Question

I’ve got a table called IssueStatuses and another table called Issues. Issues has a StatusID and SubStatusID, both of which are from the IssueStatuses table which has an additional field that states if it’s a SubStatus or not, like so:

IssueStatuses

• IssueStatusID
• IssueStatus
• IsSubStatus

I’m trying to get a list of SubStatuses for a particular list of Issues. In SQL it’s:

SELECT iss.IssueStatus, COUNT(iss.IssueStatus) AS Total
FROM Issues AS Issues 
INNER JOIN Rooms r ON Issues.RoomID = r.RoomID 
INNER JOIN Locations l ON l.LocationID = r.LocationID 
INNER JOIN Customers c ON l.CustomerID = c.CustomerID 
INNER JOIN (SELECT * FROM IssueStatuses WHERE IsSubStatus = 0) ist ON Issues.IssueStatusID = ist.IssueStatusID 
INNER JOIN (SELECT * FROM IssueStatuses WHERE IsSubStatus = 1) iss ON Issues.IssueSubStatusID = iss.IssueStatusID 
WHERE c.Customer = 'ABC' 
AND l.Location = 'MySite'
GROUP BY iss.IssueStatus

but I”m having trouble converting it to LINQ. The desired output would be something like:

IssueStatus | Total
-------------------
Open          15
Delayed       25
On Time       8 

Here’s what I’ve tried with LINQ:

var query = from i in Issues
join r in Rooms on i.RoomID equals r.RoomID
join l in Locations on r.RoomID equals l.LocationID
join c in Customers on l.CustomerID equals c.CustomerID
where i.IssueStatusID == (from ist in IssueStatuses
                            where ist.IsSubStatus == false
                            select ist)
&& i.IssueSubStatusID == (from iss in IssueStatuses
                            where iss.IsSubStatus == true
                            select iss)
&& c.Custome == "ABC"
&& l.Location == "MySite"
    group i by i.IssueStatus

but I know it’s wrong because LINQPad throws an error stating:

can't convert int to type Models.IssueStatus

What I need to do is use iss.IssueStaus to group on but I can’t access it. Can someone tell me what I’m doing wrong?

Answer 1

How about this (untested but I should be close):

var query = from i in Issues
            join r in Rooms on i.RoomID equals r.RoomID
            join l in Locations on r.LocationID equals l.LocationID
            join c in Customers on l.CustomerID equals c.CustomerID
            join ist in IssueStatuses on i.IssueStatusID equals ist.IssueStatusID
            join iss in IssueStatuses on i.IssueSubStatusID equals iss.IssueStatusID
            where !ist.IsSubStatus && iss.IsSubStatus
                && c.Customer == "ABC"
                && l.Location == "MySite"
            group i by iss.IssueStatus into g
            select new {IssueStatus = g.Key, Total = g.Count()}