C# Sort Array by multiple different conditions

Question

I got an array which contains items of the object 'Person'

I need to have the special people on top (those sorted by Id) and the nonspecial people below (those sorted alphabetically). It should look like this:

Is there a way of sorting it like this without having to split the list, sort it individually and then merging it back together?

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– Igor, Commented Mar 16, 2022 at 12:30

Dmitrii Bychenko · Accepted Answer · 2022-03-16 12:33:58Z

7

First you can OrderBy by Special (note that false < true) and then you can use condition within ThenBy like this:

var result = persons
  .OrderBy(person => person.Special != "Yes")
  .ThenBy(person => person.Special == "Yes" ? person.Id : 0)
  .ThenBy(person => person.Special == "Yes" ? "" : person.Name);

edited Mar 16, 2022 at 12:33

answered Mar 16, 2022 at 12:29

Dmitrii Bychenko

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1 Comment

Tim Schmelter Over a year ago

I like the conditional sorting since i imagine that true is "higher" than false. But for all others i would make it more explicit: persons.OrderBy(p => p.Special == "Yes" ? 0 : 1)...

Victor · Accepted Answer · 2022-03-16 12:49:02Z

0

A non-linq version:

list.Sort((a, b) =>
{
    if (a.Special != b.Special)
    {
        return a.Special ? -1 : 1;
    }

    return a.Name.CompareTo(b.Name);
});

answered Mar 16, 2022 at 12:49

Victor

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