DbContext.OnModelCreating - Reading custom attribute for each DbSet

Question

I have a IdSeqAttribute:

[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
public class IdSeq(string seq) : Attribute
{
    public string Seq = seq;
}

and use it like this (about 60 classes):

[IdSeq("Customer")]
public class Customer : MyModel
{
    public string Nome { get; set; } = "";
}

[IdSeq("Product")]
public class Product : MyModel
{
    public string Nome { get; set; } = "";
}

Then, I need to get this attibute on DbContext.OnModelCreating, for each DbSet<>:

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
    
        foreach (var entityType in modelBuilder.Model.GetEntityTypes())
        {
            var annotatios = entityType.GetAnnotations();
            // here, I can see two attributes, but "IdSeq" isn't one of them.
        }
    }

Does this answer your question? How do I read an attribute on a class at runtime? — Svyatoslav Danyliv
– Svyatoslav Danyliv, Commented Dec 26, 2023 at 15:00
entityType.ClrType is your class type. Get attributes using standard technique. GetAnnotations() is not proper way, it is more EF Core API specific. — Svyatoslav Danyliv
– Svyatoslav Danyliv, Commented Dec 26, 2023 at 15:02

Guru Stron · Accepted Answer · 2023-12-26 15:02:55Z

1

Use the IReadOnlyTypeBase.ClrType property to get the entity type and get custom attributes from it:

var idSeq = entityType.ClrType.GetCustomAttribute<IdSeq>()

answered Dec 26, 2023 at 15:02

Guru Stron

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