A super simple way to get the list of project files from a Visual Studio Solution file.

example.cs

public static void GetProjectFilesFromSolution(string solutionFile)
{
  if (File.Exists(solutionFile))
  {
    string cwd = Directory.GetCurrentDirectory();
    Directory.SetCurrentDirectory(Path.GetDirectoryName(solutionFile));

    // This is a hack for reading solution files but is better than the almost 100 lines of code
    // necessary to load a special MS assembly and parse the file the 'right way'
    string[] solutionContents = File.ReadAllLines(solutionFile);
    foreach (string line in solutionContents)
    {
      // It's a project definition line
      if (line.StartsWith("Project("))
      {
        string projFile = line.Split(new char[] { ' ' })[3].Trim(new char[] { '\"', ',' });
        // Do something with the file path here
        System.Console.WriteLine(Path.GetFullPath(projFile));
      }
    }
    Directory.SetCurrentDirectory(cwd);
  }
}