Make zero appear last in a sorted list of integers

Question

I have a list of objects and want to order them by some property

List<Foo> foo = GetList();    
return foo.OrderBy(foo => foo.DisplayOrder);

The catch is that when DisplayOrder is zero I need to place that item in last position.

My question is the same as make zero appear last in a list of ascending numbers but in C#. It's easy to solve but I want to see some creative, concise answers.

Answer 1

You can use the fact that you can order by a boolean value. If you first order by DisplayOrder == 0 this will results to true for all zero values and false for all other values. Since true will ordered after false all zero values will be at the very end:

return foo.OrderBy(x => x.DisplayOrder == 0)
          .ThenBy(x => x.DisplayOrder);

Answer 2

How about

return foo.OrderBy(foo => foo.DisplayOrder == 0 ? int32.MaxValue : foo.DisplayOrder);