If condition in LINQ Where clause

Question

Can I use if clause with Linq where?

Answer 1

Not sure if this is appropriate but it is quite useful, you can use ifs quite handily with conditional where clauses:

 var r = (from p in productinfo.tblproduct
                     where p.Accountid == accountid
                     select p);

            if (uuf1 != null)
                r = r.Where(p => p.UnitUserField1 == uuf1);

            if (uuf2!= null)
                r = r.Where(p => p.UnitUserField2 == uuf2);

So the where clause will be amended according to what is in UUF1 or UUF2 i.e. you might have only UUF1 with info, in which case it will take that and ignore the UUF2 where clause, you might have both in which it will take both or you might not have anything in UUF1 or 2 and your where clause will just take the accountid as the where clause.

Answer 2

I'm not sure what the question is, but a possible answer could be:

Yes,

list.Where(item => { if (Foo(item)) return true; else return false; });

It would be a complicated way of saying something simple, though.