DevForce Community Forum : PhoneItemViewModel http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : Community Forum : PhoneItemViewModel Sat, 27 Jun 2026 11:16:46 -700 Thu, 21 Feb 2013 07:22:32 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=3994 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ PhoneItemViewModel : Thanks, good points. Greg http://www.ideablade.com/forum/forum_posts.asp?TID=3994&PID=15889#15889 Author: gregweb
Subject: 3994
Posted: 21-Feb-2013 at 7:22am

Thanks, good points.

Greg]]> Thu, 21 Feb 2013 07:22:32 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3994&PID=15889#15889 PhoneItemViewModel : The properties/actions/logic in... http://www.ideablade.com/forum/forum_posts.asp?TID=3994&PID=15882#15882 Author: mgood
Subject: 3994
Posted: 20-Feb-2013 at 1:56pm

The properties/actions/logic in the ItemViewModel have nothing to do with the entity's persistence state. They are purely for the current UI. It's a separate concern that has no business in the entity. If you later on decide to change the UI the need for the current ItemViewModel may go away or requires enhancements. Neither one should require a change to the entity. 

This is also captured by the Open Close Principle (OCP). Changing the UI should not result in a modification to the entity.

http://c2.com/cgi/wiki?OpenClosedPrinciple
]]> Wed, 20 Feb 2013 13:56:14 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3994&PID=15882#15882 PhoneItemViewModel : In looking at the Viewmodel structure,... http://www.ideablade.com/forum/forum_posts.asp?TID=3994&PID=15879#15879 Author: gregweb
Subject: 3994
Posted: 20-Feb-2013 at 9:43am

In looking at the Viewmodel structure, I notice that there is a PhoneItemViewModel. So instead of binding to a collection of Entities, you can bind to a collection of PhoneItemViewModels.

It seems the properties and functions of the ItemViewModel could have been made a part of the partial entity class.

The disadvantage I see of an ItemViewModel is that you can then no longer use convention binding of Caliburn.Micro. Instead, you have to manually bind to Item.Property.

The advantage I see is that it keeps the ViewModel properties out of the Entity.

Just wondering what your take is on the matter.

Greg]]> Wed, 20 Feb 2013 09:43:13 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3994&PID=15879#15879