Mvc3 self validating models sunday mail dating

If it doesn't include a value, then model binding is skipped, which means the model binding failure won't occur.

Additionally, when the [Required] validator is run, it queries the value from the model -- which will contain the value-types default value, typically 0 -- and say "that's not null, everything is all good here! If you make the property a nullable version of the value type, say by turning "int" into "int?

The prevailing feature of Input Validation is that we would only run the validators for properties for which there were form inputs.

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Mvc3 self validating models

Literally, the implementation of the [Required] attribute is that the value cannot be null.

Since a non-nullable value type can never be null, the [Required] attribute doesn't actually ever say the field is invalid. Failing to provide a value for a non-nullable property is actually a model binding error, as I mentioned above.

But what if the user wasn't offered the chance to edit that field? More importantly, what if a bad guy decided to try to "under-post" your form by leaving off the Last Name field? What this means is that we will always run all validators on an object, if that object had at least one value bound into it during model binding.

We run the property-level validators first, and if all of those succeed, we'll run the model-level validators.

Let's expand our Contact object to include address information: When we say we're running the "Contact.

Home Address" validators there, what I mean is that we're running any validators that are on the property itself, or on the Address type as model-level validators.If the Home Address property had a [Required] attribute on it, it would fail, because Home Address would be null.It's null because we didn't bind any values into Home Address, and therefore never manufactured a new Home Address object.", you'll be able to use [Required] as a way to ensure that a value is posted.Another anomaly with [Required] happens when you use an ORM system like LINQ to SQL or Entity Framework.The Default Model Binder class had validation hooks as well as built-in support for IData Error Info for validation.

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