Can something in C# change float comparison behaviour at runtime? [x64]

Question

I am experiencing a very weird problem with our test code in a commercial product under Windows 7 64 bit with VS 2012 .net 4.5 compiled as 64 bit.

The following test cod

Answer 1

When I create a test application containing your test, the exception is not thrown. This means it's not going to be straightforward. Some ideas to further investigate:

• If you run this test at the start of your application (e.g. in the Main/entry routine) does it fail then?
• If the above is true, start a new project using the same target framework & architecture which runs the same test. If it passes, start adding in bits of your primary application gradually and see if you can find which bit makes it fail.