Calling a SQL User-defined function in a LINQ query

Question

I am having a hard time getting this to work. I am trying to do a radius search using the following Filter helper on an IQueryable. There are a set of other filters that get

Answer 1

if you use Code-First approach, then you cannot call UDFs as you want (as of EF6) - here is the proof, and another one. You are only limited to calling UDF as a part of your SQL query:

bool result = FooContext.CreateQuery(
    "SELECT VALUE FooModel.Store.UserDefinedFunction(@someParameter) FROM {1}",
    new ObjectParameter("someParameter", someParameter)
).First();

which is ugly IMO and error-prone.

Also - this MSDN page says:

The process for calling a custom function requires three basic steps:

1. Define a function in your conceptual model or declare a function in your storage model.

which essentially means you need to use Model-First approach to call UDFs.