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POIs ConditionalAttribute supposed to strip out entire lines, or just method calls?
 

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  1. POIs ConditionalAttribute supposed to strip out entire lines, or just method calls?
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    <p>According to the documentation on the <a href="http://msdn.microsoft.com/en-us/library/system.diagnostics.conditionalattribute.aspx" rel="noreferrer"><code>ConditionalAttribute</code></a> class:</p> <blockquote> <p>Applying ConditionalAttribute to a method indicates to compilers that a call to the method should not be compiled into Microsoft intermediate language (MSIL) unless the conditional compilation symbol that is associated with ConditionalAttribute is defined.</p> </blockquote> <p>To me this is saying that the <code>Conditional</code> attribute only alters behavior at the individual method call level. But consider the following code snippet:</p> <pre><code>class InstanceType { public InstanceType DoSideEffects() { Console.WriteLine("Side effects!"); return this; } public InstanceType DoMoreSideEffects() { Console.WriteLine("More side effects!"); return this; } [Conditional("DEBUG")] public void ConditionalMethod() { Console.WriteLine("Conditional method run."); } } class Program { static void Main() { var x = new InstanceType(); // The compiler appears to strip out this entire line // in a Release build. x.DoSideEffects().DoMoreSideEffects().ConditionalMethod(); var y = new InstanceType(); // When each method call appears on its own line, // the first two methods are included as expected. y.DoSideEffects(); y.DoMoreSideEffects(); y.ConditionalMethod(); } } </code></pre> <p>Compare the outputs of Debug and Release builds:</p> <pre> DEBUG RELEASE Side effects! Side effects! More side effects! More side effects! Conditional method run. Side effects! More side effects! Conditional method run. </pre> <p><strong>Is this behavior specified somewhere?</strong> I had thought that both builds were supposed to have the same output except for the lines reading "Conditional method run."</p>
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    1. USDan Tao
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      1. USMatt
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    1. COMy understanding of `[Conditional]` is the same as yours, and I think you are seeing the effect of an optimization take place here. What does the IL look like in release mode?
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      1. USSteve Guidi
    2. COInterestingly enough, even Visual Studio (or is it ReSharper?) colors the whole line gray/unused in the first case, if you do not define DEBUG. Whereas in the second, it only colors the call to ConditionalMethod() gray/unused.
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      1. USChristian.K
    3. COpossible duplicate of [Why does .NET's Conditional Attribute Cause Side-Effects to be Removed?](http://stackoverflow.com/questions/410865/why-does-nets-conditional-attribute-cause-side-effects-to-be-removed)
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      1. USAdam Sills
 

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