ASP.NET MVC April CodePlex Source Push

Microsoft hat eine neue Version des MVC Frameworks auf Codeplex released.

Update: Scott Guthrie hat nun einige Zeilen zu dem neuen “Release” geschrieben – es ist nicht die MVC Preview 3, sondern eine “Preview” der “Preview”

Wie bereits im Forum vom ASP.NET Team angekündigt, wurden die ActionFilter erweitert. Hier die Zusammenfassung von der Codeplex Seite:

MVC Changes Since Preview 2

• Action methods on Controllers now by default return an ActionResult instance, instead of void.
  • This ActionResult object indicates the result from an action (a view to render, a URL to redirect to, another action/route to execute, etc).
  • Each “result” is a type that inherits from ActionResult. To render a view, return a RenderViewResult instance.
• The RenderView(), RedirectToAction(), and Redirect() helper methods on the Controller base class now return typed ActionResult objects (which you can further manipulate or return back from action methods).
• The RenderView() helper method can now be called without having to explicitly pass in the name of the view template you want to render.
  • When you omit the template name the RenderView() method will by default use the name of the action method to determine the view template to render.
  • So calling RenderView() with no parameters inside the About() action method is now the same as explicitly writing RenderView(‘About’).
• Introduced a new IActionFilter interface for action filters. ActionFilterAttribute implements IActionFilter.
• Action Filters now have four methods they can implement representing four possible interception points.
  • OnActionExecuting which occurs just before the action method is called.
  • OnActionExecuted which occurs after the action method is called, but before the result is executed (aka before the view is rendered in common scenarios).
  • OnResultExecuting which occurs just before the result is executed (aka before the view is rendered in common scenarios).
  • OnResultExecuted which occurs after the result is executed (aka after the view is rendered in common scenarios).
  • NOTE: The OnResult* methods will not be called if an exception is not handled during the invoking of the OnAction* methods or the action method itself.
• Added a MapRoute extension method (extension on RouteCollection) for use in declaring MVC routes in a simpler fashion.

NOTE: It is pretty easy to update existing Controller classes built with Preview 2 to use this new pattern (just change void to ActionResult and add a return statement in front of any RenderView or RedirectToAction helper method calls).
Routing changes since Preview 2

• URLs may contain any literal (except for /) as a separator between URL parameters. For example, instead of {action}.{format} you can now have {action}-{format}. For more details on changes, see this post.
• Routing is ignored for files that exist on disk by default. This can be overriden by setting the RouteTable.Routes.RouteExistingFiles property to true (it is false by default).

Was das im Detail bedeutet und was man nun alles feines machen kann, werde ich mir mal in den nächsten Tagen anschauen

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