Sorting an IEnumerable<type> by three fields

Question

I have defined a type as follows:

public class myType
{
    public string firstName { get; set; }
    public string middleName { get; set; }
    public string lastName { get; set; }
}

I have an IEnumerable<myType>.

I want to use the .OrderBy() extention to sort my list of myType as follows.

The objects should be in order by last name. Where the last names are the same, they should be in order by first name. Where the first names are the same, they should be in order by middle name.

How do I do this?

Answer 1

var qry = items.OrderBy(x => x.lastName).ThenBy(x => x.firstName)
    .ThenBy(x => x.middleName);

or in LINQ syntax:

var qry = from x in items
          orderby x.lastName, x.firstName, x.middleName
          select x;