C# 使用接口的抽象属性行为

我有一个ITiming接口：

public interface ITiming
{
    DateTime CreatedAt { get; set; }
    DateTime UpdatedAt { get; set; }
}

还有几个实现它的类：

public class Post : ITiming
{
    public int IdPost { get; set; }
    public string Title { get; set; }
    public DateTime CreatedAt { get; set; }
    public DateTime UpdatedAt { get; set; }
}

在我的模型生成器中，我正在为每个实现它的实体设置

AfterSaveBehavior

，如下所示：

modelBuilder.Entity<Post>(entity =>
{
    entity.HasKey(e => e.IdPost);

    entity.Property(e => e.CreatedAt)
        .Metadata.AfterSaveBehavior = PropertySaveBehavior.Ignore;
});

---

你就快到了。只需使用即可访问属性可变元数据：

foreach (var entityType in modelBuilder.Model.GetEntityTypes())
{
    if (typeof(ITiming).IsAssignableFrom(entityType.ClrType))
    {
        entityType.FindProperty(nameof(ITiming.CreatedAt))
            .AfterSaveBehavior = PropertySaveBehavior.Ignore;
    }
}

或者，您可以忽略该接口并应用自定义的

DateTime CreatedAt

属性约定：

foreach (var property in modelBuilder.Model.GetEntityTypes()
    .SelectMany(t => t.GetProperties())
    .Where(p => p.ClrType == typeof(DateTime) && p.Name == "CreatedAt"))
{
    property.AfterSaveBehavior = PropertySaveBehavior.Ignore;
}

foreach (var property in modelBuilder.Model.GetEntityTypes()
    .SelectMany(t => t.GetProperties())
    .Where(p => p.ClrType == typeof(DateTime) && p.Name == "CreatedAt"))
{
    property.AfterSaveBehavior = PropertySaveBehavior.Ignore;
}