未检查MEF插件依赖性未加载为插件目录

Question

我遇到了MEF没有为加载的组件获取依赖关系的问题。 我们有一个目录结构，如下所示：

C：/ MSMQ / DistributionService / [主要应用]

C：/ MSMQ / Providers / [插件组件]

当然，我们正在使用DirectoryCatalog，该插件被选中，但其中一个依赖项不是。 错误消息是：

2012-11-02 10:46:59,379 [1] FATAL - Assemblies required by Provider are not found
System.IO.FileNotFoundException: Could not load file or assembly 'BusinessObjects, Version=1.5.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
File name: 'BusinessObjects, Version=1.5.0.0, Culture=neutral, PublicKeyToken=null'

=== Pre-bind state information ===
LOG: User = <redacted>
LOG: DisplayName = BusinessObjects, Version=1.5.0.0, Culture=neutral, Public
KeyToken=null
 (Fully-specified)
LOG: Appbase = file:///C:/MSMQ/DistributionService/
LOG: Initial PrivatePath = NULL
Calling assembly : DistributedServicePropertyComponents, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\MSMQ\DistributionService\Distr
ibutionService.exe.Config
LOG: Using host configuration file:
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework64\
v4.0.30319\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partia
l, or location-based assembly bind).
LOG: The same bind was seen before, and was failed with hr = 0x80070002.

2012-11-02 10:46:59,401 [1] FATAL - Assemblies required by Provider are not found
System.IO.FileNotFoundException: Could not load file or assembly 'BusinessObjects, Version=1.5.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
File name: 'BusinessObjects, Version=1.5.0.0, Culture=neutral, PublicKeyToken=null'

=== Pre-bind state information ===
LOG: User = B2B\addisona
LOG: DisplayName = BusinessObjects, Version=1.5.0.0, Culture=neutral, Public
KeyToken=null
 (Fully-specified)
LOG: Appbase = file:///C:/MSMQ/DistributionService/
LOG: Initial PrivatePath = NULL
Calling assembly : DistributedServicePropertyComponents, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\MSMQ\DistributionService\DistributionService.exe.Config
LOG: Using host configuration file:
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework64\
v4.0.30319\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: The same bind was seen before, and was failed with hr = 0x80070002.

我相信这类似于MSDN上的一个问题： http ： //social.msdn.microsoft.com/Forums/en-US/MEFramework/thread/b34ef4f4-e1f1-4f06-bd42-d7b3d5060f6f/ - 但我不明白答案。

有没有办法提供从中提取问题的路径，或任何其他建议的解决方案？

我们最近才开始遇到这个问题，但是在我们的源代码管理历史记录中，我看不到任何我希望发生的变化。

Answer 1

您的一个或多个插件依赖于BusinessObjects程序集，而您的宿主应用程序不引用此程序集。 您可以执行以下任一操作来解决此问题：

1. 从主应用程序添加对此程序集的引用，以便插件在加载时可以使用它。
2. 将此程序集添加到C：\\ MSMQ \\ Providers目录中，以便在加载插件并查找该程序集时，他们可以找到它并加载它。