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.NET Forum / Languages / C# / February 2008Linq and Validation Application Block (Enterprise Library)
Does anybody know if it is possible to use the Validation Application Block from Enterprise Library 3.1 in Linq. The problem is that I don't know how to add the validation attributes to the generated properties. Thanks in advance, Evert Evert, You can't through the designer. There is no way to add attributes through the designer to the classes. You could modify the designer-generated code, but it might be overwritten by the designer. There is no good solution to this, I am afraid.  Signature- Nicholas Paldino [.NET/C# MVP] - mvp@spam.guard.caspershouse.com > Does anybody know if it is possible to use the Validation Application > Block [quoted text clipped - 5 lines] > > Evert Hmm... I am searching for a good technology for my new application. (Sort of time management on web). I thought the Validation Application Block was good for my business objects. And LINQ to SQL is good for getting the data from the database. But if it is not possible to use the VAB i can't use linq. Do you have a better solution? I like the VAB a lot. It is easy to use, fast to program and very sollid. With the AJAX validation controls it is also easy to use in the GUI. Best regards, Evert > Evert, > [quoted text clipped - 13 lines] > > > > Evert Evert, Well, there is no reason you can't code the objects that LINQ uses yourself. You can then apply whatever attributes you wish. You can easily create class definitions which LINQ can use. Here is a link to the section of the MSDN documentation titled "The LINQ to SQL Object Model", which should help: http://msdn2.microsoft.com/en-us/library/bb386989.aspx Signature- Nicholas Paldino [.NET/C# MVP] - mvp@spam.guard.caspershouse.com > Hmm... I am searching for a good technology for my new application. (Sort > of [quoted text clipped - 31 lines] >> > >> > Evert Hi Nicholas, Can you tell me what you mean with code myself? Do I need to code sort-of copies of the LINQ entities that are created? How do I fill these entities? Do I need to do this manually? Br, Evert > Evert, > [quoted text clipped - 42 lines] > >> > > >> > Evert Evert, Yes, I am suggesting that you create the classes manually. The entities that the LINQ-to-SQL designer creates aren't special in any way, and there is nothing that is preventing you from creating them yourself. You just have to have the proper attributes added to them which allow for the mapping from the type to the database (the Table and Column attributes, mainly, although I believe there are others). The link I pointed you to should show you how to attribute your own classes to use with a DataContext instance and execute a LINQ query to populate instances. Then, since you have control over the code, you can apply your own validation attributes that you wish to apply. Signature- Nicholas Paldino [.NET/C# MVP] - mvp@spam.guard.caspershouse.com > Hi Nicholas, > [quoted text clipped - 61 lines] >> >> > >> >> > Evert Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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