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Is it possible to use a function import in a where clause in entity framework? I have tried the following, but I get a rather cryptic exception to which I cannot find any information about:
var q = MyContext.MyEntities.Where("MyContext.MyFunction(it.ID)")
(The function is set to return a Boolean)
System.Data.EntitySqlException: ‘MyContext.MyFunction’ cannot be resolved into a valid type constructor or function., near WHERE predicate, line 6, column 21..
Regards
Lee
The query you are trying to write is composing a call to a FunctionImport with a query over an EntitySet.
But because FunctionImports are wrappers around StoredProcedures, which are non-composable, this just won’t work.
In order for something like this to work, theoretically the function would need to be a wrapper around something composable like a TVF (Table Value Function). But unfortunately TVFs aren’t supported in the Entity Framework today.
Alex