Question Sleeping threads

[joshuadeboer]

Hi,
I'm trying to sleep a single thread of code,
when i try using System.Threading.Thread,
it freezes the whole app,
i need it to just freeze a portion of code.

 

[JohnH]

You need to create a secondary thread, check into the classes BackgroundWorker, ThreadPool and Thread for how to do worker threads. I would read some general multi-threading tutorials also.

 

[joshuadeboer]

Thanks a lot!

 

[joshuadeboer]

It works using backgroundworker but now i need to cross thread

 

[JuggaloBrotha]

You need to do some delegation and you'll need to do some Invoke checking on the controls in the delegated sub.

Here's an article explaining it: How to make cross-thread calls to windows forms controls : make, calls, how, cross, thread

Here's another example (it's in c# though): CodeProject: How to Properly Handle Cross-thread Events and Update a Label with BeginInvoke and BackgroundWorker. Free source code and programming help

 

[JohnH]

You some times have to do that, some times not. If you need to retrieve values from controls that the worker will process you can (and should) most likely get these values before starting the work and pass them on to the worker, usually with the RunWorkerAsync(Object) method. If you need to access the controls to report any kind of progress you can use the ProgressChanged and RunWorkerCompleted events of the Bgw, no need to Control.Invoke for this as these events are raised on UI thread. Learning how to invoke is still very useful to learn.

 

[joshuadeboer]

I'm trying to get and set values, mainly from a ListView control.

JuggaloBrotha's link didn't work (not signed up with Experts Exchange.

Please post any links you know of for cross-threading or Control.Invoke.

Thanks a lot!

 

[JohnH]

You can also use the help system, here's the online pages for some topics I looked up in local help:
Control.Invoke Method (System.Windows.Forms)
Delegates in Visual Basic
How to: Make Thread-Safe Calls to Windows Forms Controls

 

[JuggaloBrotha]

JuggaloBrotha's link didn't work (not signed up with Experts Exchange.

I'm not signed up there either, scroll to the bottom to see the solution(s).

 

[joshuadeboer]

Thanks for the links JohnH, I tried JuggaloBrotha's link again, and it still doesn't work, can't view the solution, only the question.

Thanks for the help!

 

[joshuadeboer]

Can anyone enplane the "Method As System.Delegate"?

Thanks

 

[picoflop]

Quick and Dirty ... you can use the Background Workers "ReportProgress" Event. This event runs in the context of the calling thread and an "object" can be passed.

Usually I use "PercentProgress" as selector in a select case statement inside that handler and depending on the code in side, I cast the object accordingly.