public static void SetActor(
this IHaveExtensibleMetada e,
ICommand fromCommand) =>
e.Metadata.Actor = fromCommand.Principal
.Identity
.IfNotNull()
.Then(i => i.Name)
.ElseDefault();
public static void SetActor(this IHaveExtensibleMetada e,
string actor)
{
e.Metadata.Actor = actor;
}