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POSQL to Linq equivalent
 

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    <p>I've got this stored procedure I'd like to convert to LINQ to SQL, but I'm having a bit of trouble because I'm new to LINQ (and actually, I'm no SQL guru) and I am not getting the expected results. (I tried calling the SPROC from LINQ to SQL but when I send in the Period datetime as parameter on the SPROC I get some error on L2S about the parameter being nullable but I sent it also non-nullable and I still get the same error.) Below is the SQL:</p> <pre><code>SELECT Persons.IDPerson,Persons.Name,Persons.PaternalName,Departments.DepartmentName,Jobs.Title, Persons.HireDate, Terminations.TerminationDate, Terminations.HireDate FROM Persons left outer join Terminations on Persons.IDPerson = Terminations.IDPerson left outer join Departments on Departments.idDepartment = Persons.IdDepartment left outer join Jobs on Jobs.IDJob = Persons.IDJob WHERE (Terminations.IDTermination is null OR Terminations.TerminationDate &gt;= @Period) and Terminations.HireDate &lt;= @Period OR Persons.HireDate &lt;=@Period ORDER BY Persons.HireDate, Terminations.HireDate asc </code></pre> <p>This is my LINQ code so far (it does compile but it doesn't give me the records I expect) The Criteria.Period is a nullable datetime:</p> <pre><code> result = from emp in HRSystemDB.Persons.OfType&lt;Employee&gt;() join term in HRSystemDB.Terminations on emp.IDPerson equals term.IDPerson into all from aHire in all.Where(t =&gt; (t.IDTermination == null || t.TerminationDate.Date &gt;= Criteria.Period.Value.Date) &amp;&amp; t.HireDate.Value.Date &lt;= Criteria.Period.Value.Date || emp.HireDate.Date &lt;= Criteria.Period.Value.Date).DefaultIfEmpty() select new DepartmentHeadCountQuery { FullName = emp.Name + " " + emp.PaternalName, Department = emp.Department.DepartmentName, JobTitle = emp.Job.Title, TermDate = aHire.TerminationDate, EHiredDate = emp.HireDate, TermHireDate = aHire.TerminationDate }; </code></pre> <p>Thanks in advance.</p>
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