Linq Lambda expression for below sql in vb.net

Question

I have this existing Sql statement:

Select Count(ordid),isnull(prcsts,'NOT STARTED')
from lwp
where lwp in( Select max(Id) from lwp group by ordid)
group by prcsts

I want to convert to use linq-to-sql, but I'm can't figure out how to handle the group by expression in the sub query. How can I do this?

I am using Entity Framework where I have a method to get the list of lwp. I did only part of it.

Entitydb.lwpmethod
        .GetList
        .Where(Function(F) F.ID = **Max(Function(O)  O.ordid**)
        .GroupBy(Function(F) F.prcsts)
        .Select(Function(F) New With {.A = F.Count, .B = F.Key})
        .ToList

I am unable to write the group by subquery in the max function.

Answer 1

First off, that's not an in, that's an = since max() returns a single element. Also your sql query has lwp in the where clause, you probably typo'd id. With that in mind, what you want is something like:

.Where(row=>row.ID=Entitydb.lwpmethod.GetList()
                                     .Where(r=>r.ordid=row.ordid)
                                     .Max(r=>r.ID))

C# code, but you get the idea.

By the way this looks like it's selecting the last row. Why not just sort by id descendently and take the first element?