System.Runtime.Serialization.FormatterServices.GetSerializableFields C# (CSharp) Method

        private static FieldInfo[] GetSerializableFields(Type type)
        {
            if (type.IsInterface)
            {
                return Array.Empty<FieldInfo>();
            }

            if (!type.IsSerializable)
            {
                throw new SerializationException(SR.Format(SR.Serialization_NonSerType, type.FullName, type.Assembly.FullName));
            }

            var results = new List<FieldInfo>();
            for (Type t = type; t != typeof(object); t = t.BaseType)
            {
                foreach (FieldInfo field in t.GetFields(BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly))
                {
                    if ((field.Attributes & FieldAttributes.NotSerialized) != FieldAttributes.NotSerialized)
                    {
                        results.Add(field);
                    }
                }
            }
            return results.ToArray();
        }