System.Text.InternalDecoderBestFitFallbackBuffer.GetNextChar C# (CSharp) Method

        public override char GetNextChar()
        {
            // We want it to get < 0 because == 0 means that the current/last character is a fallback
            // and we need to detect recursion.  We could have a flag but we already have this counter.
            iCount--;

            // Do we have anything left? 0 is now last fallback char, negative is nothing left
            if (iCount < 0)
                return '\0';

            // Need to get it out of the buffer.
            // Make sure it didn't wrap from the fast count-- path
            if (iCount == int.MaxValue)
            {
                iCount = -1;
                return '\0';
            }

            // Return the best fit character
            return cBestFit;
        }