有没有办法在.NET Core库中包含.NET Framework代码? [英] Is there a way to have .NET Framework code in a .NET Core library?

问题描述

我们有一个商业库，我正在努力移植到.NET Core.我想保留其中几个调用，仅在以.NET标准运行时才使用.(出于好奇，一种方法是在Windows服务器上读取一个需要凭据才能访问的文件.)

We have a commercial library that I am working to port to .NET Core. There are a couple of calls in it I want to retain to use only if running in .NET standard. (For the curious, one set is to read a file on a Windows server that requires credentials to access.)

在那里:

1. 一个电话，它将告诉我是否在.NET Standard与.NET Core之间运行.
2. 是否有一种方法可以使类仅在标准情况下运行才能实例化/调用，但DLL在Core下仍可以正常加载?

推荐答案

根据您的描述，只有单个nuget程序包并能够根据nuget程序包所安装的框架指定不同的行为或依赖项，通过多目标假设您正在这样做或将要这样做.

Since what you describe, having a single nuget package and being able to specify different behaviours or dependencies depending on the framework the nuget package is installed into, can only be reached through Multi Targeting I will assume you are doing that or will be doing it.

一旦您拥有指定的目标框架，您可以在预编译块中使用预定义的变量:

Once you have specified target frameworks, you have pre-defined variables to use in precompile blocks:

#if NETFRAMEWORK
    // use full framework class here. You were installed into a full framework app or library
#elif NETCOREAPP
    // use .NET Core class here. You were installed into a .NET Core app or library
#else NETSTANDARD
    // uh... okay... you were installed into another .NET Standard library, 
    // we still have no idea where *that* might be installed... help? 
    // Maybe make it configurable after all?
#endif

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