Enterprise Library 3 (Validation Application Block)

 

Enterprise Library 3 has been released a few days ago by Microsoft; it includes 2 new application blocks :

 

The Validation Application Block.

The Policy Injection Application Block.

 

Here is a first look of the Validation Apllication Block (VAB).

 

The VAB allows developers to create validation rules that they can use in their applications.

 

• Create a project and make a reference to the VAB assembly :

 

• Here is a Student class ; we want the Name size to be between 1 and 10 and not null and its Emailaddress to be not null : The VAB provides the appropriate Attributes classes :

• Now, if we run the following program with a valid student name, but no EmailAddress :

• We’ll get this :

 

• Now if we want to create our own custom validator, for instance we want to validate the email address (let’s say a valid email address must contain a ‘@’); you must first create a validator class and later a validator attribute class ; here is the validator class :

 

• And here is the Validator attribute :

•  There are many other validators…Take a look at the documentation and enjoy !