[IronPython] About IronPython and LINQ again

[Keith J. Farmer]

As Dino mentions, nothing prevents you from calling the static extensions directly:  they exist in the System.Linq namespace of System.Core.dll.  The problem, of course, is that you end up with a lot of
 
   Queryable.Select(Queryable.Where(someInputSequence, somePredicate), someFuncThatReturnsTheSequenceElement)
 
instead of the more pleasant
 
   someInputSequence.Where(somePredicate).Select(someFuncThatReturnsTheSequenceElement)
 
or even
 
   from x in someInputSequence
   where somePredicate(x)
   select someFuncThatReturnsTheSequenceElement(x)
 
And that's without getting deeply into the type naming, or expression building with parameters.  However, it's still entirely doable -- it's just *MUCH* easier when the language is helping out with extension methods, expressions trees from lambdas, and sophisticated type inference capabilities.
 
As for ASP.NET itself, Scott Guthrie (in his blog) has already mentioned the impending LinqDataSource control, which will do some of the more interesting stuff for you.  You'll probably be able to have a working solution off of that alone, I think (I haven't had the opportunity to play around with it, though I took a stab at writing one, which exists in the May CTP samples).  Then, when IronPython gets additional features enabled I imagine you'll have some more flexibility available.

________________________________

From: users-bounces at lists.ironpython.com on behalf of Kevin Chu
Sent: Thu 4/26/2007 7:13 PM
To: Discussion of IronPython
Subject: Re: [IronPython] About IronPython and LINQ again


If I plan to create Web Framework base of IronPython for ASP.NET like Django.
First thing,I have to solve is a ORMapper.
So do you any adivces about ORMapper used in IronPython for ASP.NET?

 
On 4/27/07, Keith J. Farmer <kfarmer at thuban.org> wrote: 

	Well, get to it! ;)
	
	-- Keith [MSFT: LINQ to SQL]
	
	________________________________
	
	From: users-bounces at lists.ironpython.com on behalf of Dino Viehland
	Sent: Thu 4/26/2007 11:10 AM
	To: Discussion of IronPython
	Subject: Re: [IronPython] About IronPython and LINQ again 
	
	
	
	There's still no direct LINQ support.  We believe we're getting the correct architecture in place to support extension methods in v2.0 (note though we still haven't done the actual work to enable the extension methods and when we ship the first 2.0 builds there will be no dependencies on Orcas).  This will enable much of the LINQ abilities in a convenient to use syntax.  Until then you can clr.AddReference to the LINQ libraries and call the static extension methods directly but it'll be ugly. 
	
	
	
	Other than that we still haven't gotten to figuring out how to support LINQ in a more direct form.
	
	
	
	From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Kevin Chu
	Sent: Thursday, April 26, 2007 5:02 AM
	To: Discussion of IronPython
	Subject: [IronPython] About IronPython and LINQ again 
	
	
	
	Hi, IronPythoners
	
	
	
	In May 10, 2006 ,I post a discussion about IronPython and LINQ, complete discussion url is : http://lists.ironpython.com/pipermail/users-ironpython.com/2006-May/002300.html <http://lists.ironpython.com/pipermail/users-ironpython.com/2006-May/002300.html> 
	
	
	And now Orcas Beta 1 is released, I again inquire about can I use LINQ in IronPython.
	
	Because ,IronPython now only use ado.net to access database, if we can use LINQtoSQL to access SQL Server. It's cool!
	
	
	--
	Once in a Redmoon
	
	_______________________________________________
	users mailing list 
	users at lists.ironpython.com
	http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
	




-- 
Once in a Redmoon