Newtonsoft.Json.JsonTextReader.ParseNumber C# (CSharp) Méthode

        private void ParseNumber(ReadType readType)
        {
            ShiftBufferIfNeeded();

            char firstChar = _chars[_charPos];
            int initialPosition = _charPos;

            ReadNumberIntoBuffer();

            // set state to PostValue now so that if there is an error parsing the number then the reader can continue
            SetPostValueState(true);

            _stringReference = new StringReference(_chars, initialPosition, _charPos - initialPosition);

            object numberValue;
            JsonToken numberType;

            bool singleDigit = (char.IsDigit(firstChar) && _stringReference.Length == 1);
            bool nonBase10 = (firstChar == '0' && _stringReference.Length > 1 && _stringReference.Chars[_stringReference.StartIndex + 1] != '.' && _stringReference.Chars[_stringReference.StartIndex + 1] != 'e' && _stringReference.Chars[_stringReference.StartIndex + 1] != 'E');

            if (readType == ReadType.ReadAsString)
            {
                string number = _stringReference.ToString();

                // validate that the string is a valid number
                if (nonBase10)
                {
                    try
                    {
                        if (number.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
                        {
                            Convert.ToInt64(number, 16);
                        }
                        else
                        {
                            Convert.ToInt64(number, 8);
                        }
                    }
                    catch (Exception ex)
                    {
                        throw ThrowReaderError("Input string '{0}' is not a valid number.".FormatWith(CultureInfo.InvariantCulture, number), ex);
                    }
                }
                else
                {
                    double value;
                    if (!double.TryParse(number, NumberStyles.Float, CultureInfo.InvariantCulture, out value))
                    {
                        throw ThrowReaderError("Input string '{0}' is not a valid number.".FormatWith(CultureInfo.InvariantCulture, _stringReference.ToString()));
                    }
                }

                numberType = JsonToken.String;
                numberValue = number;
            }
            else if (readType == ReadType.ReadAsInt32)
            {
                if (singleDigit)
                {
                    // digit char values start at 48
                    numberValue = firstChar - 48;
                }
                else if (nonBase10)
                {
                    string number = _stringReference.ToString();

                    try
                    {
                        int integer = number.StartsWith("0x", StringComparison.OrdinalIgnoreCase) ? Convert.ToInt32(number, 16) : Convert.ToInt32(number, 8);

                        numberValue = integer;
                    }
                    catch (Exception ex)
                    {
                        throw ThrowReaderError("Input string '{0}' is not a valid integer.".FormatWith(CultureInfo.InvariantCulture, number), ex);
                    }
                }
                else
                {
                    int value;
                    ParseResult parseResult = ConvertUtils.Int32TryParse(_stringReference.Chars, _stringReference.StartIndex, _stringReference.Length, out value);
                    if (parseResult == ParseResult.Success)
                    {
                        numberValue = value;
                    }
                    else if (parseResult == ParseResult.Overflow)
                    {
                        throw ThrowReaderError("JSON integer {0} is too large or small for an Int32.".FormatWith(CultureInfo.InvariantCulture, _stringReference.ToString()));
                    }
                    else
                    {
                        throw ThrowReaderError("Input string '{0}' is not a valid integer.".FormatWith(CultureInfo.InvariantCulture, _stringReference.ToString()));
                    }
                }

                numberType = JsonToken.Integer;
            }
            else if (readType == ReadType.ReadAsDecimal)
            {
                if (singleDigit)
                {
                    // digit char values start at 48
                    numberValue = (decimal)firstChar - 48;
                }
                else if (nonBase10)
                {
                    string number = _stringReference.ToString();

                    try
                    {
                        // decimal.Parse doesn't support parsing hexadecimal values
                        long integer = number.StartsWith("0x", StringComparison.OrdinalIgnoreCase) ? Convert.ToInt64(number, 16) : Convert.ToInt64(number, 8);

                        numberValue = Convert.ToDecimal(integer);
                    }
                    catch (Exception ex)
                    {
                        throw ThrowReaderError("Input string '{0}' is not a valid decimal.".FormatWith(CultureInfo.InvariantCulture, number), ex);
                    }
                }
                else
                {
                    string number = _stringReference.ToString();

                    decimal value;
                    if (decimal.TryParse(number, NumberStyles.Number | NumberStyles.AllowExponent, CultureInfo.InvariantCulture, out value))
                    {
                        numberValue = value;
                    }
                    else
                    {
                        throw ThrowReaderError("Input string '{0}' is not a valid decimal.".FormatWith(CultureInfo.InvariantCulture, _stringReference.ToString()));
                    }
                }

                numberType = JsonToken.Float;
            }
            else if (readType == ReadType.ReadAsDouble)
            {
                if (singleDigit)
                {
                    // digit char values start at 48
                    numberValue = (double)firstChar - 48;
                }
                else if (nonBase10)
                {
                    string number = _stringReference.ToString();

                    try
                    {
                        // double.Parse doesn't support parsing hexadecimal values
                        long integer = number.StartsWith("0x", StringComparison.OrdinalIgnoreCase) ? Convert.ToInt64(number, 16) : Convert.ToInt64(number, 8);

                        numberValue = Convert.ToDouble(integer);
                    }
                    catch (Exception ex)
                    {
                        throw ThrowReaderError("Input string '{0}' is not a valid double.".FormatWith(CultureInfo.InvariantCulture, number), ex);
                    }
                }
                else
                {
                    double value;
                    ParseResult parseResult = ConvertUtils.DoubleTryParse(_stringReference.Chars, _stringReference.StartIndex, _stringReference.Length, out value);
                    if (parseResult == ParseResult.Success)
                    {
                        numberValue = value;
                    }
                    else
                    {
                        throw ThrowReaderError("Input string '{0}' is not a valid double.".FormatWith(CultureInfo.InvariantCulture, _stringReference.ToString()));
                    }
                }

                numberType = JsonToken.Float;
            }
            else
            {
                if (singleDigit)
                {
                    // digit char values start at 48
                    numberValue = (long)firstChar - 48;
                    numberType = JsonToken.Integer;
                }
                else if (nonBase10)
                {
                    string number = _stringReference.ToString();

                    try
                    {
                        numberValue = number.StartsWith("0x", StringComparison.OrdinalIgnoreCase) ? Convert.ToInt64(number, 16) : Convert.ToInt64(number, 8);
                    }
                    catch (Exception ex)
                    {
                        throw ThrowReaderError("Input string '{0}' is not a valid number.".FormatWith(CultureInfo.InvariantCulture, number), ex);
                    }

                    numberType = JsonToken.Integer;
                }
                else
                {
                    long value;
                    ParseResult parseResult = ConvertUtils.Int64TryParse(_stringReference.Chars, _stringReference.StartIndex, _stringReference.Length, out value);
                    if (parseResult == ParseResult.Success)
                    {
                        numberValue = value;
                        numberType = JsonToken.Integer;
                    }
                    else if (parseResult == ParseResult.Overflow)
                    {
#if !(NET20 || NET35 || PORTABLE40 || PORTABLE) || NETSTANDARD1_1
                        string number = _stringReference.ToString();

                        if (number.Length > MaximumJavascriptIntegerCharacterLength)
                        {
                            throw ThrowReaderError("JSON integer {0} is too large to parse.".FormatWith(CultureInfo.InvariantCulture, _stringReference.ToString()));
                        }

                        numberValue = BigIntegerParse(number, CultureInfo.InvariantCulture);
                        numberType = JsonToken.Integer;
#else
                        throw ThrowReaderError("JSON integer {0} is too large or small for an Int64.".FormatWith(CultureInfo.InvariantCulture, _stringReference.ToString()));
#endif
                    }
                    else
                    {
                        string number = _stringReference.ToString();

                        if (_floatParseHandling == FloatParseHandling.Decimal)
                        {
                            decimal d;
                            if (decimal.TryParse(number, NumberStyles.Number | NumberStyles.AllowExponent, CultureInfo.InvariantCulture, out d))
                            {
                                numberValue = d;
                            }
                            else
                            {
                                throw ThrowReaderError("Input string '{0}' is not a valid decimal.".FormatWith(CultureInfo.InvariantCulture, number));
                            }
                        }
                        else
                        {
                            double d;
                            parseResult = ConvertUtils.DoubleTryParse(_stringReference.Chars, _stringReference.StartIndex, _stringReference.Length, out d);
                            if (parseResult == ParseResult.Success)
                            {
                                numberValue = d;
                            }
                            else
                            {
                                throw ThrowReaderError("Input string '{0}' is not a valid number.".FormatWith(CultureInfo.InvariantCulture, number));
                            }
                        }

                        numberType = JsonToken.Float;
                    }
                }
            }

            ClearRecentString();

            // index has already been updated
            SetToken(numberType, numberValue, false);
        }