Validating with a Service Layerhttp://www.asp.netMon, 06 May 2013 17:07:18 GMTumbracoComments for Validating with a Service LayerenComment Posted by tavanaonlinehttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csTue, 03 Aug 2010 20:47:43 GMT00000000-0000-0000-000000009736Is there a way for using DataAnnotations instead while keeping validation in service layer like the above?

]]>Comment Posted by memehttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csFri, 13 Aug 2010 01:35:44 GMT00000000-0000-0000-000000009844Stephen,

Thanks for this, it is informative and clear. Very useful for my purposes.

However, either I don't fully understand this approach, or it seems flawed.

The problem I have is that following this approach can seemingly lead to Exceptions from the EF entity itself when MVC attempts to bind posted values to the properties of the EF entity.

i.e. ConstraintException from the EntityObject derived class (e.g. from null values) before code execution has even got inside the Post Action (e.g. your ProductControllers Create) block.

[AcceptVerbs(HttpVerbs.Post)]

public ActionResult Create([Bind(Exclude = "Id")] Product productToCreate)

{

So am looking into what to do in these cases, obviously can't rely on JScript alone to avoid these exceptions, and do not want to change to more weak typing for the Post Action parameters (and then have to do the form values to typed Model mapping by hand), so not sure what to do really.

Any ideas, or have I missed something in the post itself?

Seems like a pretty big problem for this approach unless there is a decent solution.

Is this because you were using "code first" and so have simpler entities without such "validation" functionality built in?

(I am going schema first atm, and have not really used code first).

Many Thanks

]]>Comment Posted by jonjenkinshttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csTue, 14 Sep 2010 01:46:53 GMT00000000-0000-0000-0000000010220This works well, but how does it handle validating IEnumerable collections in the post method? I tried it and noticed that it failed to display the ModelState error on the view since the field name in a collection contains the [index] prefix, but the service layer simply validates on the plain field name with no index associated. Any tips?

]]>Comment Posted by vherzhttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csThu, 16 Sep 2010 12:42:19 GMT00000000-0000-0000-0000000010265"_validatonDictionary" seems to be a typo.

]]>Comment Posted by nicequyhttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csSat, 29 Jan 2011 13:14:06 GMT00000000-0000-0000-0000000011838forums.asp.net/

]]>Comment Posted by mhfausthttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csSun, 10 Apr 2011 06:59:23 GMT00000000-0000-0000-0000000012747There are collections of products (<product>) and numerous members and arguments typed as "product", but no "product" class is defined anywhere. Where would this be, what would it look like??

]]>Comment Posted by BatsIhorhttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csMon, 11 Apr 2011 07:50:40 GMT00000000-0000-0000-0000000012757I may be wrong but, if you move repository logic to the service layer why did you leave at the controller repository creation? I think it will be better if controller will know only about service and it will work only with service. service will know only about repository and work with it.. It will be according to the SOLID!

]]>Comment Posted by frankhoffyhttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csMon, 09 May 2011 12:35:30 GMT00000000-0000-0000-0000000013110The main drawback I see with this approach is that client-side validation is no longer possible, because validation always happens on the submit.

It also means that as the customer fixes the data in the offending fields, they will still show up in red until they re-submit. This also holds true for the WPF world.

I'd like to see how this model is implemented in the WPF world as well. I guess you have to maintain your own error collection and implement IDataErrorInfo.

]]>Comment Posted by ryanw51http://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csThu, 25 Aug 2011 13:25:07 GMT00000000-0000-0000-0000000014055Excellent post. This was a major help in cleaning complex validation out of my controllers. Now, it's all tucked away in the service layer just like it should be.

]]>Comment Posted by prasanth.nethttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csWed, 14 Sep 2011 05:49:51 GMT00000000-0000-0000-0000000014188Good article

]]>Comment Posted by starforcehttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csFri, 23 Sep 2011 15:34:14 GMT00000000-0000-0000-0000000014253Was half helpful but would have been better if there was a demonstration of the Product Class. I am assuming that the Product class would be located in the Modeler and would represent the View

]]>Comment Posted by koistyahttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csTue, 19 Jun 2012 14:42:40 GMT00000000-0000-0000-0000000015804Good article. Thanks. Though don't like how this service class passes validation errors back to the controller with IValidationDictionary. I would make it work more like this:

<a rel="nofollow" target="_new" href="https://gist.github.com/2955801" target="_blank">https://gist.github.com/2955801</a>

]]>Comment Posted by koistyahttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csTue, 19 Jun 2012 16:32:50 GMT00000000-0000-0000-0000000015805<a rel="nofollow" target="_new" href="https://gist.github.com/2956368" target="_blank">https://gist.github.com/2956368</a>

]]>Comment Posted by jselesanhttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csMon, 25 Jun 2012 15:35:02 GMT00000000-0000-0000-0000000015846Very usefull post, but I have a problem. I'm trying to use an IoC framework to inject the business services ojects into my controllers. The problem is that I cannot refer to ModelState to configure my IoC container (Castle Windsor). Did you think on this scenario?

]]>Comment Posted by alireza6282http://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csTue, 25 Dec 2012 10:47:32 GMT00000000-0000-0000-0000000017063hi, this is good idea for DI pattern and ...

only one problem,

why we can render validation on client same annotation attributes in MVC 4?

]]>Comment Posted by desmond80inhttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csMon, 21 Jan 2013 20:54:53 GMT00000000-0000-0000-0000000018222Thank you very much for the article. This was very informative. In my current MVC application I have not implemented the validation part of the service and the first thing I'm going to do it to implement that.

]]>Comment Posted by koistyahttp://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-csMon, 06 May 2013 17:07:18 GMT00000000-0000-0000-0000000019048Stephen, how would you make this work with a dependency injection? ...when this.ModelState of the Controller is unknown yet when service class is constructed

Working on implementing a similar architecture here:

<a rel="nofollow" target="_new" href="https://github.com/kriasoft/site-sdk" target="_blank">https://github.com/kriasoft/site-sdk</a>

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