#if ...#else ...#endif之类的C#快捷方式#将某些内容定义为字符串 [英] C# shortcut for #if ... #else ... #endif like #define something as string

问题描述

在用于Mono的C#dotNET中，有一种更简单的方法吗?

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

在C语言中，我可以先#if然后#define某些内容，#else并将其定义为其他内容.

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

我知道C#预处理器不允许我想要的东西，但是有没有更简单的方法来应对Windows和Linux的SQLite之间的差异?

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?

谢谢，
吉姆

感谢那些回答的人.
现在，依赖SQLite的文件在开头包含这样的语句:

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

在C语言中，我会将所有内容放入.h文件中，并在需要的地方#include它.在Mono C#项目中有没有办法做到这一点?我没有尝试过.

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.

再次感谢，
吉姆

Thanks again,
Jim

推荐答案

好，您可以使用using别名指令:

Well, you can use a using alias directive:

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

然后，您可以在同一文件中的任何地方使用SQLiteConnection.

Then you can use SQLiteConnection everywhere within the same file.

不过，您可能希望使用适配器模式将其放在单个代码中，因此，其余所有代码可以是相同的方式.

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.

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