Question

我已经创建了在网络上运行的WCF服务。当客户端尝试调用其中一个函数时（我正在调试并在调用进入时逐步检查），WCF服务中定义的所有变量都是NULL（例如，记录器类是在服务创建上定义的是NULL）。

我试图搜索这些条款，但结果是空的。有没有人有关于这个问题的经验？ WCF服务是在与服务器应用程序不同的线程上创建的。

编辑：

客户代码：

[ServiceContract]
public interface IInterface
{
    [OperationContract]
    string Ping();
}

public class Interface : IInterface
{
    public string Ping()
    {
        Logger.Debug("Interface Received Ping through WCF"); //Exception, logger is NULL
        return "Pong";
    }

    public void OpenHost()
    {
        try
        {
            Logger.Info("Interface OpenHost - WCF thread is initializing with ID:" + Thread.CurrentThread.ManagedThreadId.ToString());

            string MachineAddress = string.Format("{0}.{1}", System.Net.Dns.GetHostName(),System.Net.NetworkInformation.IPGlobalProperties.GetIPGlobalProperties().DomainName);
            baseAddress = new Uri(String.Format("http://{0}:8732/WCF/",MachineAddress) + "Interface_" + System.Diagnostics.Process.GetCurrentProcess().SessionId.ToString() + "_" + System.Diagnostics.Process.GetCurrentProcess().Id.ToString() + "/");

            Logger.Info("Interface OpenHost - WCF host will be started with baseAddress " + baseAddress.ToString());

            serviceHost = new ServiceHost(typeof(Interface), baseAddress);
            serviceHost.AddServiceEndpoint(typeof(IInterface), new BasicHttpBinding(), baseAddress);


            serviceHost.Open();
            Logger.Info("Interface OpenHost - WCF host ready and listening for incomming requests");
        }
        catch (Exception ex) { HandleException(ex, "OpenHost"); }
    }

客户代码：

                string sWCFUrl = WCFUrl + "?wsdl";
            //Create object of the Binding
            System.ServiceModel.Channels.Binding binding = new System.ServiceModel.BasicHttpBinding();

            //Create endpointAddress of the Service
            System.ServiceModel.EndpointAddress endpointAddress = new System.ServiceModel.EndpointAddress(sWCFUrl);
            //Create Client of the Service
            InterfaceService.InterfaceClient cc = new InterfaceService.InterfaceClient(binding, endpointAddress);

            //Call Service method using ServiceClient
            string ss = cc.Ping();

Answer 1

WCF服务应该尽可能无状态。我的意思是如果你想创建Logger类，我建议你创建一个静态变量。除此之外，您定义的任何变量都应该严格地位于方法的本地。话虽如此，我可能会误解问题，代码片段将有助于更好地理解问题。如果您确实想要在课程中初始化并拥有成员，您可能需要查看此内容：Sessions, Instancing and Concurrency。

调用WCF服务，内部变量为NULL

1 个答案: