If you've been following my blog, you should know that I am keeping a pretty close watch on ADO.NET Data Services. The team recently released a second CTP of the new version with some interesting features. This CTP has some pretty compelling additions, but I am going ot focus on one in particular.
I've been teaching and using ADO.NET Data Services for a long time and I like showing off exposing a LINQ-based provider (Entity Framework, NHibernate or others) to a Silverlight application. While ADO.NET Data Services does expose its API through a REST API, the magic for me is in its use in Silverlight. In case you haven't been following along, using the Silverlight client you can issue a LINQ query through the Silverlight client (though in fairness, the full power of LINQ is not supported in the client):
Pardon the link post, but this is a great short walk-through of using LinqPad to execute EF queries against your own model. Great for testing query ideas against your data. Highly recommended.
UPDATE: Roger Jennings correctly stated, I meant to say that Include is *not* a guarantee.
It seems that because of some internal NHibernate changes that are required to make NHibernate LINQ work really well, the current version of NHibernate LINQ will not be supported. Evidently there are a number of complex queries that do not work correctly under the current codebase. Its been announced that these changes will be made in the NHibernate 2.1 (which is in development). Follow the link to read the full details!
I've spent much of the last couple of weeks trying to strengthen my LINQ knowledge. A friend of mine is one of the authors of a LINQ book so I figured it was a good match to dig deeper.
Next Monday night (July 28th, 2008), i'll be giving the short Q&A session at the Atlanta .NET Users Group. The topic? NHibernate's LINQ and ADO.NET Data Services support. If you're interested in using NHibernate but don't want to give up your LINQ skills, stop by for a listen!
Now that my ADO.NET Data Services support has been merged into the trunk of NHibernate.LINQ, I do have some caveats about using NHibernate.LINQ with ADO.NET Data Services. ADO.NET Data Services is a beta 1 product so there are some bugs and issues that you will either need to avoid or work around.
In response to some requests that I have received, I decided to write a several part blog on some of the techniques I used in developing Wildermuth.com. In this first example, I am going to discuss the use of LINQ and data in my site.
In moving from www.adoguy.com to www.wildermuth.com, one of my goals was to use LINQ as much as possible to see the travails of using it on a real project. I have done a lot of small samples with LINQ but did it hold up for real work? Suffice to say I am pretty impressed (though whether a blog is 'real work' is up for discussion, but its a better exercise of the technology than my samples had been).
Most of my exposure to LINQ has been in very short snippets and sessions at various conferences and blogs. My initial reaction was fairly negative. This negative reaction was based on several key factors:
Let me discuss these points individually. I think that LINQ for SQL is not a compelling ORM (and is mostly useful only in the RAD or prototyping of applications, much like Typed DataSets are now). The more problematic part of this factor is that it only confuses developers as LINQ is not about database development but about integrating query into code. Integrating a query mechanism into the language is a great feature that should be explained but using LINQ for SQL as a demonstration tends to lend the comparison with nHibernate, LLBGenPro, Typed DataSets and such. The reality is that LINQ for SQL is an interesting implementation of LINQ but clouds the issue.
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|Application Name||WilderBlog||Environment Name||Production|
|Application Ver||v4.0.30319||Runtime Framework||x86|
|App Path||D:\home\site\wwwroot\||Runtime Version||.NET Core 4.6.27817.01|
|Operating System||Microsoft Windows 10.0.14393||Runtime Arch||X86|