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Editorial Team
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Asked: 2026-05-15T05:24:15+00:00

I’m going to give an example of using System.Data.SQLite.DLL which is a mixed assembly

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I’m going to give an example of using System.Data.SQLite.DLL which is a mixed assembly with unmanaged code:
If I execute this :

  var assembly= Assembly.LoadFrom("System.Data.SQLite.DLL")

No exceptions are thrown, but if I do this :

  var rawAssembly = File.ReadAllBytes("System.Data.SQLite.DLL");
  var assembly = Assembly.Load(rawAssembly);

The CLR throws a FileLoadException with “Unverifiable code failed policy check. (Exception from HRESULT: 0x80131402)”.
Let’s say I’m trying to load this assembly on a child AppDomain, how can I customize the AppDomain’s security to allow me pass the policy check?

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1 Answer

  1. Editorial Team

    We are the victim of a crummy exception message. Loading assemblies with Assembly.Load(byte[]) that contain unmanaged code is not supported. This is the subject of this feedback item.

    UPDATE: the linked feedback item is gone, deleted as part of the cleanup at VS2012 release time. The only part of it could still recover is this fragment, copied from another web page:

    “[…] we only allow ILOnly images to be loaded […] since anything else is not safe”–

    UPDATE: link fixed with archive.org backup copy.

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