Linq - Limit number of results by same value of a field - entity-framework

Question

I have a problem with a creation of a Linq to Entities (Oracle 11g) request. Here is the
I have a table TREATMENT with three column (simplified version) : ID, STATE and APPLICATION. Here is a sample :
ID STATE APPLICATION
1 A MAJ
2 A FLUX
3 A FLUX
4 R REF
5 A REF
Now, my objectives are to retrieve the data with theses rules:
State must be A (added)
Number of rows per application below a max value
The max value is minored b the number of row with State = R (per application)
Exemple : If the max value is 1, I must retrieve row 1 and 2. (Can't retrieve row 5 since there is already a REF with state R (the row 4))
I manage to retrieve all the row when the number of R is equal or greater than the max value, but I don't see how to limit my number of result in order to respect the max value.
Here is the request :
using (Entities bdd = new Entities())
{
var treatments = from trt in bdd.TREATMENT
let app = from t in bdd.TREATMENT
where t.STATE == "R"
group t by t.APPLICATION into grouped
where grouped.Count() >= maxPerApplication
select grouped.Key
where trt.STATE == "A" && !app.Contains(trt.APPLICATION)
orderby trt.ID
select new TreatmentDto()
{
Id = trt.ID
};
result = treatments.ToList();
}
In SQL, I would use an inner request and a ROWNUM to limit the number of result, but I don't see how to do it. The only solution I see is to do the request in two parts, but I want to avoid this to maintain the consistency of the information.

Answer 1

I found a solution, not sure if it's the best, but it works :
using (Entities bdd = new Entities())
{
from trt in bdd.TREATMENT
where trt.STATE == "A" &&
(from trt2 in bdd.TREATMENT
where trt2.STATE == "A" && trt2.APPLICATION == trt.APPLICATION && trt2.ID <= trt.ID
select trt2).Count() <= maxPerApplication - (from appp in bdd.TREATMENT
where appp.STATE == "R"
&& appp.APPLICATION.Equals(trt.APPLICATION)
select appp).Count()
select new TreatmentDto()
{
Id = trt.ID
};
result = treatments.ToList();
}