Multilevel Sorting with IComparable and IComparer: Listing 3.

The CompareTo method.

public int CompareTo(City other)
if (String.Compare(, == 0 &&
    this.population == other.population &&
    RegionCompare(this.region, other.region) == 0)
  return 0;
else if (this.population > other.population)
  return 1;
else if (this.population == other.population &&
  RegionCompare(this.region, other.region) > 0)
  return 1;
else if (this.population == other.population &&
  RegionCompare(this.region, other.region) == 0 &&
  String.Compare(, > 0)
  return 1;
  return -1;

About the Author

Dr. James McCaffrey works for Microsoft Research in Redmond, Wash. He has worked on several Microsoft products including Azure and Bing. James can be reached at [email protected].

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