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The C# code from ‘pragma foreign_proc’ declarations for C# will be placed in the bodies of static member functions of an automatically generated C# class. ‘pragma foreign_code’ can be used to define additional members of this automatically generated class, which can then be referenced by ‘pragma foreign_proc’ declarations for C# from that module.

For example:

:- pragma foreign_code("C#", "
    static int counter = 0;

:- impure pred incr_counter is det.
:- pragma foreign_proc("C#",
    [will_not_call_mercury], "

:- semipure func get_counter = int.
:- pragma foreign_proc("C#",
    get_counter = (Result::out),
    [will_not_call_mercury, promise_semipure],
    Result = counter;