#gc.collect

CannotUnloadAppDomainException on AppDomain unload that has displayed a WPF Window/Dialog

Issue

You get CannotUnloadAppDomainException when trying to unload an AppDomain on which a WPF window has been displayed. This is how the exception looks like… ————————— AppDomainUnload ————————— Error while unloading appdomain. (Exception from HRESULT: 0x80131015) ————————— OK   —————————

The callstack associated with this exception is not at all informative. This is all that I have for this exception…