c# - XmlSerializer empty properties in class with interface -

i having api xml response, looks like:

<?xml version="1.0" encoding="utf-8" standalone="yes"?> <artists itemsperpage="30">   <artist id="a0d9633b">     <url>http://www.somesite.com/3df8daf.html</url>   </artist> </artists> 

for deserializing use classes:

[serializableattribute] [xmltypeattribute(typename = "result")] public abstract class result {     private int _itemsperpage;      [xmlattributeattribute(attributename = "itemsperpage")]     public int itemsperpage     {         { return this._itemsperpage; }         set { this._itemsperpage = value; }     } }  [serializableattribute] [xmltypeattribute(typename = "artists")] [xmlrootattribute(elementname = "artists")] public class artists : result, ienumerable<artist> {     private list<artist> _list;      [xmlelementattribute(elementname = "artist")]     public list<artist> list     {         { return this._list; }         set { this._list = value; }     }      public artists()     {         _list = new list<artist>();     }      public void add(artist item)     {         _list.add(item);     }      ienumerator ienumerable.getenumerator() { return _list.getenumerator(); }      public ienumerator<artist> getenumerator()     {         foreach (artist artist in _list)             yield return artist;     } }  [serializableattribute] [xmltypeattribute(typename = "artist")] [xmlrootattribute(elementname = "artist")] public class artist {     private string _mbid;     private string _url;      [xmlattributeattribute(attributename = "mbid")]     public string mbid     {         { return this._mbid; }         set { this._mbid = value; }     }      [xmlelementattribute(elementname = "url")]     public string url     {         { return this._url; }         set { this._url = value; }     }      public artist() { } } 

and how deserialization:

xmlserializer serializer = new xmlserializer(typeof(artists)); artists result = (artists)serializer.deserialize(new streamreader("artists.xml")); 

so, the problem is, when deserialization, itemsperpage doesn't have needed (30) value (it has default 0). however, if remove ienumerable<artist> interface , deserialize artists, value appear. can remove interface , leaves artists ienumerator<artist> getenumerator() method, fine, artists still can foreach'ed, no longer ienumerable<artist>. not want. problem not in base class, because can transfer property itemsperpage artists class, , deserialization result same.

any ideas how can deserialize itemsperpage value artists still being ienumerable<artist>?