public static bool ExecutionIsFromMSI()

in Configurator/Base/Classes/Utilities.cs [391:457]
59 lines of code
13 McCabe index (conditional complexity)

    public static bool ExecutionIsFromMSI(Version version)
    {
      if (version == null)
      {
        return false;
      }

      var keyName = string.Format(REGISTRY_KEY_TEMPLATE, version.Major, version.Minor);
      RegistryKey key = null;
      try
      {
        // Get installation reg key.
        key = Registry.LocalMachine.OpenSubKey(keyName);
        if (key == null)
        {
          key = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, Win32.Is64BitOs 
            ? RegistryView.Registry64 
            : RegistryView.Registry32).OpenSubKey(keyName);
        }

        if (key == null)
        {
          return false;
        }

        // Get registry key install location.
        var installLocation = key?.GetValue<string>("Location");
        if (string.IsNullOrEmpty(installLocation))
        {
          return false;
        }

        // Verify install location exists and has files. It's been identified that the server reg key will sometimes
        // not be removed, hence it is better to also check for the path to exist.
        if (!Directory.Exists(installLocation)
            || Directory.GetFiles(installLocation).Length == 0)
        {
          return false;
        }

        // Identify if exe is running from the MSI install location.
        string assemblyInstallLocation = null;
#if DEBUG
        assemblyInstallLocation = ConfigurationManager.AppSettings["installationDirectory"];
#else
        var assembly = Assembly.GetExecutingAssembly();
        var assemblyLocation = new DirectoryInfo(assembly.Location);
        if (assemblyLocation.Parent == null
            || assemblyLocation.Parent.Parent == null)
        {
          return false;
        }

        assemblyInstallLocation = assemblyLocation.Parent.Parent.FullName;
#endif

        var installLocationDirInfo = new DirectoryInfo(installLocation);
        var assemblyInstallLocationDirInfo = new DirectoryInfo(assemblyInstallLocation);
        return string.Compare(installLocationDirInfo.FullName.TrimEnd('\\'), assemblyInstallLocationDirInfo.FullName.TrimEnd('\\'), StringComparison.InvariantCultureIgnoreCase) == 0;
      }
      catch (Exception ex)
      {
        Logger.LogException(ex);
      }

      return false;
    }