Validating date

Below is an annotated model from an app that stores information about movies and TV shows.Most of the properties are required and several string properties have length requirements.The Bind Required attribute (also see Customize model binding behavior with attributes) is useful to ensure form data is complete.When applied to a property, the model binding system requires a value for that property.It saves time they would otherwise spend waiting for a round trip to the server.In business terms, even a few fractions of seconds multiplied hundreds of times each day adds up to be a lot of time, expense, and frustration.You can configure this number by inserting the following code into the and react appropriately.In many cases, the appropriate reaction is to return an error response, ideally detailing the reason why model validation failed.

For example, a user may have entered text in a field expecting an integer, or you may need to compute a value for a model's property. To do so, call the Validation attributes work for most validation needs.

Model state represents validation errors in submitted HTML form values.

MVC will continue validating fields until reaches the maximum number of errors (200 by default).

Just inherit from the attribute checks the genre first, and if it's a classic, then it checks the release date to see that it's later than 1960. The attribute accepts an integer parameter representing the year that you can use to validate data.

You can capture the value of the parameter in the attribute's constructor, as shown here: public class Classic Movie Attribute : Validation Attribute, IClient Model Validator { private int _year; public Classic Movie Attribute(int Year) protected override Validation Result Is Valid(object value, Validation Context validation Context) Client side validation is a great convenience for users.

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