Type Inference failed in a call to 'join' on nullable and non-nullable int

Question

In my Linq, I am trying to make an inner join to a nullable field. Employee and Department have a relation, Department may have an EmployeeID or may have a null. So what wou

Answer 1

I had the same issue, where my charge_codes.CompanyId was nullable but my order_items.CompanyId was NOT nullable.

So I had to get my charge codes into their own ananomous type and make it not be nullable.

var chargeCodes = from s in db.Charge_Codes
where s.CompanyID != null
select new { CompanyID = (int)s.CompanyID, 
             Charge_CodeID = s.Charge_CodeID, 
             Revenue_Code_Id = (int)s.Revenue_CodeID, };



//now my chargeCodes contains an anonymous with a non nullable CompanyID and 
//a non nullable Revenue_CodeID 

//use chargeCodes here
var query = from oi in db.Order_Items
join cc in chargeCodes on 
new {oi.CompanyID, oi.Charge_CodeID} equals new {cc.CompanyID, cc.Charge_CodeID}