This article illustrates a little tool for disassembling a .NET assembly IL code and making some patches.
For my application, I have used Mono.Cecil, a very powerful library for modifying IL code. If you want more info, visit the Cecil homepage.
Another Cecil article I found to be helpful is the one by ronnyek: MonoCecilChapter1.asp.
Using the code
You only need to load an assembly and look at all the types that it contains. When you click on one type, its methods and some information appear in the right. You can delete a type, delete a method, or edit the code of a method. In the Edit Code form, you can watch the IL code, remove a sentence, or insert a new sentence.
The basic code for using Cecil is:
AssemblyDefinition assembly = AssemblyFactory.GetAssembly("assembly.exe");
foreach(TypeDefinition type in assembly.MainModule.Types)
if(type.Name != "<Module>")
foreach(MethodDefinition method in type.Methods)
CilWorker worker = method.Body.CilWorker;
Instruction insertSentence = worker.Create(OpCodes.Ldstr, "Text");
Points of Interest
I want to improve the program and add some more options like methods insertion, feature to show C# code (like Reflector), and an improved instructions insertion.
- 22/04/2013 - Created github repository
- 2/06/2007 - Update version
- Code for IL tool added (only C# code)
- Support for edit instructions
- Filter for instructions
- Some minor changes and bugs fixed
- 1/06/2007 - Update version
- Instructions documentation and auto-complete
- Some interface changes
- Multi-instructions remover
- 31/05/2007 - First version