C# Preprocessor Directives

This section discusses the C# language's preprocessor directives:

• #if
• #else
• #elif
• #endif
• #define
• #undef
• #warning
• #error
• #line
• #region
• #endregion

While the compiler does not have a separate preprocessor, the directives described in this section are processed as if there was one; these directives are used to aid in conditional compilation. Unlike C and C++ directives, you cannot use these directives to create macros.

A preprocessor directive must be the only instruction on a line.

For more information, see 2.5 Pre-processing directives.

See Also

C# Programmer's Reference | Conditional Methods Tutorial