Unable to save obfuscated assembly

[answering007]

Hi,
I try to save obfuscated assembly (looks like .Net Reactor 4.8) using dnlib, but has an exception. My steps:

1. Test project with obfuscated assembly referenced
2. Create an instance of type from obfuscated assembly
3. Run the code:
   var module = typeof([type_from_ obfuscated_assembly]).Module;
   var modDef = ModuleDefMD.Load(module);
   if (modDef.IsIlOnly)
   modDef.Write(path_to_file);
   This code throws an exception:
   dnlib.DotNet.Writer.ModuleWriterException: Instruction operand is null.
   There were a lot of instructions with call opcode and null in operand.
   Is there any solution for this?

[0xd4d]

It's obfuscated and you should try de4dot first to clean it.

However, if you don't want to clean it, then you can still save it but it might not run afterwards. You can ignore all errors dnlib detects during writing by adding a dummy logger:

var mod = ModuleDefMD.Load(typeof(int).Module);
var writerOptions = new dnlib.DotNet.Writer.ModuleWriterOptions(mod);
writerOptions.Logger = DummyLogger.NoThrowInstance;
mod.Write(@"C:\out.dll", writerOptions);

[answering007]

The goal is to get clean working assembly.
Unfortunately de4dot 3.1.41592 didn’t reconstruct method bodies and I try to “dump” assembly, using dnlib. Do you plan to update .Net Reactor deobfuscator in de4dot?

[0xd4d]

If de4dot fails to deobfuscate it, email me the file.

[0xd4d]

My email address is seen when you start de4dot. You just replied to github.com's issue email. This is the wrong place to discuss de4dot.

[RexProg]

writerOptions.Logger = DummyLogger.NoThrowInstance;

I Use It
but my app get an exception
"Could not load file or assembly 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified."

what can i do to solve it?

[0xd4d]

You probably don't have an assembly resolver, see the readme file on the front page.

[RexProg]

                AssemblyResolver asmResolver = new AssemblyResolver();
                ModuleContext modCtx = new ModuleContext(asmResolver);               
                asmResolver.DefaultModuleContext = modCtx;              
                asmResolver.EnableTypeDefCache = true;
                GlobAssembly.Asm = ModuleDefMD.Load(GlobAssembly.AsmInputPath);
                GlobAssembly.Asm.Context = modCtx;
                GlobAssembly.Asm.Context.AssemblyResolver.AddToCache(GlobAssembly.Asm);

My code for resolve references is this
is it wrong?
Because now i have that problem too

[0xd4d]

Use this method.

[RexProg]

excuse me
my problem isn't solved
i made a simple project to show my problem

when i build with NoThrowInstance app have an exception
but without it app run correctly
anyway i need NoThrowInstance

[RexProg]

my problem is solved
ModuleWriterOptions();
i use this overloads
i change it to
ModuleWriterOptions(moduleDef);
and my problem solved
excuse me for my spam