I wanted to generate code but at the same time parse the target file first to see if any changes have been manually made or with the graphical designer.

I found the following parser for c# code: http://www.codeplex.com/csparser; it seems very active at the moment, and it parsed my test cs file without any problems.

I had some issues first understanding how to look for the current line number and how to know the name of the classes and methods etc. But a look at the sample file cmc.cs helped a lot.

using System;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;
using DDW.Collections;
using DDW;
using Microsoft.CSharp;

namespace test
{
  class Program
  {
    private static void PrintErrors(IEnumerable errors)
    {
        foreach (Parser.Error error in errors)
        {
            if(error.Token.ID == TokenID.Eof && error.Line == -1)
            {
                Console.WriteLine(error.Message + "\nFile: " + error.FileName + "\n");
            }
            else
            {
                Console.WriteLine(error.Message + " in token " + error.Token.ID
                    + "\nline: " + error.Line + ", column: " + error.Column
                    + "\nin file: " + error.FileName + "\n");
            }
        }
    }

    private static CompilationUnitNode ParseUnit(string fileName, List errors)
    {
        Console.Write("\nParsing " + fileName);
        FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
        StreamReader sr = new StreamReader(fs, true);
        Lexer l = new Lexer(sr);
        TokenCollection toks = l.Lex();

        Parser p = null;
        CompilationUnitNode cu = null;

        p = new Parser(fileName);
        cu = p.Parse(toks, l.StringLiterals);

        if(p.Errors.Count != 0)
        {
            Console.WriteLine();
            PrintErrors(p.Errors);
            errors.AddRange(p.Errors);
            return null;
        }
        return cu;
    }

    public static void Main(string[] args)
    {
      string filename = "c:\\myfile.cs";
      List errors = new List();
      CompilationUnitNode cu = ParseUnit(filename, errors);

      StringBuilder sb = new StringBuilder();
      cu.ToSource(sb);
      Console.WriteLine(sb.ToString());
      foreach (NamespaceNode nnode in cu.Namespaces)
      {
        foreach (ClassNode cnode in nnode.Classes)
        {
          Console.WriteLine("class name: " + cnode.Name.Identifier.ToString());
          foreach (FieldNode fnode in cnode.Fields)
          {
            foreach (QualifiedIdentifierExpression qexpr in fnode.Names)
            {
              sb = new StringBuilder();
              qexpr.Expressions.ToSource(sb);
              Console.WriteLine("Field: " + sb.ToString());
            }
          }
          foreach (MethodNode mnode in cnode.Methods)
          {
            sb = new StringBuilder();
            mnode.Names.ToSource(sb);
            if (sb.ToString() == "InitializeComponent")
            {
              Console.WriteLine("Line number of InitializeComponent starting: " + 
                                mnode.RelatedToken.Line.ToString());
              int firstLine = -1;
              int lastLine = -1;
              foreach (StatementNode snode in mnode.StatementBlock.Statements)
              {
                if (firstLine == -1)
                {
                  firstLine = snode.RelatedToken.Line;
                }
                lastLine = snode.RelatedToken.Line;
                sb = new StringBuilder();
                snode.ToSource(sb);
                string line = sb.ToString();
                Console.Write(snode.RelatedToken.Line.ToString() + ": " + line);

              }
            }
          }

        }
      }

      Console.Write("Press any key to continue . . . ");
      Console.ReadKey(true);
    }
  }
}
Use the CSParser to process C# files
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