Multilevel Sorting with IComparable and IComparer: Listing 4.

Several sort orders but no default order.

public class City
{
  private string name;
  private double population;
  private string region;

  public City(string name, double population, string region) { . . }
  public override string ToString() { . . }

  public class SortByNameAscending : IComparer<City> { . . }
  public class SortByNameDescending : IComparer<City> { . . }
  public class SortByPopulationName : IComparer<City> { . . }
}

About the Author

Dr. James McCaffrey works for Microsoft Research in Redmond, WA. James has worked on several key Microsoft products such as Internet Explorer and Bing. James can be reached at jamccaff@microsoft.com.