有关异步运行工作流应用程序的问题 [英] Question about running workflowapplication asynchronously

问题描述

我正在尝试在Workflow 4.0上进行练习-编写一个定制活动以异步执行子活动(如图表流或序列)(我起草的机制是动态创建工作流应用程序并调用活动已通过 中)，并将其托管在WCF工作流服务中，然后从网站使用它.但是我真的遇到了这个模型的一个奇怪的问题，当我第一次从网页上访问这个工作流时，一切看起来都很好，我可以让两个不同的线程正常工作 但是，通常，当我第二次单击页面按钮并触发工作流时，后台线程似乎根本无法工作，因为我在其上设置了调试点，并且无法访问这些调试点.我不知道为什么〜???我真的希望能对此有所启发 问题，等待您的答复.如果我错过了任何事情，请通知我添加.

I am trying practice on Workflow 4.0 - and write a custom activity which is intended to execute a child activity(like a chartflow or sequence) asynchronously(the mechanism I drafted is to create workflow application dynamically and invoke activity passed in), and host it in a WCF Workflow service and consume it from a web site. But I really met a strange issue for this model, when I access this workflow from a web page in the first time, the everything seems working fine, I can get 2 different threads working normally, however, when I click page button and trigger workflow 2nd time, the background thread seems not working at all, because I set debug point on it, and no access to these debug points. I don't know why~??? I really hope get some guidance on this weird question, waiting for your reply. If anything I missed, please notify me to add.

代码部分:

 

 [Designer(typeof(AsyncActivityWrapperDesigner))]
 public class AsyncActivityWrapper : AsyncCodeActivity<bool>
 {
 
 public Activity Body { get; set; }


 protected override void CacheMetadata(CodeActivityMetadata metadata)
 {
 metadata.GetArgumentsWithReflection();
 base.CacheMetadata(metadata);
 }
 AutoResetEvent completed;
 protected override IAsyncResult BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, object state)
 {
 GetArgumentsAndVariables(context);
 var extension = context.GetExtension<Extentions.MyExtention>();
 completed = new AutoResetEvent(false);

 WorkflowApplication app = new WorkflowApplication(Body);//body is passed in a flowchart or sequence activity for running asynchronously 
 app.Idle = (WorkflowApplicationIdleEventArgs eArgs) =>
 {
 Guid dui = eArgs.InstanceId;
 };

 app.Extensions.Add(extension);
 context.UserState = app;
 app.Completed = (WorkflowApplicationCompletedEventArgs eArgs) =>
 {

推荐答案

没有人可以回答这个问题吗?

no anyone can answer this?

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