复式 WCF + COM 对象的静态集合
我正在尝试构建一个 WCF 服务,该服务公开我没有原始源代码的特定 COM 对象的功能。我使用双工绑定,以便每个客户端都有自己的实例,因为每个特定实例都有绑定的事件,这些事件是通过回调(IAgent)传递的。似乎存在死锁或其他原因,因为在第一个操作之后,我的服务在第二个操作的锁定处阻塞。我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始终为空。非常感谢任何建议。
服务
集合:
private static Dictionary<IAgent, COMAgent> agents = new Dictionary<IAgent, COMAgent>();
第一个操作:
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);
}
}
}
第二个操作:
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);
}
}
}
I am trying to build a WCF service that exposes the functionality of a particular COM object that I do not have the original source for. I am using duplex binding so that each client has their own instance as there are events tied to each particular instance which are delivered through a callback (IAgent). It appears there is a deadlock or something because after the first action, my service blocks at my second action's lock. I have tried implementing these custom STA attribute and operation behaviors (http://devlicio.us/blogs/scott_seely/archive/2009/07/17/calling-an-sta-com-object-from-a-wcf-operation.aspx) but my OperationContext.Current is always null. Any advice is much appreciated.
Service
Collection:
private static Dictionary<IAgent, COMAgent> agents = new Dictionary<IAgent, COMAgent>();
First action:
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);
}
}
}
Second Action:
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);
}
}
}
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看一下这个非常相似的帖子:http:// www.netfxharmonics.com/2009/07/Accessing-WPF-Generate-Images-Via-WCF
您必须使用OperationContextScope才能从新生成的线程访问当前的OperationContext:
Take a look at this very similar post: http://www.netfxharmonics.com/2009/07/Accessing-WPF-Generated-Images-Via-WCF
You have to use an OperationContextScope to have access to the current OperationContext from the newly generated thread: