我该如何处理与MEF相关的ReflectionTypeLoadException异常？

Question

我有三个项目，即Shell.Core ， Shell和Services.Employees 。 Shell从Services.Employees导入零件，即后者是外部项目，在任何解决方案项目中均未引用。 和Shell ，“ Shell.Core”也是WPF应用程序，而不是类库。 我将其作为DevExpress的项目类型启动，以包含对我所有正确的引用，因为它定义了某些共享的UI组件。

Services.Employees确实引用Core ，它定义了它使用的某些基类。 现在，当启动应用程序Shell ，它应该加载Core ，然后执行MEF组合，从DirectoryCatalog加载Services.Employees部件，但是MEF看到了对Core的依赖，并希望从该目录中加载它们，尽管宿主应用程序已经引用了这些Core依赖项。

例如，当我尝试合成时，出现如下错误：

异常：'TypeLoadException'：无法从程序集'XTime900.Shell.Core，Version = 1.0.0.0，Culture = neutral，PublicKeyToken = null'中加载类型'Shell.Core.MappedViewModel`1'。

我有什么办法呢？ 我是否还应该导入Shell.Core.MappedViewModel ，尽管它已经在引用的项目中？ 我是否应该将Core转换为类库，以便它以DLL的形式出现在目录目录中，而MEF会将其作为Services.Employees的依赖项进行加载？ 还有其他方法可以解决这个棘手的小问题吗？

Answer 1

看来这件事发生了。 Shell.Core.MappedViewModel1, referenced by the plugins, loaded the ViewModel types. Then, the MEF plugins referenced this project, and during composition, couldn't find the right objects. When I factored View Models out into a separate project, referenced by both Shell.Core.MappedViewModel1, referenced by the plugins, loaded the ViewModel types. Then, the MEF plugins referenced this project, and during composition, couldn't find the right objects. When I factored View Models out into a separate project, referenced by both Core和MEF导入Shell.Core.MappedViewModel1, referenced by the plugins, loaded the ViewModel types. Then, the MEF plugins referenced this project, and during composition, couldn't find the right objects. When I factored View Models out into a separate project, referenced by both ，所有这些都再次运行良好。