最近,我开始在我的工作流应用程序中遇到这个异常。
System.Runtime.CallbackException,System.Runtime.DurableInstancing,版本=4.0.0.0,文化=中性,PublicKeyToken=31bf3856ad364e35
用户回调引发了异常。检查异常堆栈和内部异常以确定失败的回调。
我通过运行以下类的 Windows 服务托管我的服务:
public class WorkflowHost
{
private readonly List<string> _services = new List<string>();
private readonly Dictionary<string, WorkflowServiceHost> _hosts = new Dictionary<string, WorkflowServiceHost>();
public WorkflowHost(IList<string> serviceNames)
{
foreach (string serviceName in serviceNames)
{
_services.Add(serviceName);
}
}
public void Start()
{
if (_hosts.Count > 0)
{
Stop();
}
foreach(string serviceName in _services)
{
WorkflowService service = LoadService(serviceName);
WorkflowServiceHost host = new WorkflowServiceHost(service);
host.Faulted += new EventHandler(host_Faulted);
try
{
host.Open();
}
catch (Exception e)
{
Debug.WriteLine(e.Message);
}
_hosts.Add(serviceName, host);
}
}
void host_Faulted(object sender, EventArgs e)
{
Debug.WriteLine("Service Faulted");
Start();
}
public void Stop()
{
if (_hosts.Count > 0)
{
foreach (string serviceName in _services)
{
IDisposable host = _hosts[serviceName];
host.Dispose();
}
_hosts.Clear();
}
}
private WorkflowService LoadService(String xamlxName)
{
string fullFilePath = Path.Combine(@"..\..\..\Services\Sales Funnel Workflow", xamlxName);
WorkflowService service = XamlServices.Load(fullFilePath) as WorkflowService;
if (service != null)
{
return service;
}
else
{
throw new NullReferenceException(string.Format("Unable to load service definition from {0}", fullFilePath));
}
}
}
这是异常的完整堆栈跟踪:
<StackTrace>
at System.ServiceModel.Channels.CommunicationObject.OnFaulted()
at System.ServiceModel.Channels.CommunicationObject.Fault()
at System.ServiceModel.Channels.CommunicationObject.Fault(Exception exception)
at System.ServiceModel.Activities.Dispatcher.DurableInstanceManager.WaitAndHandleStoreEventsCallback(IAsyncResult result)
at System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
at System.Runtime.AsyncResult.AsyncCompletionWrapperCallback(IAsyncResult result)
at System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
at System.Runtime.DurableInstancing.InstanceHandle.WaitForEventsAsyncResult.Canceled()
at System.Runtime.DurableInstancing.InstanceHandle.Free()
at System.Activities.DurableInstancing.SqlWorkflowInstanceStoreLock.MarkInstanceOwnerLost(Int64 surrogateLockOwnerId)
at System.Activities.DurableInstancing.SqlWorkflowInstanceStoreLock.MarkInstanceOwnerLost(Int64 surrogateLockOwnerId, Boolean hasModificationLock)
at System.Activities.DurableInstancing.LockRenewalTask.HandleError(Exception exception)
at System.Activities.DurableInstancing.PersistenceTask.CommandCompletedCallback(IAsyncResult result)
at System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously, Exception exception)
at System.Activities.DurableInstancing.SqlWorkflowInstanceStoreAsyncResult.StartOperation()
at System.Activities.DurableInstancing.SqlWorkflowInstanceStoreAsyncResult.StartOperationCallback(Object state)
at System.Runtime.ActionItem.DefaultActionItem.Invoke()
at System.Runtime.ActionItem.CallbackHelper.InvokeWithoutContext(Object state)
at System.Runtime.IOThreadScheduler.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
</StackTrace>
<ExceptionString>System.Runtime.CallbackException: A user callback threw an exception. Check the exception stack and inner exception to determine the callback that failed. ---> System.ServiceModel.CommunicationObjectFaultedException: The communication object, System.ServiceModel.Activities.WorkflowServiceHost, cannot be used for communication because it is in the Faulted state.
at System.ServiceModel.Channels.CommunicationObject.Close(TimeSpan timeout)
at System.ServiceModel.ServiceHostBase.System.IDisposable.Dispose()
at Zeller.SalesFunnel.WorkFlow.Service.WorkflowHost.Stop() in C:\Projects\TFS\Zeller Corp Toolkit\Main\Toolkit\Services\ZSalesFunnelService\Zeller.SalesFunnel.WorkFlow.Service\WorkflowHost.cs:line 67
at Zeller.SalesFunnel.WorkFlow.Service.WorkflowHost.Start() in C:\Projects\TFS\Zeller Corp Toolkit\Main\Toolkit\Services\ZSalesFunnelService\Zeller.SalesFunnel.WorkFlow.Service\WorkflowHost.cs:line 30
at Zeller.SalesFunnel.WorkFlow.Service.WorkflowHost.host_Faulted(Object sender, EventArgs e) in C:\Projects\TFS\Zeller Corp Toolkit\Main\Toolkit\Services\ZSalesFunnelService\Zeller.SalesFunnel.WorkFlow.Service\WorkflowHost.cs:line 57
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.ServiceModel.Channels.CommunicationObject.OnFaulted()
--- End of inner exception stack trace ---</ExceptionString>
<InnerException>
<ExceptionType>System.ServiceModel.CommunicationObjectFaultedException, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType>
<Message>The communication object, System.ServiceModel.Activities.WorkflowServiceHost, cannot be used for communication because it is in the Faulted state.</Message>
<StackTrace>
at System.ServiceModel.Channels.CommunicationObject.Close(TimeSpan timeout)
at System.ServiceModel.ServiceHostBase.System.IDisposable.Dispose()
at Zeller.SalesFunnel.WorkFlow.Service.WorkflowHost.Stop() in C:\Projects\TFS\Zeller Corp Toolkit\Main\Toolkit\Services\ZSalesFunnelService\Zeller.SalesFunnel.WorkFlow.Service\WorkflowHost.cs:line 67
at Zeller.SalesFunnel.WorkFlow.Service.WorkflowHost.Start() in C:\Projects\TFS\Zeller Corp Toolkit\Main\Toolkit\Services\ZSalesFunnelService\Zeller.SalesFunnel.WorkFlow.Service\WorkflowHost.cs:line 30
at Zeller.SalesFunnel.WorkFlow.Service.WorkflowHost.host_Faulted(Object sender, EventArgs e) in C:\Projects\TFS\Zeller Corp Toolkit\Main\Toolkit\Services\ZSalesFunnelService\Zeller.SalesFunnel.WorkFlow.Service\WorkflowHost.cs:line 57
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.ServiceModel.Channels.CommunicationObject.OnFaulted()
</StackTrace>
<ExceptionString>System.ServiceModel.CommunicationObjectFaultedException: The communication object, System.ServiceModel.Activities.WorkflowServiceHost, cannot be used for communication because it is in the Faulted state.
at System.ServiceModel.Channels.CommunicationObject.Close(TimeSpan timeout)
at System.ServiceModel.ServiceHostBase.System.IDisposable.Dispose()
at Zeller.SalesFunnel.WorkFlow.Service.WorkflowHost.Stop() in C:\Projects\TFS\Zeller Corp Toolkit\Main\Toolkit\Services\ZSalesFunnelService\Zeller.SalesFunnel.WorkFlow.Service\WorkflowHost.cs:line 67
at Zeller.SalesFunnel.WorkFlow.Service.WorkflowHost.Start() in C:\Projects\TFS\Zeller Corp Toolkit\Main\Toolkit\Services\ZSalesFunnelService\Zeller.SalesFunnel.WorkFlow.Service\WorkflowHost.cs:line 30
at Zeller.SalesFunnel.WorkFlow.Service.WorkflowHost.host_Faulted(Object sender, EventArgs e) in C:\Projects\TFS\Zeller Corp Toolkit\Main\Toolkit\Services\ZSalesFunnelService\Zeller.SalesFunnel.WorkFlow.Service\WorkflowHost.cs:line 57
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.ServiceModel.Channels.CommunicationObject.OnFaulted()</ExceptionString>
</InnerException>
</Exception>
有谁知道为什么我会得到这个?