using Scheduled Tasks.

If it only needs to be executed once a day, then I would go for this. Even Google does it ;)

EDIT:

To answer the comment, it is as Fredrik has said. It is an Advanced Option, which you can open as the task is set up, containing a checkbox called: "Run only if logged on", which is false to begin with.

回答2:

Write a console app or equivalent, and use the Windows Scheduler (or whatever it's called nowadays...) to run it daily.

回答3:

For a flexible solution, you could use this. It's not a Windows service, but you could easily incorporate it into one. Or you might consider Quartz.NET which is reputed to be industrial strength (the Java version certainly is).

回答4:

I've used Scheduled Tasks successfully for backups, but I have a word of caution ...

Scheduled tasks are not be performed if you log out. I'm not sure if this can be overidden, but I have been caught out by tasks not performed because Windows automatically updates, reboots and sits waiting for me to log-in.

I disabled automatic updates - Windows should ASK first.

Another consideration is that 3AM is a time when many users would normally be logged out.

回答5:

Other answers are good. I just thought I'd point out that

compare the DateTime.Now with 3am

is a bad solution, even if you sleep for some time between each check, as it wastes system resources unnecessarily (not only in repeatedly checking the time, but also in the memory usage of the program).

回答6:

If you are expecting a file every night, instead of worrying about when it arrives, just get an event fired when it does.

Look at:

System.IO.FileSystemWatcher

File System Watcher on MSDN

回答7:

Why not set this up to run as a scheduled task. Have it execute and then exit. Set up Windows to start the process as a scheduled task at 3:00 AM daily.

回答8:

System.Threading.Timer might work out for you.

Documented here