当ServiceHost实例在WCF自托管中首次失败时,ServiceHost再次无法使用新的ServiceHost实例

时间:2013-08-13 22:17:52

标签: c# wcf .net-4.5

我的症状正如此帖所述http://social.msdn.microsoft.com/Forums/vstudio/en-US/302ca96e-a810-4958-9905-90ba1175765d/servicehost-does-not-detech-endpoints-cant-recover-from-a-faulted-state

我想知道这是否是一个已知的错误。

我的代码与Dave略有不同,而他的ServiceHost实例(名为WebService)不在Start()方法中。我的ServiceHost实例(命名主机)在里面声明。在调试时,我在主机描述中检查端点的地址已更改为正确的IP。但是,Open()仍然会使用旧的错误IP地址抛出异常。

    private bool InitHost(PtiType type, string serverIp, int portNumber)
    {
        if (!HostDictionary.ContainsKey(type))
        {
            Uri addressBase = new Uri(String.Format("net.tcp://{0}:{1}/CommunicationService/{2}", serverIp, portNumber.ToString(), type.ToString()));
            var service = new PtiCommunicationService(type);

            service.ClientConnected += service_ClientConnected;
            service.ClientBroadcasted += service_ClientBroadcasted;
            service.ClientSentTo += service_ClientSentTo;
            service.ClientDisconnected += service_ClientDisconnected;

            var host = new ServiceHost(service, addressBase);

            //For publishing metadata only
            //Define Metadata endPoint, So we can publish information about the service
            ServiceMetadataBehavior mBehave = new ServiceMetadataBehavior();
            host.Description.Behaviors.Add(mBehave);

            //Enable debug info in fault
            ((ServiceDebugBehavior)host.Description.Behaviors[typeof(ServiceDebugBehavior)]).IncludeExceptionDetailInFaults=true;

            host.AddServiceEndpoint(typeof(IPtiCommunication), new NetTcpBinding(SecurityMode.None), "");
            host.AddServiceEndpoint(typeof(IMetadataExchange),
                MetadataExchangeBindings.CreateMexTcpBinding(),
                "mex");

            try
            {
                host.Open();

                //Add host to dictionary to keep track
                HostDictionary.Add(type, host);

                LogList.Add(String.Format("{0}\tThe service {1} at {2} is ready", DateTime.Now.ToLongTimeString(), service.ServiceType.ToString(), serverIp));

                string hostInfo = String.Format("{0}\tHost information:\n", DateTime.Now.ToLongTimeString());

                hostInfo += "Enpoints details:\n";
                foreach (var endpt in host.Description.Endpoints)
                {
                    hostInfo += String.Format("\t Name:\t\t{0}\n", endpt.Name);
                    hostInfo += String.Format("\t Logical address:\t{0}\n", endpt.Address);
                    hostInfo += String.Format("\t Physical address:\t{0}\n", endpt.ListenUri);
                    hostInfo += String.Format("\t Binding:\t\t{0}\n", endpt.Binding);
                    hostInfo += String.Format("\t Contract:\t{0}\n\n", endpt.Contract.ContractType.Name);
                }
                LogList.Add(hostInfo);
            }
            catch (Exception e)
            {
                host.Abort();
                host = null;
                LogList.Add(String.Format("{0}\t{1}", DateTime.Now.ToLongTimeString(), e.Message));
            }
            return true;
        }
        return false;
    }

这是我的PtiCommunicationService的ServiceBehavior

[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single,
 ConcurrencyMode = ConcurrencyMode.Multiple, UseSynchronizationContext = false)]
接口的

和ServiceContract

[ServiceContract(CallbackContract = typeof(IPtiCommunicationCallback), SessionMode = SessionMode.Required)]

app.config中没有其他配置。所有都在代码中。

由于

更新:

我发现我们都为ServiceHost构造函数(Object,Uri [])使用相同的重载,它构成了Web服务的单例。

当我们使用相同的单例创建新的服务主机时,以某种方式更改端点地址不会生效,因为即使主机已中止,服务实例仍然存在。

在我们创建新主机时,是否有任何解决方案来清理该单例?

到目前为止,这是我的怀疑,如果我错了,请纠正我。

1 个答案:

答案 0 :(得分:0)

显然WCF缓存了一些套接字信息。我发现最好的解决方法是Ivan在这里https://stackoverflow.com/a/6839265/955400给出的。在尝试调用host.Open()之前,请检查是否可以打开连接。