DevForce Community Forum : Question on Views and ViewModels http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2010 : Question on Views and ViewModels Sat, 11 Apr 2026 19:09:48 -700 Sat, 25 Sep 2010 12:23:32 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=2190 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Question on Views and ViewModels : I agree. The SaleInvoiceView should... http://www.ideablade.com/forum/forum_posts.asp?TID=2190&PID=8634#8634 Author: BillG
Subject: 2190
Posted: 25-Sep-2010 at 12:23pm

I agree. The SaleInvoiceView should have a SalesInvoiceViewModel but does the SalesInvoiceLineView need a separate ViewModel or can it share the SalesInvoiceViewModel since the SalesInvoiceLineView is a child view of the SalesInvoiceView and can't exist without it.
 
Bill
 
]]> Sat, 25 Sep 2010 12:23:32 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=2190&PID=8634#8634 Question on Views and ViewModels : Hi Bill,I'm wondering... http://www.ideablade.com/forum/forum_posts.asp?TID=2190&PID=8633#8633 Author: Peer
Subject: 2190
Posted: 25-Sep-2010 at 12:07pm

Hi Bill,
I'm wondering about the same issue (http://www.ideablade.com/forum/forum_posts.asp?TID=2189&PID=8621#8621) and in my own words:

I think the viewmodel acts like  a businessprocess container with all the possible actions for a certain businessprocess. Additonally you add enough commands and navigation handles to let the view interact with the viewmodel.

Your Invoice screen handles the businessprocess "SalesInvoices" so in my opinion you should have ha viewmodel "SalesInvoiceViewModel" which contains all the entities , logic, validationrules ?? navigation (next,prev) and so on.

When I'm wrong, please let me know :)
Peer




Edited by Peer - 25-Sep-2010 at 12:11pm]]> Sat, 25 Sep 2010 12:07:08 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=2190&PID=8633#8633 Question on Views and ViewModels : Some people say that you should... http://www.ideablade.com/forum/forum_posts.asp?TID=2190&PID=8624#8624 Author: BillG
Subject: 2190
Posted: 24-Sep-2010 at 1:16pm

Some people say that you should have one viewmodel per view. But I am wondering if that is always true. For example, you have a SalesInvoiceView which is divided into the upper portion of the form for the header information and the lower portion of the form for the detail lines in a grid. The SalesInoivceViewModel class holds an observablecollection of salesInvoiceLines which fill the grid. Next to the grid is Add/Edit/Delete buttons which pop up a window for the user to enter the detail lines etc in a form called SalesInvoiceLineView. I think that that this view should be passed the parents viewmodel and both views should share it.
 
Can anyone give me a good reason why I need two viewmodels in this case?
 
Bill
 
]]> Fri, 24 Sep 2010 13:16:36 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=2190&PID=8624#8624