The Author Online Book Forums are Moving

The Author Online Book Forums will soon redirect to Manning's liveBook and liveVideo. All book forum content will migrate to liveBook's discussion forum and all video forum content will migrate to liveVideo. Log in to liveBook or liveVideo with your Manning credentials to join the discussion!

Thank you for your engagement in the AoF over the years! We look forward to offering you a more enhanced forum experience.

TrueWill (22) [Avatar] Offline
"a product with an unknown price will be considered to be less expensive than $10, which is probably what we'd want."

I don't believe the above statement is correct.

decimal? price = null;

if (price < 10m)
Console.WriteLine("Null is less than 10");

The above code won't print anything. Comparing to null returns false. This is similar to the empty result set you'd get from an equivalent SQL query (ignoring the implications of UNKNOWN for the moment).
TrueWill (22) [Avatar] Offline
Re: Errata p. 13 section 1.1.4
Actually I'm going to correct myself. The example code is returning matches where p.Price > 10, so null would be considered less than or equal to $10 in this case (that is, excluded from the result set).

So it's not truly errata, but I did find it jarring. To me, the statement implies the false statement that null < 10.

Thanks for listening!
jon.skeet (483) [Avatar] Offline
Re: Errata p. 13 section 1.1.4
Thanks for the comments - I see what you'll mean. I'll add an entry to my list of errata ( if you weren't aware) for a language improvement. It's not the kind of thing that's likely to make it into revisions for just another printing, but if we do a full second edition (e.g. to support C# 4 when that comes out!) we'll try to improve things more at that point.

Thanks for paying such close attention, and I hope you enjoy the rest of the book!