`#if DEBUG` vs. `[Conditional('DEBUG')]: Which Conditional Compilation Method Should You Choose?

#if DEBUG vs. [Conditional("DEBUG")]

In large-scale project development, choosing an appropriate conditional compilation method is crucial. There are two main options: #if DEBUG and [System.Diagnostics.Conditional("DEBUG")].

#if DEBUG

#if DEBUG Include code directly into the executable only if DEBUG is defined at compile time. This means that in release mode, the code inside #if DEBUG will not appear in the final executable, reducing file size and potentially increasing execution speed. However, this approach requires explicit use of #if DEBUG for each condition, which can lead to inconsistencies and maintenance headaches.

[System.Diagnostics.Conditional("DEBUG")]

[Conditional("DEBUG")] also performs conditional compilation, but it works differently than #if DEBUG. Code annotated with [Conditional("DEBUG")] will always be included in the IL (Intermediate Language) representation, but calls to this method will be ignored unless DEBUG is defined when compiling the calling assembly. This provides flexibility, allowing code to be included in the final executable but only executed when necessary.

Selection basis

The choice of

#if DEBUG and [Conditional("DEBUG")] depends on the developer's specific needs and preferences.

[Conditional("DEBUG")] Example:

This attribute is useful when you want to include code that verifies internal state or functionality, but only executes it when debugging. For example, you can use Conditional("DEBUG") while debugging to inspect property names at runtime.

#if DEBUG Example:

#if DEBUG is more suitable for situations where the entire code segment needs to be compiled conditionally, such as setting different service endpoints based on debug mode.

Compilation nuances

It is important to note that [Conditional("DEBUG")] calls are ignored at compile time, not at runtime. This means that once the library is compiled in release mode, calls to B() in A() will be ignored, even if DEBUG is defined in the calling assembly.

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