Re: How to display page while long-running process executing?
- From: stcheng@xxxxxxxxxxxxxxxxxxxx (Steven Cheng[MSFT])
- Date: Fri, 16 Mar 2007 06:56:52 GMT
Hello lmttag,
Regarding on such waring page for longrun task, in ASP.NET, we have the
following approachs so far:
1. Start the server-side long run task in a certain postback event, and
then in client-side page, use script (or html <meta> tag) to constantly
postback the page to check for the server-side task status(use session
variable ). If the task finished, stop those constantly postback script and
display final result.
2. During the time without ajax, we have the option to use some client-side
XMLHttp post component to send http request to server-side(to poll status
of the server-side long run task). This way, we can avoid constantly
refreshing the web page(as #1 does).
here are some web articles introduced some of such approaches:
#How To: Submit and Poll for Long-Running Tasks
http://msdn2.microsoft.com/en-us/library/ms979200.aspx
#Building a Better Wait Page
http://www.codeproject.com/aspnet/wait_page.asp
#Solve the Page Waiting Game with Threaded AJAX
http://www.devx.com/asp/Article/29617
3. Nowadays, we have the AJAX based pattern, it is somewhat like the #2,
but leverage existing ajax components. The microsoft AJAX framework just
provide such a well encapsulated AJAX framework that can help us build AJAX
web application. Here for long run task, you can start it in a certain
postback event, and then let the client-side call a AJAX webservice
function to constantly poll the status of the server-side task.
Here are reference about calling webservice in ASP.NET ajax application(and
the whole tutorial):
#Calling Web Services from Client Script in ASP.NET AJAX
http://ajax.asp.net/docs/tutorials/ConsumingWebServicesWithAJAXTutorial.aspx
#ASP.NET AJAX Roadmap
http://ajax.asp.net/docs/default.aspx
Hope this helps. if you have any more specific questions, welcome to
discuss here also.
Sincerely,
Steven Cheng
Microsoft MSDN Online Support Lead
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