"BadImageFormatException: No string associated with token." occured when Load and Write DirectWriteForwarder.dll

[yangzhongke]

DirectWriteForwarder.dll is an assembly of WPF(.NET Core 6). When I load and write the assembly, the application crashed and "BadImageFormatException: No string associated with token." occured .

1. Create a WPF application using .NET Core 6.
2. publish the application with 'self-contained'.
3. Run the following code to edit the file of DirectWriteForwarder.dll in the published directory:

string filename = @"E:\temp\publish\DirectWriteForwarder.dll";
using MemoryStream ms = new MemoryStream();
using (var mod = ModuleDefMD.Load(filename))
{
    if(mod.IsILOnly)
    {
        mod.Write(ms);
    }
    else
    {
        mod.NativeWrite(ms);
    }
}
ms.Position = 0;
File.WriteAllBytes(filename, ms.ToArray());

4. Try to launch the WPF executable file, and it cannot starts properly.
5. Check Windows Event Viewer, the following log can been seen.
   

Thanks.

[wtfsck]

I won't have time to check why it fails, but you could force calling NativeWrite() and you could also enable some of the preserve mdtoken options.