How can I sort a List by multiple T.attributes?

Question

Let\'s say I have a List of Songs.

Song {
    public string Name = \"\";
    public int PlayOrder = 0;
    }

Now I want to sort them first

Answer 1

If you only have one preferred way of sorting your Song class, you should implement IComparable and/or IComparable<Song>:

List<Song> songs = GetSongs();
songs.Sort(); // Sorts the current list with the Comparable logic

If you have multiple ways how you want to store your list, IEqualityComparer<T> is the interface you would like to implement. Then you can provide that comparer as argument in List<T>Sort().

Answer 2

return final.OrderBy(s => s.PlayOrder).ThenBy(s => s.Name);

Answer 3

If you want to continue using the sort method you will need to make your comparison function smarter:

final.Sort((x, y) => {
    var ret = x.PlayOrder.CompareTo(y.PlayOrder);
    if (ret == 0) ret = x.Name.CompareTo(y.Name);
    return ret;
});

If you want to use LINQ then you can go with what K Ivanov posted.