How to call an arbitrary method on each element of a set in linq style?

Question

.NET

The help of the person who is well familiar with linq is necessary. I have:

IEnumerable<Sometype1> clist = GetC();
// ...
// каждый элемент clist содержит множество slist
// ...
IEnumerable<Sometype2> slist = с.GetS();

It is necessary to go through all the s elements of each slist 'a of all clist 's, and on each s execute a method with the signature void T(Sometype1 c, Sometype2 s). . This is the first highlight.
However, and this is the highlight #2, before reading the slist with c.GetS(), you need to call the method with the signature void A(Sometype1 c, string pass).
Right now I'm doing this:

var querry = GetC().SelectMany(
   c => { A(c, pass); return c.GetS(); },
   (el_c, s) => { T(el_c,s); return s; });

But it is not aesthetically pleasing and not transparent. In addition, all other queries in the code block are done in the manner of linq, and this fragment stands out as an eyesore.
I can't figure out how to syntactically build the query. I want to write something like

var querry = from c in GetC()
                from s in /*перед этим вызовом должен быть А(c, pass)*/ c.GetS() 
                /*и где-то тут нужно как-то вызвать T(c,s)*/
                select s;

Answer 1

Call the c void method as a return value:
PS As for aesthetics, the problem is in the naming of variables and methods. If you call it normal, it will be read well and understandably.