System.IO.Win32File.GetMode C# (CSharp) Méthode

        private static uint GetMode(FileMode mode)
        {
            uint umode = 0;
            switch (mode)
            {
                case FileMode.CreateNew:
                    umode = CREATE_NEW;
                    break;
                case FileMode.Create:
                    umode = CREATE_ALWAYS;
                    break;
                case FileMode.Append:
                    umode = OPEN_ALWAYS;
                    break;
                case FileMode.Open:
                    umode = OPEN_EXISTING;
                    break;
                case FileMode.OpenOrCreate:
                    umode = OPEN_ALWAYS;
                    break;
                case FileMode.Truncate:
                    umode = TRUNCATE_EXISTING;
                    break;
            }
            return umode;
        }