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 !

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