Question

I saw this post Linq int to string, and tried it

            var personalInfoQuery = from t in crnnsupContext.Tombstones
                                    join i in crnnsupContext.InitialEducations on t.InitialEducation equals SqlFunctions.StringConvert((double)i.InitalEducationID) 
                                    where t.RegNumber == 25952
                                    select new CPersonalInfo 
                                    { 
                                       Tombstone = t, 
                                       InitialEducation = i
                                    };

in the database t.InitialEducation is char, i.InitalEducationID is int, but the retrieved result is null. I am pretty sure the value is not empty in the SQL server. So I think the problem is SqlFunctions.StringConvert((double)i.InitalEducationID)

when i remove the join statement, it got this person’s information.

Does anyone know why. thanks

Answer 1

Finally find the reason!!
t.InitialEducation is nvarchar(1) in the database, i.InitalEducationID is int, after I modified to SqlFunctions.StringConvert((double)i.InitialEducationID, 1) it works!

“1” is the length of the returned string, the default length is 10, I guess there are some extra space.