C# list sort by two columns

Question

I have a C# custom object list that I need to sort by two different variables one is a boolean and the other is a string. I can sort by either of the criteria, but

Answer 1

Here is an extension method I wrote for sorting a list by any number of keys:

public static class ListExtensions
{
    public static void SortBy<T>(this List<T> list, params Expression<Func<T, IComparable>>[] keys)
    {
        if (list == null)
            throw new ArgumentNullException("list");
        if(keys == null || !keys.Any())
            throw new ArgumentException("Must have at least one key!");
        list.Sort((x, y) => (from selector in keys 
                             let xVal = selector.Compile()(x) 
                             let yVal = selector.Compile()(y) 
                             select xVal.CompareTo(yVal))
                             .FirstOrDefault(compared => compared != 0));
    }
}

Usage:

var List<Person> persons = GetPersons();
myList.SortBy(p => p.LastName, p => p.FirstName);

Note that this is roughly equivalent to: myList = myList.OrderBy(p => p.LastName).ThenBy(p => p.FirstName).