#warning (C# Reference)

 

Updated: July 20, 2015

For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

#warning lets you generate a level one warning from a specific location in your code. For example:

#warning Deprecated code in this method.  

A common use of #warning is in a conditional directive. It is also possible to generate a user-defined error with #error.

// preprocessor_warning.cs  
// CS1030 expected  
#define DEBUG  
class MainClass   
{  
    static void Main()   
    {  
#if DEBUG  
#warning DEBUG is defined  
#endif  
    }  
}  

C# Reference
C# Programming Guide
C# Preprocessor Directives

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