i want to query an Ontology which is defined in an RDF file using SPARQL and dotnetRDF library. The problem is that the file is large, so it's not very practical to load the entire file in memory. What should i do ? Thanks in advance
As AKSW says in the comment, the best approach would be to load your RDF file into a triple store and then run your SPARQL queries against that. dotNetRDF ships with support for several triple stores as listed at https://github.com/dotnetrdf/dotnetrdf/wiki/UserGuide-Storage-Providers. However, all you really need is a triple store that supports the SPARQL protocol and then you will be able to run your queries from dotNetRDF code using the SparqlRemoteEndpointclass as described at https://github.com/dotnetrdf/dotnetrdf/wiki/UserGuide-Querying-With-SPARQL#remote-query.
As for which triple store to use, Jena with Fuseki is probably a good open-source choice.