public ZSubtype(ZFeatureClass parent, int code, string name)
     : base()
 {
     this.Parent = parent;
     this.Code = code;
     this.Name = name;
 }
 public ZField(ZFeatureClass parent, IField field)
     : base()
 {
     this.Parent = parent;
     this.Name = field.Name;
     this.Alias = field.AliasName;
     this.Type = field.Type.ToZFieldType();
 }