Question

Say I have a Person class with Name, Age, Level properties.

I know how to order by one of the properties, with

        PersonList.Sort(delegate(Person p1, Person p2) {
            return p1.Name.CompareTo(p2.Name);
        });

But how can I order by Name, Age and Level.

An equivalente of the sql sentence : ORDER BY Name, Age, Level

Thank you

Answer 1

Adapting your current code:

PersonList.Sort(delegate(Person p1, Person p2) {
        int r = p1.Name.CompareTo(p2.Name);
        if (r == 0) r = p1.Age.CompareTo(p2.Age);
        if (r == 0) r = p1.Level.CompareTo(p2.Level);
        return r;
    });

or, a simple linq-ish solution:

PersonList = PersonList.OrderBy(p => p.Name)
                       .ThenBy(p => p.Age)
                       .ThenBy(p => p.Level).ToList();