DbContext.OnModelCreating - 读取每个 DbSet 的自定义属性

Question

我有一个 IdSeqAttribute：

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

并像这样使用它（大约 60 个类）：

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

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

然后，我需要在 DbContext.OnModelCreating 上为每个 DbSet<> 获取此属性：

    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.
        }
    }

Answer 1

使用

ClrType

属性：

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