Newtonsoft.Json.Converters.StringEnumConverter.ReadJson C# (CSharp) Méthode

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Null)
            {
                if (!ReflectionUtils.IsNullableType(objectType))
                {
                    throw JsonSerializationException.Create(reader, "Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
                }

                return null;
            }

            bool isNullable = ReflectionUtils.IsNullableType(objectType);
            Type t = isNullable ? Nullable.GetUnderlyingType(objectType) : objectType;

            try
            {
                if (reader.TokenType == JsonToken.String)
                {
                    string enumText = reader.Value.ToString();

                    return EnumUtils.ParseEnumName(enumText, isNullable, !AllowIntegerValues, t);
                }

                if (reader.TokenType == JsonToken.Integer)
                {
                    if (!AllowIntegerValues)
                    {
                        throw JsonSerializationException.Create(reader, "Integer value {0} is not allowed.".FormatWith(CultureInfo.InvariantCulture, reader.Value));
                    }

                    return ConvertUtils.ConvertOrCast(reader.Value, CultureInfo.InvariantCulture, t);
                }
            }
            catch (Exception ex)
            {
                throw JsonSerializationException.Create(reader, "Error converting value {0} to type '{1}'.".FormatWith(CultureInfo.InvariantCulture, MiscellaneousUtils.FormatValueForPrint(reader.Value), objectType), ex);
            }

            // we don't actually expect to get here.
            throw JsonSerializationException.Create(reader, "Unexpected token {0} when parsing enum.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
        }