Oren Eini

aka Ayende Rahien

Oren Eini

CEO of RavenDB

a NoSQL Open Source Document Database

Get in touch with me:

oren@ravendb.net +972 52-548-6969

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RavenDB Workshops - Deep dive into practical use of Document Data Modeling
  previous post next post  
May 06 2009

Some linq love

time to read 1 min | 25 words

Well, because of things like this:

var entityModels = model
	.Sessions
	.First()
	.Views
	.OfType<SessionEntities>()
	.Single()
	.EntityModels;

I feel like I am working with XPath or CSS selectors :-)

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Comments

Bertrand Le Roy
06 May 2009
17:59 PM
Bertrand Le Roy

mmh. You're saying that like it's a good thing ;)

Rafal
06 May 2009
19:06 PM
Rafal

Is this love, baby, or is it, uh-huh, Just, uh, confusion?

Where's linq?

Louis DeJardin
06 May 2009
19:09 PM
Louis DeJardin

That's all Linq - the pseudo-sql is syntactic sugar. (tongue twister)

Looks like a good thing - type safe, self-asserting expectations, terse, and readable. Or was this an example of trying to do too much at once? Seems the comparison to XPath or CSS could be taken either way...

Duckie
06 May 2009
19:22 PM
Duckie

It must be a test, to see if we actually read what he blogs.

7 lines of sin ihmo.

Stephen
06 May 2009
20:03 PM
Stephen

@blatent-villagers-with-forks-and-firey-sticks

I'm not using linq, and infact I'm telling everyone it sucks because its black magic, how dare something come along and blow away the crap I've spent years trying to bring to life fruitlessly..

Oh wait sorry I'm not at all bitter about new technologies.

configurator
06 May 2009
21:39 PM
configurator

This isn't Linq. Linq - language integrated query - is the integration of the query syntax into the language. I.e. Linq is not a series of methods (even extension methods) but the actual syntax difference.

That said, I don't like this code because the first thought was 'Hmm, what does it do?' - and the second thought was the same.

Louis DeJardin
06 May 2009
22:26 PM
Louis DeJardin

@configurator I think I'll need to respectfully disagree... While the native language syntax is one aspect of LINQ, the term itself applies to the overall capability.

msdn.microsoft.com/.../aa904594.aspx

"LINQ is a set of extensions to the .NET Framework that encompass language-integrated query, set, and transform operations. It extends C# and Visual Basic with native language syntax for queries and provides class libraries to take advantage of these capabilities."

en.wikipedia.org/wiki/Language_Integrated_Query

"Query syntax: Languages are free to choose a query syntax, which it will recognize natively. These language keywords must be translated by the compiler to appropriate LINQ method calls."

Mike Minutillo
07 May 2009
02:04 AM
Mike Minutillo

I do this sort of thing all of the time but I always feel the ghost of Demeter staring holes in my back when I do. It's also a PITA to debug so most projects I use this sort of thing on end up with a

public static T Expose <t(this T target, Action <t action)

{

action(target);

return target;

}

That way you can

var entityModels = model

.Sessions

.First()

    .Expose( s => { /* log s or breakpoint here or something */ })

.Views

.OfType

<sessionentities()

.Single()

.EntityModels;

It's messy and not something I recommend

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