source: binary-improvements/NamePatcher/NamePatcher.cs@ 112

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using Mono.Cecil;
using System.Reflection;

namespace NamePatcher
{

        class NamePatcher
        {
                static void DrawUsage ()
                {
                        Console.WriteLine ("Usage :");
                        Console.WriteLine ("NamePatcher [input file]    Patches an Assembly and creates a backup of the original file.");
                }

                static bool TryArgs (string[] args)
                {
                        return args.Length == 1 && (File.Exists (args [0]));
                }

                static bool makeBackup (string input)
                {
                        string backupFile_base = input + ".bck";
                        string backupFile = backupFile_base;
                        int backupIndex = 0;
                        while (File.Exists(backupFile)) {
                                backupFile = backupFile_base + "." + (++backupIndex);
                                if (backupIndex > 10) {
                                        return false;
                                }
                        }
                        try {
                                File.Copy (input, backupFile);
                        } catch (Exception e) {
                                Console.WriteLine ("Unable to create backup file : ");
                                Console.WriteLine (e.ToString ());
                                return false;
                        }
                        return true;
                }

                static DefaultAssemblyResolver getAssemblyResolver (string path)
                {
                        DefaultAssemblyResolver resolver = null;
                        int lastSlash = path.LastIndexOf ("\\");
                        if (lastSlash == -1)
                                lastSlash = path.LastIndexOf ("/");
                        if (lastSlash != -1) {
                                string inputPath = path.Substring (0, lastSlash);
                                resolver = new DefaultAssemblyResolver ();
                                resolver.AddSearchDirectory (inputPath);
                        }
                        return resolver;
                }

                static void Main (string[] args)
                {
                        Console.WriteLine ("NamePatcher for 7dtd's Assembly-CSharp.dll [by DerPopo, modified by Alloc]");
                        if (!TryArgs (args)) {
                                DrawUsage ();
                                return;
                        }
                        string dllPath = args [0];

                        if (!makeBackup (dllPath)) {
                                Console.WriteLine ("Could not create a backup file (maybe too many old backups?)");
                                return;
                        }


                        AssemblyDefinition input;
                        try {
                                input = AssemblyDefinition.ReadAssembly (dllPath, new ReaderParameters { AssemblyResolver = getAssemblyResolver(dllPath), });
                        } catch (Exception e) {
                                Console.WriteLine ("Unable to load the input file : ");
                                Console.WriteLine (e.ToString ());
                                return;
                        }
                        Console.WriteLine ();
                        Console.WriteLine ("Patching assembly " + dllPath + " (" + input.Modules.Count + " module[s]) ...");



                        ManualPatches.applyManualPatches (input.MainModule);


                        try {
                                foreach (ModuleDefinition mdef in input.Modules) {
                                        Console.WriteLine ("Patching module " + mdef.Name + " (" + mdef.Types.Count + " type[s]) ...");
                                        foreach (TypeDefinition tdef in mdef.Types) {
                                                NameNormalizer.CheckNames (tdef);
                                        }
                                }
                        } catch (Exception e) {
                                Console.WriteLine ();
                                Console.WriteLine ("Unable to patch the assembly : ");
                                Console.WriteLine (e.ToString ());
                                return;
                        }
                        Console.WriteLine ("Finalizing patches...");

                        try {
                                NameNormalizer.FinalizeNormalizing ();
                        } catch (Exception e) {
                                Console.WriteLine ();
                                Console.WriteLine ("Unable to finalize patching : ");
                                Console.WriteLine (e.ToString ());
                                return;
                        }
                        NameNormalizer.clnamestomod.Clear ();
                        NameNormalizer.vclasses.Clear ();
                        Console.WriteLine ("Saving the patched assembly ...");

                        try {
                                input.Write (dllPath);
                        } catch (Exception e) {
                                Console.WriteLine ();
                                Console.WriteLine ("Unable to save the assembly : ");
                                Console.WriteLine (e.ToString ());
                                return;
                        }

                        Console.WriteLine ();
                        Console.WriteLine ("Success.");
                }
        }
}