ASP.NET MVC 1.0 Release Candidate Now Available
page 4 of 20
by Scott Guthrie
Feedback
Average Rating: This article has not yet been rated.
Views (Total / Last 10 Days): 67460/ 188

Add View Command

You can now type Ctrl-M, Ctrl-V within a Controller action method, or right-click within an action method and choose the “Add View” context menu item to create new view templates:

Figure 4

-

This will cause an “Add View” dialog to appear that allows you to name and create a new view (it is pre-populated with convention-based options).  It allows you to create “empty” view templates, or automatically generate/scaffold view templates that are based on the type of object passed to the view by the Controller action method.  The scaffolding infrastructure uses reflection when creating view templates – so it can scaffold new templates based on any POCO (plain old CLR object) passed to it.  It does not have a dependency on any particular ORM or data implementation.

For example, below we are indicating that we want to scaffold a “List” view template based on the sequence of Product objects we are passing from our action method above:

Figure 5

Clicking the “Add” button will cause a view template to be created for us within the \Views\Products\ directory with a default “scaffold” implementation:

Figure 6

We can then run our application and request the /products URL within our browser to see a listing of our retrieved products:

Figure 7

The RC ships with a number of built-in scaffold templates: “Empty”, “List”, “Details”, “Edit” and “Create” (you can also add your own scaffold templates – more details on this in a moment). 

For example, to enable product editing support we can implement the HTTP-GET version of our “Edit” action method on our Products controller like below and then invoke the “Add View”

Figure 8

Within the “Add View” dialog we can indicate we are passing a “Product” object to our view and choose the “Edit” template option to scaffold it:

Figure 9

Clicking the “Add” button will cause an edit view template to be created with a default scaffold implementation within the \Views\Products\ directory

Figure 10

We can then run our application and request the /products/edit/1 URL within our browser to edit the Product details:

Figure 11

To save edit changes we can implement the HTTP-POST version of our “Edit” action method on our Products controller:

Figure 12

Notice in the code above how in the case of an error (for example: someone enters a bogus string for a number value) we redisplay the view.  The “edit” and “create” scaffold templates contain the HTML validation helper methods necessary to preserve user input and flag invalid input elements in red when this happens:

Figure 13

You’ll rarely end up using a scaffold-created template exactly as-is, and often will end up completely replacing it.  But being able to get an initial implementation up and running quickly, and having an initial view template for your scenario that you can then easily tweak is really useful.

Because the scaffold infrastructure supports scaffolding views against any plain-old CLR object, you can use it with both domain model objects (including those mapped with LINQ to SQL, LINQ to Entities, nHibernate, LLBLGen Pro, SubSonic, and other popular ORM implementations) as well as to create scaffolds with custom Presentation Model/ViewModel classes.


View Entire Article

User Comments

Title: Awesome article, great work!   
Name: George Loew
Date: 2009-03-25 12:20:05 AM
Comment:
excellent article, scott! It is very useful and contain excellent information about ASP.NET MVC framework. I have had a chance to try this ASP.NET MVC technology with my current host (asphostcentral.com) and everything works beautifully.

I am rating 5 stars for this article and I am looking forward to your next articles.
Title: Cache Photo   
Name: Meysam
Date: 2009-03-05 2:14:50 AM
Comment:
Hi,
Is it possible to send cache status (304) in response to subsequent requests for a photo?

Product Spotlight
Product Spotlight 





Community Advice: ASP | SQL | XML | Regular Expressions | Windows


©Copyright 1998-2024 ASPAlliance.com  |  Page Processed at 2024-05-27 8:05:34 AM  AspAlliance Recent Articles RSS Feed
About ASPAlliance | Newsgroups | Advertise | Authors | Email Lists | Feedback | Link To Us | Privacy | Search