Weird behaviour with conditional operator in .Net?

That seems like a nasty bug in Visual Studio debug mode which is fooling you: Now F10 to step over this line and you get: On the console correct values are printed WTF.

That seems like a nasty bug in Visual Studio debug mode which is fooling you: Now F10 to step over this line and you get: On the console correct values are printed. WTF.

– Darin Dimitrov Aug 29 '10 at 12:21 1 @JeremySpouken: That’s equivalent to Rectangle?. – Timwi Aug 29 '10 at 12:33 Interesting. I typed the same code into VS and I get the correct values (in both DEBUG and RELEASE mode)... – Timwi Aug 29 '10 at 12:38 @Timwi, what is the exact version number of VS you are using and the OS?

For me it's 10.0.30319.1 RTMRel running on Windows 7 x64. – Darin Dimitrov Aug 29 '10 at 12:40.

Rectangle cropArea = (!inputArea. HasValue)? Rectangle : inputArea.Value.

1 That’s equivalent. – Timwi Aug 29 '10 at 12:05 Now why the spam on my thread fellas :) @ InputArea = null; Nullable inputArea2 = null; @TimWi - now why the downvote .. was just trying to help the OP out? – nonnb Aug 29 '10 at 12:47 +1 because I made a mistake on your post and started a small flame war.

Turns out it is only the Silverlight Rectange class that is not nullable. – Tech Magic Aug 29 '10 at 14:35.

I just tried running that and it works fine. Make sure that image has a size and that inputArea is actually null.

Yes, all of which had seemed very weird, until I realized visual studio lied to me. See my edit. – Max Aug 29 '10 at 12:12 @Max: Maybe it was a good thing I didn't use VS, then.

– Matti Virkkunen Aug 29 '10 at 12:16.

Your code appears correct. The conditional expression (or conditional operator, or originally called the ternary operator... everyone happy now? :)) should be interchangeable with if/else statements.

Rectangle cropArea = inputArea == null? Rectangle : inputArea. Value; should be exactly the same as: Rectangle cropArea; if (inputArea == null) { cropArea = rectangle; } else { cropArea = inputArea.

Value; } (in fact they should generate the same IL code). Trace through with the debugger and see if anything jumps out at you.

Please don’t call the conditional operator “the ternary operatorâ€?. I’ve edited your answer to correct this, I hope you don’t mind. – Timwi Aug 29 '10 at 12:11.

Rectangle rectangle = ...; Rectangle cropArea; if (inputArea == null) cropArea = rectangle; else cropArea = inputArea. Value; if (inputArea == null) cropArea = rectangle; Why have the second if? It's totally and entirely redundant.

The scenario in which cropArea might still be null or zero is if inputArea. Value is null/zero, since you didn't check for that (only if inputArea is null).

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