Wcf service sending list of class objects with null values

Question

The issue is when wcf service is sending the list of class objects to client, the values are null. Any help or guidance is appreciated.

My service interface is

IPswdService.cs

namespace GetPasswordsSvc
{
    [ServiceContract]
    public interface IPswdService
    {
        [OperationContract]
        List<dbVal> GetData(int value);
    }

[DataContract]
    public class dbVal
    {
        public string Group;
        public string Title;
        public string Username;
    } ;
}

GetPasswords.svc.cs

namespace GetPasswordsSvc
{
    public class PswdService : IPswdService
    {

       public List<dbVal> GetData(int value)
        {
          List<dbVal> kpdata= (from entry in db.RootGroup.GetEntries(true)
                         select new dbVal
                         {
                             Group = entry.ParentGroup.Name,
                             Title = entry.Strings.ReadSafe("Title"),
                             Username = entry.Strings.ReadSafe("UserName"),
                         }).ToList();

            List<dbVal> l = kpdata.ToList();
             return l;
        }

======================================

WCF Client code

SvcRef.PswdServiceClient wcfClient = new SvcRef.PswdServiceClient();
wcfClient.Open();
List<GetPasswords.dbVal> dbValues = wcfClient.GetData(0);

==============================================

The client config file is

<system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding_IPswdService" closeTimeout="00:01:00"
          openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
          allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
          maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
          messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
          useDefaultWebProxy="true">
          <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
            maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <security mode="None">
            <transport clientCredentialType="None" proxyCredentialType="None"
              realm="" />
            <message clientCredentialType="UserName" algorithmSuite="Default" />
          </security>
        </binding>
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://xxxxxxx:444/GetPasswords.svc" binding="basicHttpBinding"
        bindingConfiguration="BasicHttpBinding_IPswdService" contract="SvcRef.IPswdService"
        name="BasicHttpBinding_IPswdService" />
    </client>
  </system.serviceModel>

I forgot to add the [DataMember] tags to the attributes in dbVal class. After adding it, the issue was solved. This is what happens, when things run on caffeine for extended period. — Daniel, Jun 29 '12 at 21:16

score 2 · Answer 1 · answered Jun 29 '12 at 21:18

Hard to tell exactly what the cause is, but jus glancing at your service data contract, I can see that you've missed out the DataMember attribute on your data contarct fields, your data contract should be:

[DataContract]
public class dbVal
{
    [DataMember]
    public string Group;
    [DataMember]
    public string Title;
    [DataMember]
    public string Username;
}

Wcf service sending list of class objects with null values

IPswdService.cs

GetPasswords.svc.cs

WCF Client code

The client config file is

1 Answers1