How to enumerate column names with NHibernate?

I've got a class with a bunch of [ColumnName("foo")] NHibernate attributes. Is there an easy way to ask NHibernate to list all of the ColumnNames for a given class?

It sounds like it should be really easy but I'm just not seeing any kind of inspection in the NHibernate docs (or maybe I'm just blind today).

From stackoverflow

• Use LINQ and reflection:

  var columns = typeof(TheClass).GetProperties()
      .Where(property => property.GetCustomAttributes(typeof(ColumnNameAttribute), false).Count > 0)
      .Select(property => property.Name);
  

• Use NHibernate's Metadata

  // get an instance to the metadata 
  IClassMetadata metadata = sessionfactory.GetClassMetadata(typeof(MyEntity));
  
  // use properties and methods from the metadata:
  // metadata.PropertyNames
  // metadata.PropertyTypes
  // metadata.GetIdentifier()
  // and more
  
  // or get the metadata for all classes at once
  IDictionary allClassMetaData = factory.GetAllClassMetadata();
  metadata = allClassMetaData[typeof(MyEntity)];
  

  You get what NHibernate actually knows, independent of how it is defined; using attributes, xml mappings or FluentNHibernate. This makes it more stable and more reliable than using reflection on your own.

• I had this same problem, but found IClassMetadata doesn't have any column information, just property types, names, identifier, and table information.

  What worked for me:

  PersistentClass persistentClass = cfg.GetClassMapping(typeof(MyEntity));
  Property property = persistentClass.GetProperty(propertyName);
  property.ColumnIterator   // <-- the column(s) for the property