C# shortcut for #if … #else … #endif like #define

问题:

In C# dotNET for Mono, is there an easier way of doing this?

#if __MonoCS__
    public static SqliteConnection NewConnection
#else
    public static SQLiteConnection NewConnection
#endif

In C I would be able to #if and then #define something, #else and define it as something else.

I know that the C# preprocessor doesn't allow what I want, but is there a simpler way of coping with the differences between SQLite for Windows and Linux?

Thanks,
Jim

---

Thanks to those who answered.
Files that depend on SQLite now contain statements like this at the beginning:

#if __MonoCS__
    using Mono.Data.Sqlite;
    using SQLiteCommand =     Mono.Data.Sqlite.SqliteCommand;
    using SQLiteConnection =  Mono.Data.Sqlite.SqliteConnection;
    using SQLiteException =   Mono.Data.Sqlite.SqliteException;
    using SQLiteParameter =   Mono.Data.Sqlite.SqliteParameter;
    using SQLiteTransaction = Mono.Data.Sqlite.SqliteTransaction;
#else
    using System.Data.SQLite;
#endif

In C I would put all that in a .h file and #include it where needed. Is there a way to do that in a Mono C# project? Nothing I tried worked.

Thanks again,
Jim

回答1:

Well, you can use a using alias directive:

#if __MonoCS__
using SQLiteConnection = Foo.Bar.SqliteConnection;
#endif

Then you can use SQLiteConnection everywhere within the same file.

You may want to use the adapter pattern to put this just in a single piece of code though, so all the rest of your code can be the same either way.