Table of Contents

Class OwnedEntityAttribute

Namespace
Trellis.EntityFrameworkCore
Assembly
Trellis.EntityFrameworkCore.dll

Marks a composite ValueObject as an EF Core owned entity type, triggering source generation of the private parameterless constructor required for EF Core materialization.

[AttributeUsage(AttributeTargets.Class, Inherited = false, AllowMultiple = false)]
public sealed class OwnedEntityAttribute : Attribute
Inheritance
OwnedEntityAttribute
Inherited Members
Extension Methods

Examples

[OwnedEntity]
public partial class Address : ValueObject
{
    public string Street { get; private set; }
    public string City { get; private set; }
    public string State { get; private set; }

    public Address(string street, string city, string state)
    {
        Street = street;
        City = city;
        State = state;
    }

    protected override IEnumerable<IComparable?> GetEqualityComponents()
    {
        yield return Street;
        yield return City;
        yield return State;
    }
}
// Generator emits:
// partial class Address
// {
//     private Address()
//     {
//         Street = null!;
//         City = null!;
//         State = null!;
//     }
// }

Remarks

The decorated type must be partial and inherit from ValueObject. The source generator emits a private parameterless constructor that initializes all reference-type properties with null! to satisfy the compiler's nullability analysis.

Properties should be settable so EF Core can populate them during materialization. Use { get; private set; } as the supported, tested pattern.

Note — init-only properties. { get; init; } on properties of [OwnedEntity] types is not covered by Trellis tests today and is therefore not guaranteed to round-trip. Use { get; private set; }, which is the supported shape. The TRLS022 analyzer flags { get; init; } properties on [OwnedEntity] types.

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