Question

Can I add a SQL function to my .edmx file like I do in .dbml? If I can, how to do that? If I can not, is there any workaround?

I tried to Google but can’t find any concrete answer about how to do that.

Based on the given answer I have created a Stored procedure and tried to add a ‘import function’, but it says ‘the stored procedure returns no column’ . Where am I doing wrong?
The function:

ALTER FUNCTION [dbo].[fn_locationSearch](@keyword varchar(10))
RETURNS TABLE
AS
RETURN
(
SELECT CustomerBranch.ID,CustomerBranch.BranchName,CustomerBranch.Longitude,CustomerBranch.Latitue,CustomerBranch.Telephone,CustomerBranch.CategoryID,CustomerBranch.Description

FROM FREETEXTTABLE (CustomerOffer,*,@keyword) abc INNER JOIN OffersInBranch
ON abc.[key]=OffersInBranch.OfferID INNER JOIN CustomerBranch ON     OffersInBranch.BranchID=CustomerBranch.ID
UNION
SELECT    CustomerBranch.ID,CustomerBranch.BranchName,CustomerBranch.Longitude,CustomerBranch.Latitude,CustomerBranch.Telephone,CustomerBranch.CategoryID,CustomerBranch.Description
FROM CustomerBranch WHERE FREETEXT(*,@keyword)
)

The Stored procedure:

ALTER PROCEDURE USP_locationSearch
(@keyword varchar(10))
AS
BEGIN
SELECT * from dbo.fn_locationSearch(@keyword)
END

Answer 1

There is no built in support for SQL User Defined Functions in Entity Framework, your best approach would be to create a stored procedure which wraps the function call and returns its output, then add that procedure to your EF model.