Threading Timeout Question

[JMax]

Hello!

I have a question that I really can’t think of an answer for, but thought I
might as well give a shot here. I have a web service, created by the VS web
service creator. I have another class, clsWebservice, which provides easy
asynchronous access to each method in the web service. However, the problem
is sometimes a web service call might be dropped, and I want to watch for
that, with a timeout to tell the user that there’s a problem, and ask if he
wants to reissue the request. How would I do the timeout? The easiest answer
would seem to be the AsyncWaitHandle.WaitOne, with a timeout, but that stops
my main thread, so it can’t refresh during that time, and to the user, it
would look like it’s locking up. However, I also couldn’t find a way to start
a thread, and pass parameters through it to a function, to pass to the web
service, which would be ideal – because then it wouldn’t matter if I locked
up that thread.

I apologize; I am rather new at threading.

God bless,

Jose

[Jon Skeet [C# MVP]]

JMax <JM**@discussions.microsoft.com> wrote:

I have a question that I really can?t think of an answer for, but thought I
might as well give a shot here. I have a web service, created by the VS web
service creator. I have another class, clsWebservice, which provides easy
asynchronous access to each method in the web service. However, the problem
is sometimes a web service call might be dropped, and I want to watch for
that, with a timeout to tell the user that there?s a problem, and ask if he
wants to reissue the request. How would I do the timeout? The easiest answer
would seem to be the AsyncWaitHandle.WaitOne, with a timeout, but that stops
my main thread, so it can?t refresh during that time, and to the user, it
would look like it?s locking up. However, I also couldn?t find a way to start
a thread, and pass parameters through it to a function, to pass to the web
service, which would be ideal ? because then it wouldn?t matter if I locked
up that thread.

I apologize; I am rather new at threading.

You could start a timer on your main thread, as an option. For how to
effectively pass parameters, see
http://www.pobox.com/~skeet/csharp/t...rameters.shtml

(You might want to read the rest of the article for general threading
help.)

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Derrick Coetzee [MSFT]]

JMax wrote:

However, the problem is sometimes a web service
call might be dropped, and I want to watch for that, with a timeout
to tell the user that there's a problem, and ask if he wants to
reissue the request. How would I do the timeout? [...] However, I also
couldn't find a way to start a thread, and pass parameters through
it to a function, to pass to the web service [...]

Hi Jose. Probably the best way to do this is using a System.Threading.Timer
object. You can specify a time and a callback function and a threadpool
thread will invoke your callback after the given amount of time has passed.
The TimerCallback delegate takes a state object that allows you to pass data
to the callback, but this isn't strictly necessary; it's always possible to
create a temporary object which holds both the data and the callback. This
is how you can get data to a new thread - just create an object, passing
some data to its constructor, and then call a "Run" or "Start" method on
that object which invokes Thread.Start() on one of its own methods. I hope
this helps.
--
Derrick Coetzee, MCP, MSFT (Speech Server)
This posting is provided "AS IS" with no warranties, and confers no
rights. Use of included code samples are subject to the terms
specified at http://www.microsoft.com/info/cpyright.htm