Serializing public interface with internal implementation works with JSON but not with XML

[dancojocaru2000]

Description

Serialization of an internal implementation of a public interface to XML doesn't work.

Reproduction Steps

Write a public interface, implement it with an internal class, then try to serialize an instance of the class with System.Text.Json.JsonSerializer and with System.Xml.Serialization.XmlSerializer.

Expected behavior

Both should work.

Actual behavior

XML serialization fails with:

An error occurred while trying to create an XmlSerializer for the type 'InfoferScraper.Models.Train.TrainScrapeResult'.
System.InvalidOperationException: InfoferScraper.Models.Train.TrainScrapeResult is inaccessible due to its protection level. Only public types can be proce
ssed.

Regression?

No response

Known Workarounds

No response

Configuration

.NET 5

Other information

No response

[HongGit]

System.Xml.Serialization.XmlSerializer does not support this scenario. Please try DataContractSerializer.