ASP.NET MVC

Re: MVC - Model binding with multiple entities on the same page

paul.vencill — Sat, 04 Jul 2009 13:02:47 GMT

You can do this w/ ModelBinding, yes. See my answer to your other post about using a viewmodel to wrap two models. You can do collection-based binding by accepting a List<yourviewmodeltype> parameter in the controller's POST action, and following the right syntax in the view.

Here's a good exampel of that. http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx

You can also use helpers, in the manner that I showed in the other post; you just pass the index as a string like Phil shows.

Re: MVC - Model binding with multiple entities on the same page

gerrylowry — Sat, 04 Jul 2009 07:34:00 GMT

I am not an expert, however, I would say yes, you can. See http://msdn.microsoft.com/en-us/library/dd410405.aspx:
"Models and Model Binders in MVC Applications":

"Models are application specific, and therefore the ASP.NET MVC framework puts no restrictions on the kinds of model objects you can build."

"A model binder in MVC provides a simple way to map posted form values to a .NET Framework type and pass the type to an action method as a parameter. Binders also give you control over the deserialization of types that are passed to action methods. Model binders are like type converters, because they can convert HTTP requests into objects that are passed to an action method. However, they also have information about the current controller context."

Read the full article at the above link.

See also http://nerddinnerbook.s3.amazonaws.com/Part2.htm where a one to many* foreign key relationship is set up and http://nerddinnerbook.s3.amazonaws.com/Part3.htm where the developers of NerdDinner "use LINQ to SQL to create a simple model that corresponds fairly closely to our database design".

* in your case, it seems like you are using a one to one relationship. I tend to think of one to one as a special case of one to many. Keep in mind that I am not a database expert.

Regards,
Gerry (Lowry)

Re: MVC - Model binding with multiple entities on the same page

LeMerovingian — Sat, 04 Jul 2009 06:59:47 GMT

Thanks for your reply. I am wondering how to do this if I want to display data from a collection (of which the collection comprises of data from two different entities).

Can I do this with Model Binding?

Re: MVC - Model binding with multiple entities on the same page

gerrylowry — Sat, 04 Jul 2009 01:19:27 GMT

My guess, something like this:

private YourFirstTableDBEntities _dbFirst = new YourFirstTableDBEntities();
private YourSecondTableDBEntities _dbSecond = new YourSecondTableDBEntities();

on your .aspx page:

Html.Encode(itemFirst.somefield)   Html.Encode(itemSecond.someotherefield)

et cetera

Regards.
Gerry (Lowry)

MVC - Model binding with multiple entities on the same page

LeMerovingian — Fri, 03 Jul 2009 14:17:03 GMT

I am wondering how to use Model Binding in a scenario where I am returning information from more than one entity on a page?

I want to display a combination of fields from two separate entities, ie Customer + Address. I am using Microsoft's DAAB and custom business entities for my model.

Any ideas?