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C #: overridden methods with security attributes in .Net 4

In .Net 4, some methods are now decorated with different security attributes than they were in previous versions (i.e. the new SecurityCriticalAttribute). To override methods with security permissions, the relative security capabilities in the derived declaration must match those specified in the base declaration (or runtime exception).

Deprecated assemblies will not know these new attributes, and since the code has already been compiled and the metadata already created, we cannot load any type of those assemblies that override the method that now has the new attribute (as security, accessibility does not match).

Is .Net4 compatible with pre.Net4 assemblies? If so, then a workaround / solution for this?

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I have not stumbled upon this before, but after some research it seems that outdated support exists using the NetFx40_LegacySecurityPolicy option.

 <configuration> <runtime> <NetFx40_LegacySecurityPolicy enabled="true" /> </runtime> </configuration>
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