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Since ASP.NET MVC 1 reached its final release in April 2009, the developer community has been hard at work applying it to every conceivable task (and a few inconceivable ones). Through experience, we ve established best practices, new design patterns, and new libraries and tools to make ASP.NET MVC development more successful. Microsoft has watched closely and has responded by embedding many of the community s ideas into ASP.NET MVC 2. Plus, Microsoft noticed that certain common web development tasks were harder than expected in ASP.NET MVC 1, so it has invented new infrastructure to simplify these tasks. Altogether, the new features in ASP.NET MVC 2 are grouped around the theme of streamlining enterprise-grade web development. Here s a rundown of what s new: Areas give you a way to split up a large application into smaller sections (e.g., having a public area, an administrative area, and a reporting area). Each area is a separate package of controllers, views, and routing configuration entries, making them convenient to develop independently and even reuse between projects. See 8. Model metadata and templated view helpers are extensible mechanisms for describing the meaning of your data model objects (e.g., providing humanreadable descriptions of their properties) and then automatically generating sections of UI based on this metadata and your own design conventions. See 12. Validation is now far more sophisticated. Your model metadata can specify validation rules using declarative attributes (e.g., [Required]) or custom validators, and then the framework will apply these rules against all incoming data. It can also use the same metadata to generate JavaScript for client-side validation. See 12.

The client object model for ECMAScript/JavaScript is broken down into the namespaces shown in Table 6 2.

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Behind the scenes, when your controller is invoking one of its action methods and is trying to find suitable values for the method s parameters, it obtains values using framework components called value providers and model binders. Value providers represent the supply of data items available to your controller. There are built-in value providers that fetch items from Request.Form, Request.QueryString, Request.Files, and RouteData.Values. Then, model binders take all these data items and try to map them onto whatever type of parameter your method takes. The built-in default model binder can create and populate objects of any .NET type, including collections and your own custom types. You saw an example of all this working together at the end of 6, when you allowed administrators to post a form containing multiple fields and received all this data as a single Product object. To learn how these powerful, convention-based mechanisms work, including how different context objects are prioritized, how the system works recursively to populate entire collections and object graphs, and how it can use model metadata to validate incoming values, refer to the coverage of value providers and model binding in 11.

out regularWidth); int.TryParse(regularHeightNode.Value, out regularHeight); thumbnailUrl = thumbnailUrlNode.Value; int.TryParse(thumbnailWidthNode.Value, out thumbnailWidth); int.TryParse(thumbnailHeightNode.Value, out thumbnailHeight); PhotoAlbumProvider provider = PhotoAlbumService.Instance; provider.PhotoInsert(album, title, dateTaken, regularUrl, regularWidth, regularHeight, thumbnailUrl, thumbnailWidth, thumbnailHeight, true, true); } catch (Exception ex) { Utility.LogError("Error reading RSS item", ex); } count++; if (count > max) { break; } } } } public static void ExportFlickrPhotos(string tag) { WebClient client = new WebClient(); string feedUrlFormat = "http://api.flickr.com/services/feeds/" + "photos_public.gne tags={0}&format={1}"; string url = String.Format(feedUrlFormat, tag, "rss2"); byte[] data = client.DownloadData(url); MemoryStream stream = new MemoryStream(data); XmlDocument document = new XmlDocument(); XmlNamespaceManager nsmgr = new XmlNamespaceManager(document.NameTable); nsmgr.AddNamespace("media", "http://search.yahoo.com/mrss/"); nsmgr.AddNamespace("dc", "http://purl.org/dc/elements/1.1/"); document.Load(stream); document.Normalize();

If the framework can t find any match for a particular parameter, it will try to supply null for that parameter. This is fine for reference/nullable types (such as string), but for value types (such as int or DateTime) you ll get an exception.3 Here s another way to think about it: Value-type parameters are inherently compulsory. To make them optional, either specify a default value (see below) or change the parameter type to something nullable (such as int or DateTime ) so the framework can pass null if no value is available. Reference-type parameters are inherently optional. To make them compulsory (i.e., to ensure that a non-null value is passed), you must add some code to the top of the action method to reject null values. For example, if the value equals null, throw an ArgumentNullException.

I m not talking about UI validation here if your intention is to provide the end user with feedback about certain form fields being required, see the Validation section in 12.

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