My Doc's Got No Nodes

This is one of those problems that I couldn’t find the answer with google.

Trying to load a C++ mixed mode assembly (like a CLR class library) from a byte array instead of a file throws a FileLoadException.

// ClassLib.dll is a mixed-mode assembly (from a C++ CLR Class Library project

Assembly.Load("ClassLib"); // Works

using (var stream = new FileStream("ClassLib.dll", FileMode.Open, FileAccess.Read))
{
    var bytes = new byte[stream.Length];
    stream.Read(bytes, 0, bytes.Length);
    Assembly.Load(bytes); // System.IO.FileLoadException "Unverifiable code failed policy check. (Exception from HRESULT: 0x80131402)"
}

Comments

Hi, Did you find an answer to this ? This is anno…

Anonymous - May 12, 2009

Hi,
Did you find an answer to this ? This is annoying, and I have come across it too. Basically it seems you have to stream the files from your binary stream to disk, then use Assembly.Load. I am remoting and wanted to stream DLLs, not have to write them to disk, but cannot if they have native code inside.

Sean.

Since I couldn't build the C++ assembly with /clr:…

Mark - May 12, 2009

Since I couldn't build the C++ assembly with /clr:safe (apparently that will fix the problem) I had to load it from disk like you're doing.

Same probleme here :(

Anonymous - Aug 03, 2009

Same probleme here :(

Yes, you can't do that, and here's why: ht…

Anonymous - Mar 31, 2010

Yes, you can't do that, and here's why: http://connect.microsoft.com/VisualStudio/feedback/details/97801/loading-mixed-assembly-with-assembly-load-byte-throw-exception-changed-behaviour

I guess the mechanisms that windows uses to load a…

Mark - Mar 31, 2010

I guess the mechanisms that windows uses to load a native/mixed-mode dll from disk can't be applied to an arbitrary set of pages in memory - probably because there's no API equivalent to LoadLibrary to do it.