System.Text.DecoderReplacementFallback.DecoderReplacementFallback C# (CSharp) Метод

        public DecoderReplacementFallback(String replacement)
        {
            if (replacement == null)
                throw new ArgumentNullException("replacement");

            // Make sure it doesn't have bad surrogate pairs
            bool bFoundHigh=false;
            for (int i = 0; i < replacement.Length; i++)
            {
                // Found a surrogate?
                if (Char.IsSurrogate(replacement,i))
                {
                    // High or Low?
                    if (Char.IsHighSurrogate(replacement, i))
                    {
                        // if already had a high one, stop
                        if (bFoundHigh)
                            break;  // break & throw at the bFoundHIgh below
                        bFoundHigh = true;
                    }
                    else
                    {
                        // Low, did we have a high?
                        if (!bFoundHigh)
                        {
                            // Didn't have one, make if fail when we stop
                            bFoundHigh = true;
                            break;
                        }

                        // Clear flag
                        bFoundHigh = false;
                    }
                }
                // If last was high we're in trouble (not surrogate so not low surrogate, so break)
                else if (bFoundHigh)
                    break;
            }
            if (bFoundHigh)
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidCharSequenceNoIndex", "replacement"));

            strDefault = replacement;
        }