/// <summary>
/// Add a field to this class
/// </summary>
/// <param name="f">Descriptor for the field to be added</param>
public void AddField(FieldDef f)
{
FieldDef field = (FieldDef)FindField(f.Name());
if (field != null)
throw new DescriptorException("Field " + field.NameString());
f.SetParent(this);
fields.Add(f);
}