[question] Can I ignore all properties and field as default?

[TMaddox]

I want to ignore all properties and fields in all classes for serialization by default and only serialize them when decorated with an [CborProperty("name")] attribute. Ist that possible? If not I would like to request this feature.

[mcatanzariti]

Yes you can but it will require a little bit of code:

        public class OptInObjectMappingConventionProvider : IObjectMappingConventionProvider
        {
            public IObjectMappingConvention GetConvention(Type type)
            {
                // here you could filter which type should be optIn and return null for other types
                return new OptInObjectMappingConvention();
            }
        }

        public class OptInObjectMappingConvention : IObjectMappingConvention
        {
            private readonly DefaultObjectMappingConvention _defaultConvention = new DefaultObjectMappingConvention();

            public void Apply<T>(SerializationRegistry registry, ObjectMapping<T> objectMapping) where T : class
            {
                _defaultConvention.Apply(registry, objectMapping);

                // restrict to members holding CborPropertyAttribute
                objectMapping.SetMemberMappings(objectMapping.MemberMappings
                    .Where(m => m.MemberInfo.IsDefined(typeof(CborPropertyAttribute)))
                    .ToList());
            }
        }

        public class OptInObject1
        {
            [CborProperty]
            public int Id { get; set; }

            public string Name { get; set; }
        }

        public class OptInObject2
        {
            public int Id { get; set; }

            [CborProperty]
            public string Name { get; set; }
        }

        public void OptInTest()
        {
            CborOptions options = new CborOptions();
            options.Registry.ObjectMappingConventionRegistry.RegisterProvider(
                new OptInObjectMappingConventionProvider()
            );

            OptInObject1 obj1 = new OptInObject1 { Id = 12, Name = "foo" };
            const string hexBuffer1 = "A16249640C";
            Cbor.Serialize(obj1, inputBuffer, options);

            OptInObject2 obj2 = new OptInObject2 { Id = 12, Name = "foo" };
            const string hexBuffer2 = "A1644E616D6563666F6F";
            Cbor.Serialize(obj2, inputBuffer, options);
        }

[TMaddox]

works like a charm, thanks!