OOO, C#, and C/AL

I’ve been working with building some web services built on the Microsoft Dynamics Nav 2009 web services platform. Microsoft is doing something fairly slick here - you write code in the C/AL language, save it as a Nav Object, expose it as a web service, and the web services layer automatically translates the C/AL to C# and runs it in .Net. This allows you to debug the code using visual studio, among other things.

But it’s not perfect. Sometimes it makes mistakes.

I had this line of code in C/AL

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IF AVSetup.”Sub Award Dimension No.” - 1 IN [1..8] THEN BEGIN

Which auto-translated to this in C#:

if(aVSetup.Target.GetFieldValueSafe(90, NavType.Integer)
  .ToInt32()-(1 >= 1 && 1

Oops. The order of operations got mixed up. The C/AL code subtracts one, then sees if the value is between 1 and 8. The C# sees if 1 is between 1 and 8 (getting a boolean value) and then tries to subtract the boolean value from the number. C# then gives this error:

Operator ‘-‘ cannot be applied to operands of type ‘int’ and ‘bool’

Thankfully, the solution for this is simple. All you have to do is use extra parentheses to explicitly set the Order of Operations.

1
IF ((AVSetup.”Sub Award Dimension No.” - 1) IN [1..8]) THEN BEGIN