Important
Inheritance
All Realm objects inherit from the
:dotnet-sdk:`IRealmObject <reference/Realms.IRealmObject.html>`,
:dotnet-sdk:`IEmbeddedObject <reference/Realms.IEmbeddedObject.html>`, or
:dotnet-sdk:`IAsymmetricObject <reference/Realms.IAsymmetricObject.html>`
interface and must be declared partial classes.
In versions of the .NET SDK older than 10.18.0, objects derive from :dotnet-sdk:`RealmObject <reference/Realms.RealmObject.html>`, :dotnet-sdk:`EmbeddedObject <reference/Realms.EmbeddedObject.html>`, or :dotnet-sdk:`AsymmetricObject <reference/Realms.AsymmetricObject.html>` base classes. This approach to Realm model definition is still supported, but does not include new features such as the :ref:`nullability annotations <dotnet-required-optional-property>`. In a future SDK release, the base classes will become deprecated. You should use the interfaces for any new classes that you write and should consider migrating your existing classes.