c# - 将其存储到静态变量时无法访问OperationContext.Current

我有一个由net.tcp绑定配置的WCF服务。我可以通过客户端访问该服务，并且可以调用其方法。我也可以到达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，我可以看到通道存储在CallBacker.Client上，但是当我调用CallBacker> Call（字符串消息）的“ Call”方法时，客户端为空。

奇怪的是，当我将服务配置从net.tcp设置为wsdualhttpbinding时，它可以正常工作。 net.tcp和wsdualhttpbinding之间是否有任何差异会导致此奇怪的问题？

最佳答案

似乎CallbackContract的类型应该为IServiceCallback
    [ServiceContract(CallbackContract = typeof(IServiceCallback))]

以下是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>

也请找到使用的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>

使用netTcpBinding时，CallBacker.Client保留CallBackContract的值，并且如果将CallBackContract更改为IServiceCallback，似乎没有任何问题。