Question

尝试使用以下代码恢复工作流时：

    public WorkflowApplication LoadInstance(Guid instanceId)
    {
        if (this.instances.ContainsKey(instanceId))
            return this.instances[instanceId];

        WorkflowApplication instance = new WorkflowApplication(new Tarpon.Workflows.CreateContact());

        //  Create Persistable Workflow           
        SqlWorkflowInstanceStore store = new SqlWorkflowInstanceStore(ConfigurationManager.ConnectionStrings["WorkflowPersistance"].ConnectionString);
        store.HostLockRenewalPeriod = new TimeSpan(0, 0, 5);
        instance.InstanceStore = store;

        //  Load Instance
        instance.Completed += OnWorkflowCompleted;
        instance.Idle += OnIdle;
        instance.PersistableIdle += OnIdleAndPersistable;
        instance.Aborted += OnAborted;
        instance.Load(instanceId);

        //  Save instance in list of running instances
        this.instances.Add(instance.Id, instance);       // ERROR IS THROWN HERE

        return instance;
    }

我在“ this.instances.Add（instance.Id，instance）”行上得到错误：

The execution of an InstancePersistenceCommand was interrupted because the instance '9b9430b6-f182-469d-bcae-0886d546f7ea' is locked by a different instance owner. 
This error usually occurs because a different host has the instance loaded. The instance owner ID of the owner or host with a lock on the instance is '30411662-b9b3-4250-9e2c-5aaa9895b740'.

我试图在上面的代码中降低HostLockRenewalPeriod，并且还添加了下面的代码以希望在实例上禁用锁定但无济于事。它似乎也从未打破下面的代码。每次我越过Load（）方法，我都会遇到上述错误。

    public PersistableIdleAction OnIdleAndPersistable(WorkflowApplicationIdleEventArgs e)
    {
        instances.Remove(e.InstanceId);
        return PersistableIdleAction.Unload;
    }

看起来这段代码的工作时间有一半，但另一半却没有正确恢复它的工作流程。有没有人知道我可以做些什么来正确地删除锁，而不必重新编写所有这些功能？

Answer 1

请查看描述持久性和instaneStore配置的this blog post。

此代码是从帖子中复制的，我认为它可能对您有所帮助：“

var instanceStore = new SqlWorkflowInstanceStore(connStr); 
var instanceHandle = instanceStore.CreateInstanceHandle();
var createOwnerCmd = new CreateWorkflowOwnerCommand();
var view = instanceStore.Execute(instanceHandle, createOwnerCmd, TimeSpan.FromSecond(30));
instanceStore.DefaultInstanceOwner = view.InstanceOwner; 
// Do whatever needs to be dome with multiple WorkflowApplications 
var deleteOwnerCmd = new    DeleteWorkflowOwnerCommand();
instanceStore.Execute(instanceHandle, deleteOwnerCmd, TimeSpan.FromSeconds(30));

关键是需要在开始时执行的CreateWorkflowOwnerCommand。当您使用CreateWorkflowOwnerCommand时，请确保不要忘记DeleteWorkflowOwnerCommand，否则所有工作流将由所有者保持锁定状态，并且不能由另一个SqlWorkflowInstanceStore重新加载

Answer 2

我在这里看不到instance.Run或instance.ResumeBookmark，并且你需要解决任何与执行相关的事件，例如PersistableIdle。

Answer 3

实际上，当我在开发中看到这个错误时，它只意味着我需要清理我的持久性数据库。您可以使用已存在的存储过程来删除持久工作流。

Answer 4

尝试制作WorkflowIdleBehavior对象并将其TimeToUnload设置为零。有关详细信息，请参阅here。

尝试恢复Windows工作流时出错

4 个答案: