合同要求使用双工，但是绑定“ BasicHttpBinding”不支持它，或者没有正确配置为支持它

Question

my project is silverlight and use Ria service. I want to create a WCF Service, this is my code

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
  [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
  public class MessageDuplex : IServiceSide
  {
    public void Attach(string s)
    {      
    }
  }

  [ServiceContract]
  interface IClientSide
  {
    [OperationContract(IsOneWay = true)]
    void SendMessage(string s);
  }

  [ServiceContract(CallbackContract = typeof(IClientSide))]
  interface IServiceSide
  {
    [OperationContract(IsOneWay = true)]
    void Attach(string s);
  }

When i defined IServiceSide without CallbackContract this is add to silverlight project correctly, but when i use CallbackContract this error raise when add Service Referense : "Contract requires Duplex, but Binding 'BasicHttpBinding' doesn't support it or isn't configured properly to support it."

Answer 1

BasicHttpBinding doesn't support duplex services. You must use PollingDuplexHttpBinding .