MEF合成期间处理ReflectionTypeLoadException [英] Handle ReflectionTypeLoadException during MEF composition

问题描述

我在MEF中使用DirectoryCatalog来满足我的应用程序中的导入要求.但是，有时在目录中存在混淆的程序集，当我尝试编写目录时会导致ReflectionTypeLoadException.

I am using a DirectoryCatalog in MEF to satisfy imports in my application. However, there are sometimes obfuscated assemblies in the directory that cause a ReflectionTypeLoadException when I try to compose the catalog.

我知道我可以通过使用单独的目录或在DirectoryCatalog上使用搜索过滤器来解决此问题，但我想采用更通用的方法来解决此问题.有什么方法可以处理异常并允许合成继续进行?还是还有其他更通用的解决方案?

I know I can get round it by using a separate directory or by using a search filter on the DirectoryCatalog but I want a more general way to solve the problem. Is there some way I can handle the exception and allow composition to continue? Or is there another more general solution?

推荐答案

DirectoryCatalog已经具有捕获ReflectionTypeLoadException并忽略这些程序集的代码.不幸的是，由于我已经已报告，仅创建AssemblyCatalog仍不会触发异常，因此代码不起作用.

DirectoryCatalog already has code to catch ReflectionTypeLoadException and ignore those assemblies. Unfortunately, as I have reported, merely creating the AssemblyCatalog will not yet trigger the exception so that code doesn't work.

该异常实际上是由第一次调用AssemblyCatalog.Parts触发的.

The exception is actually triggered by the first call to AssemblyCatalog.Parts.

您不必自己使用MEF的DirectoryCatalog，而是必须自己做:

Instead of using the DirectoryCatalog from MEF, you will have to do it yourself:

• 扫描目录以查找程序集
• 加载每个程序集并为其创建一个AssemblyCatalog
• 调用AssemblyCatalog.Parts.ToArray()强制异常并捕获它
• 用AggregateCatalog
汇总所有好的目录

• scan a directory for assemblies
• load each assembly and creates a AssemblyCatalog for it
• invoke AssemblyCatalog.Parts.ToArray() to force the exception, and catch it
• aggregate all the good catalogs with a AggregateCatalog

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