双工WCF + COM对象的静态集合

时间:2009-11-12 03:16:08

标签: wcf com duplex sta

我正在尝试构建一个WCF服务,该服务公开了我没有原始源的特定COM对象的功能。我正在使用双工绑定,以便每个客户端都有自己的实例,因为每个特定实例都绑定了通过回调(IAgent)传递的事件。似乎存在死锁或其他因素,因为在第一次操作之后,我的服务阻止了我的第二个动作的锁定。我已经尝试实现这些自定义STA属性和操作行为(http://devlicio.us/blogs/scott_seely/archive/2009/07/17/calling-an-sta-com-object-from-a-wcf-operation.aspx)但我的OperationContext.Current始终为null。任何建议都非常感谢。

服务

收集:

private static Dictionary<IAgent, COMAgent> agents = new Dictionary<IAgent, COMAgent>();

第一步:

    public void Login(LoginRequest request)
    {
        IAgent agent = OperationContext.Current.GetCallbackChannel<IAgent>();
        lock (agents)
        {
            if (agents.ContainsKey(agent))
                throw new FaultException("You are already logged in.");
            else
            {
                ICOMClass startup = new ICOMClass();

                string server = ConfigurationManager.AppSettings["Server"];
                int port = Convert.ToInt32(ConfigurationManager.AppSettings["Port"]);
                bool success = startup.Logon(server, port, request.Username, request.Password);

                if (!success)
                    throw new FaultException<COMFault>(new COMFault { ErrorText = "Could not log in." });

                COMAgent comAgent = new COMAgent { Connection = startup };
                comAgent.SomeEvent += new EventHandler<COMEventArgs>(comAgent_COMEvent);
                agents.Add(agent, comAgent);
            }
        }
    }

第二幕:

    public void Logoff()
    {
        IAgent agent = OperationContext.Current.GetCallbackChannel<IAgent>();
        lock (agents)
        {
            COMAgent comAgent = agents[agent];
            try
            {
                bool success = comAgent.Connection.Logoff();

                if (!success)
                    throw new FaultException<COMFault>(new COMFault { ErrorText = "Could not log off." });

                agents.Remove(agent);
            }
            catch (Exception exc)
            {
                throw new FaultException(exc.Message);
            }
        }
    }

1 个答案:

答案 0 :(得分:0)

看看这篇非常相似的帖子:http://www.netfxharmonics.com/2009/07/Accessing-WPF-Generated-Images-Via-WCF

您必须使用OperationContextScope从新生成的线程访问当前的OperationContext:

System.Threading.Thread thread = new System.Threading.Thread(new System.Threading.ThreadStart(delegate
    {
        using (System.ServiceModel.OperationContextScope scope = new System.ServiceModel.OperationContextScope(context))
        {
            result = InnerOperationInvoker.Invoke(instance, inputs, out staOutputs);
        }
     }));