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Cross-Language Serialization

Apache Fory™ C# supports cross-language serialization with other Fory runtimes.

Enable Cross-Language Mode​

C# defaults to Xlang(true), but it is good practice to configure it explicitly in interoperability code.

Fory fory = Fory.Builder()
    .Xlang(true)
    .Compatible(true)
    .Build();

Register with Stable IDs​

[ForyObject]
public sealed class Person
{
    public string Name { get; set; } = string.Empty;
    public int Age { get; set; }
}

Fory fory = Fory.Builder()
    .Xlang(true)
    .Compatible(true)
    .Build();

fory.Register<Person>(100);

Use the same ID mapping on all languages.

Register by Namespace/Type Name​

fory.Register<Person>("com.example", "Person");

Cross-Language Example​

C# (Serializer)​

Person person = new() { Name = "Alice", Age = 30 };
byte[] payload = fory.Serialize(person);

Java (Deserializer)​

Fory fory = Fory.builder()
    .withLanguage(Language.XLANG)
    .withRefTracking(true)
    .build();

fory.register(Person.class, 100);
Person value = (Person) fory.deserialize(payloadFromCSharp);

Python (Deserializer)​

import pyfory

fory = pyfory.Fory(xlang=True, ref=True)
fory.register_type(Person, type_id=100)
value = fory.deserialize(payload_from_csharp)

Type Mapping Reference​

See xlang guide for complete mapping.

Best Practices​

  1. Keep type IDs stable and documented.
  2. Enable Compatible(true) for rolling upgrades.
  3. Register all user types on both read/write peers.
  4. Validate integration with real payload round trips.