Select SQL case when for Entity Framework - entity-framework

Question

I have this select which works in T-SQL, but need to convert to Entity Framework. How can I use case in Entity Framework?
select
*
from
Contrato c
where
c.QtdParcelasFalta > 0
and (case
when c.DiaEspecificoMarcar = 1
then c.DiaEspecifico
when c.DiaEspecificoMarcar = 0
then (select convert(int, substring(DataCobranca, 2, 2))
from Contrato
where Contrato.Id = c.Id) -
(select e.DataProcessamentoNota
from Contrato t
inner join PedidoVenda p on p.id = t.PedidoVendaId
inner join Empresas e on p.EmpresaID = e.Id
where p.id = t.PedidoVendaId
and t.id = c.Id and p.EmpresaID = 1)
end) = (SELECT DAY(GETDATE()))
I tried it like this, but it didn't work out, did not pass the correct values, because I'm not aware of pass to Entity Framework:
var contrato = db.Contrato
.Include(a => a.PedidoVenda)
.Include(a => a.Cliente)
.Where(a => a.PedidoVenda.EmpresaID == model.EmpresaID
&& a.Cancelado == false
&& a.DiaEspecificoMarcar == true
&& a.DiaEspecifico == int.Parse(DateTime.Now.ToString("dd")) ||
(int.Parse(a.DataCobranca.Substring(1, 2)) - a.PedidoVenda.Empresa.DataProcessamentoNota)
== int.Parse(DateTime.Now.ToString("dd"))
).ToList();

Answer 1

You are actually on the right track. You just need to add when conditions to your lef and right conditions like this:
var contrato = db.Contrato.Include(a => a.PedidoVenda).Include(a => a.Cliente).Where
(a => a.PedidoVenda.EmpresaID == model.EmpresaID && a.Cancelado == false &&
a.DiaEspecificoMarcar == false && a.DiaEspecifico == int.Parse(DateTime.Now.ToString("dd")) ||
( a.DiaEspecificoMarcar == true && int.Parse(a.DataCobranca.Substring(1, 2)) - a.PedidoVenda.Empresa.DataProcessamentoNota)
== int.Parse(DateTime.Now.ToString("dd"))
).ToList();
I also suggest you use DateTime.Now from a variable to be sure both int.Parse gets the same input