C# Sort and OrderBy comparison

Anonymous User 3930 04 Feb 2014

I can sort a list using Sort or OrderBy. Which one is faster? Are both working on same algorithm?

List<Person> persons = new List<Person>();
persons.Add(new Person("P005","Janson"));
persons.Add(new Person("P002","Aravind"));
persons.Add(new Person("P007","Kazhal"));

persons.Sort((p1,p2)=>string.Compare(p1.Name,p2.Name,true));

var query = persons.OrderBy(n => n.Name, new NameComparer());
class NameComparer : IComparer<string>
{
    public int Compare(string x,string y)
    {
      return  string.Compare(x, y, true);
    }
}

Ask by Anonymous User

Updated 04 Feb 2014

1 Answers

Pravesh Singh 04 Feb 2014

Hi Ashish,

Try this:

class Program
{
    class NameComparer : IComparer<string>
    {
        public int Compare(string x, string y)
        {
            return string.Compare(x, y, true);
        }
    }
    class Person
    {
        public Person(string id, string name)
        {
            Id = id;
            Name = name;
        }
        public string Id { get; set; }
        public string Name { get; set; }
    }
    static void Main()
    {
        List<Person> persons = new List<Person>();
        persons.Add(new Person("P005", "Janson"));
        persons.Add(new Person("P002", "Aravind"));
        persons.Add(new Person("P007", "Kazhal"));
        Sort(persons);
        OrderBy(persons);
        const int COUNT = 1000000;
        Stopwatch watch = Stopwatch.StartNew();
        for (int i = 0; i < COUNT; i++)
        {
            Sort(persons);
        }
        watch.Stop();
        Console.WriteLine("Sort: {0}ms", watch.ElapsedMilliseconds);
        watch = Stopwatch.StartNew();
        for (int i = 0; i < COUNT; i++)
        {
            OrderBy(persons);
        }
        watch.Stop();
        Console.WriteLine("OrderBy: {0}ms", watch.ElapsedMilliseconds);
    }
    static void Sort(List<Person> list)
    {
        list.Sort((p1, p2) => string.Compare(p1.Name, p2.Name, true));
    }
    static void OrderBy(List<Person> list)
    {
        var result = list.OrderBy(n => n.Name, new NameComparer()).ToArray();
    }
}

On my computer when compiled in Release mode this program prints:

Sort: 1162ms

OrderBy: 1269ms

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