有没有办法在配置实体时将默认值（例如基于 IOptions）设置为忽略的属性？

Question

I have a property on my entity, that does not exist in the database, so during entity configuration, I ignore it:

builder.Ignore(m => m.MaxDeliveryAttempts);

However I need this property to be by default set to a value I get from my appsettings.json file.

I can get IOptions injected into by DbContext, but I cannot figure out how to force EF to set the value of MaxDeliveryAttempts from settings when it instantiates the entity.

Is it even possible?

Answer 1

You can configure the default value. For example:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<Blog>()
        .Property(b => b.Rating)
        .HasDefaultValue(3);
}

Reference: Default values