如何将不同组件中的对象相互转换？

I've run into this apparently not uncommon problem --

我遇到了这个显然不常见的问题 -

I have a interface in Assembly A.

我在Assembly A中有一个接口。
I am dynamically loading Assembly B, and trying to cast an object from it into my interface from Assembly A.

我正在动态加载程序集B,并尝试将其中的对象从程序集A转换到我的接口。
It's failing with an InvalidCastException.

它失败了InvalidCastException。

I've come to understand why -- a class in Assembly A and a class in Assembly B, even with the same name and the same code, are not the same thing and cannot be cast to one another.

我已经明白了为什么 - 程序集A中的类和程序集B中的类,即使具有相同的名称和相同的代码,也不是相同的东西,不能相互强制转换。

My question is: is there a solution to this? Is there any way I can make the two types compatible, or do I need to duplicate my interface in Assembly B and cast the object to that?

我的问题是:有解决方案吗?有什么方法可以使这两种类型兼容,或者我是否需要在程序集B中复制我的接口并将对象转换为该接口?

I'm loading Assembly B with Assembly.LoadFrom -- is there a different way to do that which would make them type-compatible?

我正在使用Assembly.LoadFrom加载程序集B - 是否有不同的方法可以使它们与类型兼容?

I can't be the first person to have this problem. What I'm trying to do would seem like a fairly common task with plugin architectures.

我不能成为第一个遇到这个问题的人。我想要做的事情似乎是插件架构相当普遍的任务。

2 个解决方案

#1

Duplicating is not the answer. Can Assembly B possibly reference Assembly A and consume the interface (or whatever) from there?

复制不是答案。装配B可能会引用装配A并从那里消耗接口(或其他)吗?

If not, declare the interface (or whatever) in a standalone dll that both Assembly A and Assembly B reference. Then there is only 1 version of the interface, and everything works.

如果没有,请声明程序集A和程序集B引用的独立dll中的接口(或其他)。然后只有一个版本的界面,一切正常。

#2

You can definitely cast from a type in one assembly to a type in another - otherwise we could never cast down from object :)

你绝对可以从一个程序集中的类型转换为另一个程序集中的类型 - 否则我们永远无法从对象中删除:)

I suspect the problem is that the interface has been loaded separately - I suspect that your Assembly B has loaded Assembly A again (possibly from somewhere else?).

我怀疑问题是接口已单独加载 - 我怀疑你的程序集B再次加载了程序集A(可能来自其他地方?)。

What does your file layout look like? If you're loading Assembly B from a different directory and it has a copy of Assembly A in its directory, it may be loading it from there. Assembly loading and binding is a tricky business. I recommend getting hold of "CLR via C#" and reading the chapter on it very carefully, and/or turning on Fusion logging to see what's going on.

你的文件布局是什么样的?如果您从另一个目录加载程序集B并且在其目录中有一个程序集A的副本,则可能从那里加载它。装配和装订是一项棘手的工作。我建议抓住“通过C#CLR”并仔细阅读其中的章节,和/或打开Fusion日志以查看正在发生的事情。

(I'm assuming that the type in assembly B really does implement the interface in assembly A, by the way? If not, that would explain it!)

(我假设程序集B中的类型确实实现了程序集A中的接口,顺便说一下?如果不是,那就解释了它!)

I have a fairly old article which acts as a sort of tutorial for this, by the way. It may help.

顺便说一下,我有一篇相当古老的文章作为一种教程。它可能有所帮助。

#1