Just write your application in Java!

Oh, wait, I just saw what group I'm in. My apologies. :-)

There's no particular reason you can't just ape what the Java folks are
doing. Java and C# are about on par now as far as support for genericity is
concerned (minor, niggling flamewars of epic proportion concerning the
implementation aside).

So when the Java library does

public interface Measurable<Q extends Quantity> extends
java.lang.Comparable<Measurable<Q>>

This maps one-to-one to the C# declaration

public interface IMeasurable<Q> : IComparable<IMeasurable<Q>> where Q :
IQuantity

And so on, and so forth. Of course, the interesting stuff (the
implementation behind all the type-enforced quantities) you don't get for
free, but the interfaces are certainly straightforward to st... borrow. The
library is distributed under the BSD license, so you don't even have to make
the stuff you st... borrow open. C# and Java are very close to each other in
terms of syntax, so you could just pick and choose the classes and methods
you need for your application and convert them to C#. This shouldn't take
too much effort.

Conceivably, you could easily have an NScience to go along with JScience,
much like with Log4J and Log4Net.