System.ConsolePal.WriteSetColorString C# (CSharp) Method

        private static void WriteSetColorString(bool foreground, ConsoleColor color)
        {
            // Changing the color involves writing an ANSI character sequence out to the output stream.
            // We only want to do this if we know that sequence will be interpreted by the output.
            // rather than simply displayed visibly.
            if (Console.IsOutputRedirected)
                return;

            // See if we've already cached a format string for this foreground/background
            // and specific color choice.  If we have, just output that format string again.
            int fgbgIndex = foreground ? 0 : 1;
            int ccValue = (int)color;
            string evaluatedString = s_fgbgAndColorStrings[fgbgIndex, ccValue]; // benign race
            if (evaluatedString != null)
            {
                WriteStdoutAnsiString(evaluatedString);
                return;
            }

            // We haven't yet computed a format string.  Compute it, use it, then cache it.
            string formatString = foreground ? TerminalFormatStrings.Instance.Foreground : TerminalFormatStrings.Instance.Background;
            if (!string.IsNullOrEmpty(formatString))
            {
                int maxColors = TerminalFormatStrings.Instance.MaxColors; // often 8 or 16; 0 is invalid
                if (maxColors > 0)
                {
                    int ansiCode = _consoleColorToAnsiCode[ccValue] % maxColors;
                    evaluatedString = TermInfo.ParameterizedStrings.Evaluate(formatString, ansiCode);

                    WriteStdoutAnsiString(evaluatedString);

                    s_fgbgAndColorStrings[fgbgIndex, ccValue] = evaluatedString; // benign race
                }
            }
        }