How to use converters for nullable types

I have a backward compatibility requirement to serialize all enums and booleans as integer values. So I need my xml to contain

<STATUS>1</STATUS>
<COMPLETED>1</COMPLETED>

instead of

<STATUS>Ok</STATUS>
<COMPLETED>true</COMPLETED>

Specifically I use nullable enum an boolean types in my entities.

I got it to work by registering IConverters for <int?> and <bool?>

       private static IExtendedXmlSerializer CreateSerializer(string root) => new ConfigurationContainer()
            .EnableImplicitTyping(implicitTypes)
            .Type<T>().Name(root)
            .Type<int?>().Register().Converter().Using(NullableIntConverter.Default)
            .Type<bool?>().Register().Converter().Using(NullableBoolConverter.Default)
            .EnableThreadProtection()
            .Create();

        private class NullableIntConverter : IConverter<int?>
        {
            public static readonly NullableIntConverter Default = new NullableIntConverter();

            public bool IsSatisfiedBy(TypeInfo parameter)
                => parameter.AsType() == typeof(int?);

            public int? Parse(string data)
                => string.IsNullOrEmpty(data) ? (int?)null : int.Parse(data);

            public string Format(int? instance)
                => instance?.ToString();
        }

        private class NullableBoolConverter : IConverter<bool?>
        {
            public static readonly NullableBoolConverter Default = new();

            public bool IsSatisfiedBy(TypeInfo parameter)
                => parameter.AsType() == typeof(bool?);

            public bool? Parse(string data) => data switch
            {
                "0" => false,
                "1" => true,
                _ => null
            };

This is working for me with version 3.4.2 but stopped working in version 3.4.3 My guess that with the introduction of nullable types support, the converters are not overriding the default serialization.

Is there a workaround? I thought about using ISerializerExtension or IAlteration but couldn’t figure how to use those APIs.

[zvikara]

Thanks very much for the very quick response!!! I tested the fix with my code and it works!

[Mike-E-angelo]

This has been deployed to NuGet: https://www.nuget.org/packages/ExtendedXmlSerializer/

Thank you for taking the time to report this and improving ExtendedXmlSerializer. 👍

<div>ExtendedXmlSerializer 3.7.3</div><div>An extensible Xml Serializer for .NET that builds on the functionality of the classic XmlSerializer with a powerful and robust extension model.</div>