DTO objects design c# asp.net mvc2

Question

Should I put my DTO objects inside my domain service / business layer?

Can such properties have data annotations, is this good practice? Especially for client side validation with asp.net mvc 2? (I dont have access to asp.net mvc3 otherwise I would have access to the IClientValidator? or something similar interface)...

Otherwise all my valdiation is in c# and I bubble any errors up to the UI or web project

I hope to translate the DTO to Entities inside my domain service layer so answers to the above is appreciated..

jgauffin · Accepted Answer · 2011-05-05 08:57:14Z

2

You should put your DTOs in a separate assembly to avoid layer coupling.

Read more here: http://martinfowler.com/eaaCatalog/separatedInterface.html

Can such properties have data annotations, is this good practice

Yes, I think so. Since it enables all layers to validate the object without code duplication. Attributes are also added to sandcastle generated help files which lets everyone reading it see what contract requirements your models/DTOs has.

answered May 5, 2011 at 8:57

jgauffin

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3 Comments

Haroon Over a year ago

Thanks... the data annotations I will only really use for asp.net mv2 if I move onto v3 i will use the options available there...

jgauffin Over a year ago

I'm using DataAnnotations in mvc3 too. What other options are you referring to?

Haroon Over a year ago

client side validation... I think in mvc3 as far as I can remember there is an option to hook onto the client side validation, the way I have done my business logic is in c#, I would implement the relevant interface so client side validation can also be shown to the user... I dont think I understood this correctly and I think I may need to look into this... Do you know a way I could hook onto the client side validation in mvc2 without using data annotations?

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