Mvc3 self validating models
These kinds of errors are handled by the model-binding system before validation even happens.In MVC 1.0, these two situations were represented by the messages "The value 'dog' is not valid." and "A value is required." In the early MVC 2 previews, we added a pluggable validation system, and in-box we provide support for the validation attributes in System. Data Annotations (as well as backward compatibility with IData Error Info, though we suggest people migrate away from that at their convenience).Validating user inputs is an very important step in collecting information from users because it helps you to prevent errors during processing data. In case, if you get compile time error(s) then simply remove the reference of System. Incomplete or improperly formatted user inputs will create lot of problems for your application. NET MVC 3 makes it very easy to validate most common input validations. NET MVC 3 includes Required, String Length, Range, Regular Expression, Compare and Remote validation attributes for common input validation scenarios. It's null because we didn't bind any values into Home Address, and therefore never manufactured a new Home Address object.Let's expand our view to include just the street of the address: Now we'll get errors about missing values for City, State, and Zip, because this time we've bound at least one value inside of Home Address (namely, Street).We run the property-level validators first, and if all of those succeed, we'll run the model-level validators.In the case of our Contact object with [Required] on the editable properties, if you accidentally left off the Last Name property (or a bad guy "under-posted" the form without it), the validation system would see the null Last Name value and trigger the error message.
Switching to Model Validation might make it easier to address "under-posting" in certain scenarios, but we're by no means completely safe yet.More importantly, I want to re-address the security issues I brought up in the last post, now in the context of Model Validation, to understand whether this change makes your applications more secure.