Re: [dotNetRDF-develop] dotNetRDF and Linq

[Rob V. <rv...@vd...>]

Hi Michael

When I said dotNetRDF works with Linq I meant it is designed so you can use it with Microsoft's System.Linq namespace.

LinqToRdf is a now inactive project (afaik) developed by the guy who now runs Semantic Overflow which was a Linq style wrapper around the also inactive SemWeb library which mapped from Linq methods into SPARQL queries.

So when I say dotNetRDF supports Linq what I'm talking about is the fact that many objects and methods are defined as IEnumerable<T> which means that all of Microsoft's Linq methods for IEnumerable<T> can be used.

For example you can do something like the following:

Graph g = new Graph();

//Get some data from somewhere...

//Use the Linq OrderBy() method to order Triples by predicate
foreach (Triple t in g.Triples.OrderBy(item => item.Predicate))
{
  //Do something with each Triple
} 

Or equally you can use the natural language style syntax to do things:

//Use Linq natural language syntax with a where clause to select Triples with a Blank Node subject
IEnumerable<Triple> ts = from t in g.Triples where t.Subject.NodeType == NodeType.Blank select t; 

So basically any of the methods defined by the Enumerable class in the System.Linq namespace can be used against many of the objects and their methods from the dotNetRDF library - http://msdn.microsoft.com/en-us/library/bb345746%28v=VS.100%29.aspx

Hope this helped explain things a little, if you want more information/examples please let me know.

Regards,

Rob Vesse

----------------------------------------
From: Michael Friis <fr...@gm...>
Sent: 09 June 2010 21:55
To: rv...@vd...
Subject: dotNetRDF and Linq 

Hi Rob, you mention in this answer that dotNetRDF works with Linq:
http://www.semanticoverflow.com/questions/448/what-are-microsofts-offerings-in-the-semantic-world/458#458

Could you describe this in more detail? I'm looking at LinqtoRDF, but
it seems kinda old and kinda broke...
Michael

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