Question

我在vb.net中创建了一个非常简单的状态机类库项目。这只有3个状态 - CreateApplication，ProcessApplication和CompleteApplication。我在同一个项目中创建了一个接口。我通过调用ApplicationService.CreateApplication（ApplicationDetail的obj）从Web应用程序调用它。

 <ExternalDataExchange()> _
    Public Interface IApplicationService
        Event ApplicationCreated As EventHandler(Of ApplicationDetailEventArgs)
        Event ApplicationProcessed As EventHandler(Of ApplicationDetailEventArgs)
    End Interface

我在ApplicationService.vb

中也有它的实现

 Public Class ApplicationService
        Implements IApplicationService

        Public Event ApplicationCreated(ByVal sender As Object, ByVal e As ApplicationDetailEventArgs) Implements IApplicationService.ApplicationCreated

        Public Event ApplicationProcessed(ByVal sender As Object, ByVal e As ApplicationDetailEventArgs) Implements IApplicationService.ApplicationProcessed

        Public Shared Sub CreateApplication(ByVal objApplicationDetail As ApplicationDetail)
            Using workflowRuntime As New WorkflowRuntime()
                AddHandler workflowRuntime.WorkflowCompleted, AddressOf OnWorkflowCompleted
                AddHandler workflowRuntime.WorkflowTerminated, AddressOf OnWorkflowTerminated

                Dim workflowInstance As WorkflowInstance
                workflowInstance = workflowRuntime.CreateWorkflow(GetType(Workflow1))
                workflowInstance.Start()
            End Using
            'Code to create application
        End Sub

        Shared Sub OnWorkflowCompleted(ByVal sender As Object, ByVal e As WorkflowCompletedEventArgs)
        End Sub

        Shared Sub OnWorkflowTerminated(ByVal sender As Object, ByVal e As WorkflowTerminatedEventArgs)
        End Sub

    End Class

我的问题是，当我尝试运行它时，我获得了workflowInstance的价值。 InstanceId为空。

自从过去两天以来，我一直试图解决这个问题。有人可以帮忙。

提前致谢！

Answer 1

嗯......我能够弄清楚问题是什么。它与工作流程无关。这是Visual Studio（2005和2008）中的一个错误。当您在VB.Net中调试时，Guid的值显示为空，但如果您使用Guid.ToString ..它工作正常。这在C＃中可以正常工作。

状态机工作流程 - VB.NET

1 个答案: