Conditional “orderby” sort order in LINQ

Question

In LINQ, is it possible to have conditional orderby sort order (ascending vs. descending).

Something like this (not valid code):

bool flag;

(from w          


        

Answer 1

If the ordering property Id is a number (or supports the unary minus) one could also do:

bool ascending = ...

collection.Where(x => ...)
  .OrderBy(x => ascending ? x.Id : -x.Id)
  .Select(x => ...)

// LINQ query
from x in ...
orderby (ascending ? x.Id : -x.Id)
select ...