Can I use a TryParse inside Linq Comparable?

Question

A sort of:

Documenti = Documenti
    .OrderBy(o => string.IsNullOrEmpty(o.Note))
    .ThenBy(o => Int32.TryParse(o.Note))
    .ToList();

Answer 1

C# 7 has some new features that make this even easier

var ints = from a in str.Split(',').Select(s=> new { valid = int.TryParse(s, out int i), result = i })
           where  a.valid
           select a.result;

or as you are asking specifically about sorting

var ints = from a in str.Split(',')
           orderby (int.TryParse(s, out int i) ? i : 0 )
           select a.result;