Best practices for debugging ASP.NET MVC Binding

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Although @russ’s answer is useful and will sometimes be necessary, both options seem a little low level when the main question is more about the big picture. Thus, I’d recommend Glimpse.

From its about page:

… Glimpse allows you to debug your web site or web service right in the browser. Glimpse allows you to “Glimpse” into what’s going on in your web server. In other words what Firebug is to debugging your client side code, Glimpse is to debugging your server within the client.

And since you’ve specifically asked about data binding, you’ll want to look at the binding tab documentation. You’ll be able to see, again from the docs:

  1. Ordinal: Order in which the MVC Model Binding infrastructure attempted to bind the available data
  2. Model Binder: Model Binder that was used in a given scenario
  3. Property/Parameter: Name of the thing that the Binder was trying to bind
  4. Type: Type of the thing that the Binder was trying to bind
  5. Attempted Value Providers: Providers that the Binder attempted to use to get a given value (and whether it was successful)
  6. Attempted Value: The actual value that the provider has to work with (post type conversation, etc.)
  7. Culture: The culture that was used to parse the raw value
    Raw Value: The raw value that the provider has to work with (pre type conversation, etc.)

See the quick start. Briefly:

  1. Install the glimpse.mvc3 package
  2. Go to http://yourhost/yourapp/Glimpse.axd and “turn it on.”
  3. Click on the glimpse icon on the bottom right of any view in your app for details.

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