未檢查MEF插件依賴性未加載為插件目錄

Question

我遇到了MEF沒有為加載的組件獲取依賴關系的問題。 我們有一個目錄結構，如下所示：

C：/ MSMQ / DistributionService / [主要應用]

C：/ MSMQ / Providers / [插件組件]

當然，我們正在使用DirectoryCatalog，該插件被選中，但其中一個依賴項不是。 錯誤消息是：

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.

我相信這類似於MSDN上的一個問題： http ： //social.msdn.microsoft.com/Forums/en-US/MEFramework/thread/b34ef4f4-e1f1-4f06-bd42-d7b3d5060f6f/ - 但我不明白答案。

有沒有辦法提供從中提取問題的路徑，或任何其他建議的解決方案？

我們最近才開始遇到這個問題，但是在我們的源代碼管理歷史記錄中，我看不到任何我希望發生的變化。

Answer 1

您的一個或多個插件依賴於BusinessObjects程序集，而您的宿主應用程序不引用此程序集。 您可以執行以下任一操作來解決此問題：

1. 從主應用程序添加對此程序集的引用，以便插件在加載時可以使用它。
2. 將此程序集添加到C：\\ MSMQ \\ Providers目錄中，以便在加載插件並查找該程序集時，他們可以找到它並加載它。