DataModel-View-ViewModel pattern: 1

re: DataModel-View-ViewModel pattern: 1

Joe — Mon, 24 Jul 2006 20:48:23 GMT

Trying to understand your distinction between VM and DM. Is it right to say that a DataModel holds the data (or wraps the data) but the ViewModel holds view specific state like sort order, filtering etc...?
In some cases you don't need a ViewModel because WPF provides it for you (DataTemplates etc..)

If this is right then isn't your ViewModel the same as John Gossman's? The only difference is that you have a DataModel and he has a plain Model.

re: DataModel-View-ViewModel pattern: 1

dancre — Tue, 25 Jul 2006 02:22:35 GMT

A ViewModel is a bit more than that. It basically contains all of the behavior for a view and the view will have no codebehind. I hope it will become more clear as I build up an example. One of the key things is that it exposes things like commands and may aggregate several different DataModels.

Hello Tuesday

Okoboji: a lake, a mythical university, Kevin Moore's blog — Wed, 26 Jul 2006 03:50:31 GMT

Control Licensing in Cider (WPF designer for VS) James provides some great information on supporting...

WPF Patterns

Bryant Likes's Blog — Wed, 27 Sep 2006 23:31:00 GMT

If you're doing WPF development, you really need to check out Dan Crevier 's series on DataModel-View-ViewModel.

DataModel-View-ViewModel pattern series

Dan Crevier's Blog — Thu, 12 Oct 2006 05:00:52 GMT

I thought I should add a post with the full list of posts in the D-V-VM pattern. They are: DataModel-View-ViewModel

re: DataModel-View-ViewModel pattern: 1

Udi Dahan - The Software Simplist — Thu, 12 Oct 2006 15:57:27 GMT

By this:

"When data is expensive to fetch, it abstracts away the expensive operations, never blocking the UI thread (that is evil!). It also keeps the data "live" and can be used to combine data from multiple sources."

Do you mean that the data model is also responsible for when to communicate out? If so, I'd say that you're violating the Single Responsibility Principle.

re: DataModel-View-ViewModel pattern: 1

dancre — Thu, 12 Oct 2006 18:20:29 GMT

See part 6 for the activation model.