MicroLite.SqlUtility.GetParameterPosition C# (CSharp) Method

        private static int GetParameterPosition(string commandText, int position, char[] matchParameterIdentifiers)
        {
            if (commandText == null)
            {
                throw new ArgumentNullException("commandText");
            }

            if (position > commandText.Length)
            {
                throw new ArgumentOutOfRangeException("position");
            }

            var parameterPosition = commandText.IndexOfAny(matchParameterIdentifiers, position);

            while (parameterPosition > -1)
            {
                // Ignore identifiers followed by whitespace or linebreak.
                if (parameterPosition < commandText.Length && char.IsControl(commandText[parameterPosition + 1]))
                {
                    parameterPosition = commandText.IndexOfAny(matchParameterIdentifiers, parameterPosition + 1);
                    continue;
                }

                // Ignore @@ as we would have for SELECT @@Identity.
                if ((parameterPosition < commandText.Length && matchParameterIdentifiers.Contains(commandText[parameterPosition + 1]))
                    || (parameterPosition > 0 && matchParameterIdentifiers.Contains(commandText[parameterPosition - 1])))
                {
                    parameterPosition = commandText.IndexOfAny(matchParameterIdentifiers, parameterPosition + 1);
                    continue;
                }

                // Ignore identifiers inside a quoted string.
                if (commandText.IndexOfAny(quoteCharacters, position, parameterPosition - position) > -1
                    && commandText.IndexOfAny(quoteCharacters, parameterPosition) > -1)
                {
                    int quoteCount = 0;

                    for (int i = parameterPosition; i >= 0; i--)
                    {
                        if (commandText[i] == '\'')
                        {
                            quoteCount++;
                        }
                    }

                    if (quoteCount % 2 != 0)
                    {
                        parameterPosition = commandText.IndexOfAny(matchParameterIdentifiers, parameterPosition + 1);
                        continue;
                    }
                }

                break;
            }

            return parameterPosition;
        }