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Asked: 2026-05-10T18:30:05+00:00

Considering the following architecture: a base object ‘Entity’ a derived object ‘Entry:Base’ and a

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Considering the following architecture:

  • a base object ‘Entity’
  • a derived object ‘Entry:Base’
  • and a further derived object ‘CancelledEntry:Entry’

In EntitySQL I can write the following: 

[...] where it is of (only MyEntities.Entry) [...]

to return only objects of type Entry and no Entity or CancelledEntry.

In linq to sql, the following command will return objects of type Entry and CancelledEntry. 

EntityContext.EntitySet.OfType<Entry>()

What is the syntax/function to use to return only objects of type Entry?

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1 Answer

  1. Why don’t you apply an extension method on IQueryable< Entry > called ApplyBaseEntryFilter() which would apply this filter and return an IQueryable< Entry >.

    This is an example of how to reuse linq query fragments. Using extension methods on IQueryable< Entity > is a great way to re-use queries as you should neve rneed to copy and paste query fragments around your application, hope that helps.

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