F#交互式，对DLL引用的API限制 [英] F# interactive, API restriction on dll referencing

问题描述

您如何解决如下所示的错误消息?

How do you solve the error message that looks like this?

`Binding session to 'C:\Program Files (x86)\NLog\.NET Framework 4.0\NLog.dll'...

error FS0193: API restriction: The assembly 
'file:///C:\Program Files (x86)\NLog\.NET Framework 4.0\NLog.dll' has 
already loaded from a different location. It cannot be loaded from a 
new location within the same appdomain.

触发它的代码可能看起来像这样:

Code that triggers it, might look like this:

#r @"..\packages\NLog.2.0.0.2000\lib\net20\NLog.dll"
NLog.Config.SimpleConfigurator.ConfigureForConsoleLogging()

推荐答案

似乎FSI不会从给定的DLL中加载，而不会按名称加载，因此这可以解决问题:

It seems that FSI won't load from the given DLL other than by name, so this would sort the problem out:

#I @"..\packages\NLog.2.0.0.2000\lib\net20"
#r @"NLog.dll"
NLog.Config.SimpleConfigurator.ConfigureForConsoleLogging()

#I表示将该文件夹添加到加载路径

#I means to add that folder to the load-path

#r表示通过dll路径引用；专注于名字.这意味着FSI将首先使用文件名，在系统范围内的搜索路径中查找，然后才尝试使用#r之后的字符串作为相对于目录的提示.

#r means to reference by dll-path; focusing on name. This means that FSI will use the file name first, looking in the system-wide search path and only then try to use the string after #r as a directory-relative hint.

因此，通过这种方式，您可以从指定目录而不是系统范围的目录中加载NLog.

So by doing it this way, you make the NLog load from your specified directory rather than a system-wide one.

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