Preprocessor Directives
In some programming languages, such as C++, the preprocessing stage is a separate process from compilation. This stage happens before the actual process of compilation. The following are some of the areas where preprocessing is useful:
Conditional compilation
Header files inclusion
Macro expansion
However, in C#, the only area where preprocessing is used for conditional inclusion and exclusion of code. Also, in C#, the compiler itself emulates the preprocessor.
A preprocessor directive is a special command that begins with the # symbol.
The preprocessor directives provided in C# are
#define
#undef
#if
#else
#elif
#endif
#warning
#error
#line
#region
#endregion
The following sections discuss each of these preprocessor directives in ...
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