WCF: return only required properties on json

Question

Due to performance tuning, I would like to return only the required properties. Is there an opportunity / workaround? Pseudo / sample code for understanding:

[DataContract]
public interface IMemberOverview
{
    [DataMember]
    public int Id { get; set; }

    [DataMember]
    public string Name { get; set; }
}

[DataContract]
public interface IMemberDetail
{
    [DataMember]
    public int Id { get; set; }

    [DataMember]
    public string Name { get; set; }

    [DataMember]
    public string Status { get; set; }

    [DataMember]
    public string Infos { get; set; }
}

public class Member : IMemberOverview, IMemberDetail
{
    public int Id { get; set; }

    public string Name { get; set; }

    public string Status { get; set; }

    public string Infos { get; set; }
}

and service:

[OperationContract]
[WebInvoke(
    Method = "GET",
    RequestFormat = WebMessageFormat.Json,
    ResponseFormat = WebMessageFormat.Json,
    UriTemplate = "ListMembers")]
[KnownType(typeof(Member))]
public List<IMemberOverview> ListMembers()
{
    return MemberDAO.Instance().GetAll();
}

[OperationContract]
[WebInvoke(
    Method = "GET",
    RequestFormat = WebMessageFormat.Json,
    ResponseFormat = WebMessageFormat.Json,
    UriTemplate = "Member/{idString}")]
[KnownType(typeof(Member))]
public List<IMemberDetail> Member(string idString)
{
    var id = int.Parse(idString);
    return MemberDAO.Instance().Get(id);
}

Answer 1

, - DTO - ( ) . ( - , , , ), , PropertyCopy ().

DTO .

Answer 2

, [DataMember (EmitDefaultValue = false)].