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Xamarin 4.x Cross-Platform Application Development - Third Edition by Jonathan Peppers

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Using preprocessor statements

When using shared projects, one of your most powerful tools is the use of preprocessor statements. If you are unfamiliar with them, C# has the ability to define preprocessor variables such as #define IPHONE, and then using #if IPHONE or #if !IPHONE.

The following is a simple example of using the technique:

#if IPHONE 
  Console.WriteLine("I am running on iOS"); 
#elif ANDROID 
  Console.WriteLine("I am running on Android"); 
#else 
  Console.WriteLine("I am running on ???"); 
#endif 

In Xamarin Studio, you can define preprocessor variables in your project's options under Build | Compiler | Define Symbols, delimited with semicolons. These will be applied to the entire project. Be warned that you must set up these variables for each ...

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