The constructor of your SelectList above is accepting a listing of countries and regions to populate the drop-downlist with, in addition to the at present picked worth.
In this manner, ViewModel can help us to arrange and manage details inside a strongly typed view in a more flexible way than advanced objects like models or ViewBag/ViewData objects.
A view model represents the data that you would like to Show on your view/page, regardless of whether it's useful for static text or for enter values (like textboxes and dropdown lists) that could be additional towards the databases (or edited). It is one thing different than your area model. It is a model to the view.
Also I did explore binding the development of the widget "new_widget_event' to a website page amount item to trace them but the original cause of undertaking that turned OBE. So I'd revisit that afterwards. many thanks for all the help I will submit a modified Edition of what you proposed but set explain why I like it improved.
I discover myself making use of ViewModels to move the info into a view/form, and then transferring that data into a sound Model in the event the sort posts back again for the controller - also really handy for storing Lists(IEnumerable).
Separation of Problems: View models different the presentation layer from the company logic and info accessibility layers. What this means is views are not dependent on the database schema or domain logic, marketing cleaner plus much more maintainable code.
Occasionally it's important that the Model you should get to View differs from the authentic Model, that's any time you have to have ViewModel.
(That features things like SelectLists. Neither your controller nor view should really should know how to develop a SelectList for any dropdown.)
.Thanks with the clarification . But , Imagine if my area model is made up of twenty fields and i need 2 extra added fields. Do, i really need to put all All those fields view model in asp.net mvc within the view model which might be already there in Domain model..
public class AddViewModel general public int a get; established; general public int b get; established; community int Complete get; set;
Here's a way we might re-element the buy presentation model these that it becomes a true view model and will be beneficial for displaying an individual PresentationOrder object or a group of PresentationOrder objects:
Any time a Controller course decides to render an HTML response again into a client, it is actually chargeable for explicitly passing on the view template each of the information required to render the response.
To my being familiar with, it's a kind of Model that includes a distinct goal of interacting Using the View? Or a little something like that?
For this later on situation, you might have the motion process update a ViewModel item With all the type-posted details, then use the ViewModel instance to map or retrieve an true domain model object.