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public sealed class WrappedComparer<T> : IComparer<T>
{
  readonly Comparison<T> comparison;

  public WrappedComparer(Comparison<T> comparison)
  {
    this.comparison = comparison;
  }

  int IComparer<T>.Compare(T x, T y)
  {
    return comparison(x, y);
  }
}					

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IComparer<int> reverseIntComparer = new WrappedComparer<int>(delegate(int left, int right)
{
  return -left.CompareTo(right);
});

SortedList<int, string> list = new SortedList<int, string>(reverseIntComparer);

list.Add(1, "a");
list.Add(2, "b");
list.Add(3, "c");
list.Add(4, "d");