#480 – Pre-Processing Directives

Pre-processing directives are elements that you can include in your source code that are not part of the source code itself.  Instead, they instruct the C# compiler to perform some particular action, like skipping compilation of a section of the code.

The pre-processing directives available in C# include:

  • #define/#undef – Define/undefine condition compilation symbols (see #if)
  • #if/#elif/#else/#endif – Skip compilation of a section of code based on the existence of a conditional compilation symbol
  • #line – specifies a line number to use when reporting errors
  • #error – issue errors during compilation
  • #warning – issue warnings during compilation
  • #region/#endregion – define a collapsible code region, to improve readability
  • #pragma warning – disable or restore certain compiler warnings
  • #pragma checksum – generate a checksum for an ASP.NET page, for debugging purposes

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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