.NET Framework Standard Library Annotated Reference, Volume 1: Base Class Library and Extended Numerics Library

Type Summary

						public interface IComparer
{
  // Methods
     int Compare (object x, object y);
}

BG Note that the IComparer interface allows you to define your own ordering over types, when the original author may not have envisioned a need to sort the class. It's a great hook for comparison and sorting. Combined with IHashCodeProvider, you can use types as keys in a Hashtable even if the original class author neglected to override Equals and GetHashCode for their type.