I have a form that has many long-methods. My quest is: What is the best practice? Use anonymous method and only one backgroundworker or create an instance of BackgroundWorker to each long-method.
Please help. Thanks.
+1
A:
I would personnaly use one instance of BackgroundWorker for each of your tasks. However, keep in mind that you may call several times the same delegate method in multiple different instances of thread.
By having one BackgroundWorker per long-method task, you will have plenty control over your methods. Furthermore, as far as my understanding goes, once an instance of a BackgroundWorker performs a task, it is busy with this background task and therefore making it unavailable for others. I may perhaps be mistaken though, but that is anyway the way I would do it, as your DoWork() event handler can do only what it is asked to do for this BackgroundWorker. So, it seems impossible to me to perform totally different tasks for only one instance of BackgroundWorker.
Does this help?
Will Marcouiller
2010-03-10 18:41:33
Yes, this help. My long-methods don't have consecutive runs. I'll use you recommendation. Sorry for poor english...
reikara
2010-03-10 18:52:56
Don't bother, I'm francophone! =P Hehehe...
Will Marcouiller
2010-03-10 19:03:45
Perhaps this would help if you split your decouple your long-as-in-long-running-method ;) into multiple smaller pieces and schred the little pieces into other multiple BackgroundWorkers. It all depends if these methods can be chewed into smaller pieces of code, if you see what I mean.
Will Marcouiller
2010-03-10 19:06:59
+2
A:
In summary:
Advantages in one BackgroundWorker:
You control the order of the execution for the multiple method. However, this is also a disadvantage, because if you use multiple BackgroundWorkers, you "assume" they are executed parallely and not have to worry about the order;
Less overhead for thread creation and disposal (if possible, use same instance every time, but that's not always possible, depending on what starts the process. It's not possible if you want it to be done concurrently);
If you want to communicate between thread, you can accumulate a batch communication and do it more efficiently. Moreover, it may save you some of that communication if all methods are run in the same thread.
Advantages in multiple BackgroundWorkers:
The aforementioned parallelism;
Each end-of-process can use another delegate and therefore do some other operation.
Hope it helps!