Hi Peter,
From your description, I understand that you want to call some webservice
in ASP.NET web page, and also want to let the page be updated automatically
when a certain value on server-side get changed(by webservice), correct?
As for the webservice and page, I'd like to confirm the following things:
1. is the webservice method(called in page) a long run webmethod which will
take long time? And is it a local webservice with the ASP.NET pages(in same
project) or a remote one?
2. How do you call it currently? If local, you can call it via ajax, or if
it is a remote one, you have to postback to server-side to call the
webservice.
As far as I know, since webservice itself doesn't support built-in callback
interface to notify client. The common approach to get notify (when a state
at server-side changed) is using timer+polling. In ASP.NET 3.5
application, this can be done via AJAX client-side script. Here is the work
you need to do in the page:
** add a local webservice in ASP.NET project (or a static page method ) so
that you can use AJAX to call it
#Calling Web Services from Client Script in ASP.NET AJAX
http://www.asp.net/AJAX/Documentatio...WebServicesWit
hAJAXTutorial.aspx
** in page, after you have called that long-run webservice, you can use
javascript to constantly call the above webmethod to query the state at
server-side.
Or you can directly use the AJAX timer control to do this either:
http://www.asp.net/ajax/documentatio...merControl.asp
x
Here are some other web articles introduced some means for implement such
long-run task + status query:
#Real-Time Progress Bar With ASP.NET AJAX
http://www.singingeels.com/Articles/..._ASPNET_AJAX.a
spx
#Display data updates in real-time with AJAX
http://encosia.com/2007/07/25/displa...ime-with-ajax/
If you have anything unclear on the specific part, please feel free to let
me know.
Sincerely,
Steven Cheng
Microsoft MSDN Online Support Lead
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--------------------
>From: "Peter" <cz****@nospam.nospam>
Subject: Auto Refresh Example
Date: Wed, 8 Oct 2008 16:24:58 -0500
I have a APS.NET 3.5 webpage which calls a web service.
What I need is to update this page automatically when a value changes in
the
>webservice, does anyone have an example?
Thank You
Peter
