自定义条件编译符号

Question

I'm currently struggling using custom configurations. My solution has one .NET Standard Library and two other Projects (one for Windows, one for Android) which uses the library.

What I try to do is giving the library the compiler constant WINDOWS and MOBILE.

Thats how I tried it several times:

1. Create two new configurations WindowsDE and MobileDE, copy settings from Debug configuration and create new project configuration. At some trys I also deleted the default Debug configuration but that didn't helped

2. Properties of the library -> Build, choose WindowsDE and put WINDOWS into Conditional compilation symbols field then choose MobileDE and put ANDROID in it.

I'm testing it with calling a method in the library :

#if WINDOWS
        System.Diagnostics.Debug.WriteLine("Windows");
#endif

#if ANDROID
        System.Diagnostics.Debug.WriteLine("Android");
#endif

But that doesn't work at all. Also just using

System.Diagnostics.Debug.WriteLine("anything");

without having any #if does not print and at some trys I could not even debug the library anymore.

Would appreciate any help on this

Answer 1

You can define conditional compiling constants in the project properties

#if WINDOWS
    System.Diagnostics.Debug.WriteLine("Windows"); // NOT printed!
#endif

#if ANDROID
    System.Diagnostics.Debug.WriteLine("Android"); // Printed!
#endif

You can enter several symbols separated by semicolons. Don't set them true or false . The ones that are listed are true . The missing ones are automatically false .

If neither the one nor the other prints, then possibly the solution does not compile and you are running an old code. Try to rebuild the solution.