Question

How would the following sql statement translate to a linq query?

select ID,         Price,         dbo.fGetText(DescriptionID, defaultLanguage, currentUserLanguage)  from Products 

The UDF fGetText is quite substantial and used throughout the code base, so it needs to be encapsulated (as a UDF or otherwise, perhaps a Linq Expression).

Extra round trips to the database server are not a option. There should only be one query, retrieving 3 fields.

Many thanks in advance for your help. It is greatly appreciated.

Answer 1

Here is the MSDN article:

How to: Call User-Defined Functions Inline (LINQ to SQL)

A note from the same page:

Although you can call user-defined functions inline, functions that are included in a query whose execution is deferred are not executed until the query is executed. For more information, see Introduction to LINQ Queries.

When you call the same function outside a query, LINQ to SQL creates a simple query from the method call expression

Also, take a look at this 13 min screencast.