c# - 当我将它存储到静态变量时，我无法访问 OperationContext.Current

Question

我有一个通过 net.tcp 绑定(bind)配置的 WCF 服务。我可以通过客户端访问服务并调用它的方法。我也可以访问 OperationContext.Current。如:

[ServiceContract(CallbackContract = typeof(IServiceCallback))]
public interface IService
{
    [OperationContract(IsOneWay = true)]
    void Register();
}

---

[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Multiple)]
    public class Service :IService
    {
        public void Register()
        {
             CallBacker.Client = OperationContext.Current.
                                 GetCallbackChannel<IServiceCallback>();

        }
    }

}

---

public class CallBacker 
{
   public static IServiceCallback Client { get; set; }

   public void Call(string message)
   {
       Client.Test(message);
   }
}

当客户端调用 Service 的 Register 方法时，我可以看到 channel 存储在 CallBacker.Client 上，但是当我调用 CallBacker > Call(string message) 的“Call”方法时，Client 为空。

奇怪的是，当我将服务配置从 net.tcp 设置为 wsdualhttpbinding 时，它工作得很好。 net.tcp 和 wsdualhttpbinding 之间有什么不同会导致这个奇怪的问题吗？

Answer 1

CallbackContract 似乎应该是 IServiceCallback 类型 [ServiceContract(CallbackContract = typeof(IServiceCallback))]

下面是 wsDualHttpBinding 和 netTcpBinding 的配置

<services>
  <service behaviorConfiguration="behavior" name="WCFCallbackTry.Service1">
    <endpoint address="" binding="wsDualHttpBinding" bindingConfiguration="HttpEndPoint"
      contract="WCFCallbackTry.IService" name="HttpEndPoint"/>
    <endpoint address="net.tcp://localhost:8004/Service1.svc"  bindingConfiguration="BindingConfiguration" binding="netTcpBinding"
      contract="WCFCallbackTry.IService" name="NetTcpEndPoint"/>
    <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
    <host>
      <baseAddresses>
        <add baseAddress="http://localhost:8018/Service1.svc"/>
      </baseAddresses>
    </host>
  </service>
</services>

请同时找到使用的netTcpBinding

<netTcpBinding>
    <binding name="BindingConfiguration" receiveTimeout="infinite" sendTimeout="10.00:00:00" maxBufferPoolSize="1073741824" maxBufferSize="1073741824" maxReceivedMessageSize="1073741824">
      <readerQuotas maxDepth="32" maxStringContentLength="2147483647" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384"/>
      <reliableSession enabled="true" inactivityTimeout="01:00:00" ordered="true" />
    </binding>
  </netTcpBinding>

CallBacker.Client在使用netTcpBinding时持有CallBackContract的值，如果将CallBackContract改为IServiceCallback似乎没有任何问题