WF in Asp.Net

这几天在研究Windows Workflow Foundation,天天上www.windowsworkflow.net 的论坛上查看和询问，全都是英文，头都看大了，对这金山词霸一个一个的啃。闲话少说，步入正题吧！

本篇主要讲WF在asp.net运用。如下：
我的流程设置如下：

设置了一个CodeActive和一个HandleExternalEventActive
CodeActive是执行一段代码的Active
HandleExternalEventActive是外联一个Event的Active

首先，配置web.config

简单介绍上面的配置文件
a.注册服务
这里是将一些服务注册到 Workruntime中，你也可以在代码中使用AddServcie中注册服务。
注册好服务后，就可以在代码中
ExternalDataExchangeService dataService = workflowRuntime.GetService<ExternalDataExchangeService>();
以上方式得到服务。
b.跟踪
配置跟踪信息，非常有用，我有一次调试的时候，MSDTC 服务没有启动的错误，就是查看WFTrace.log文件而获得的。

然后,在Global中启动一个WorkRunTime

void Application_Start(object sender, EventArgs e)

{

System.Workflow.Runtime.WorkflowRuntime workflowRuntime = new System.Workflow.Runtime.WorkflowRuntime("WorkflowRuntime");

Application["WorkflowRuntime"] = workflowRuntime;

System.Workflow.ComponentModel.Compiler.TypeProvider typeProvider = new System.Workflow.ComponentModel.Compiler.TypeProvider(workflowRuntime);

typeProvider.AddAssembly(typeof(WorkflowLibrary1.Workflow1).Assembly);

workflowRuntime.AddService(typeProvider);

workflowRuntime.StartRuntime();

}

void Application_End(object sender, EventArgs e)

{

System.Workflow.Runtime.WorkflowRuntime workflowRuntime = Application["WorkflowRuntime"] as System.Workflow.Runtime.WorkflowRuntime;

workflowRuntime.StopRuntime();

}

接着，就可以在程序中运行workflow了

private void StartWorkflow()

{

WorkflowRuntime workflowRuntime = StartRuntime();

// Now get a refernece to the ManualWorkflowSchedulerService

ManualWorkflowSchedulerService scheduler =

workflowRuntime.GetService<ManualWorkflowSchedulerService>();

// Attach to the WorkflowCompleted event

workflowRuntime.WorkflowCompleted += new EventHandler<WorkflowCompletedEventArgs>(WorkflowRuntime_WorkflowCompleted);

WorkflowInstance workflowInstance = workflowRuntime.CreateWorkflow(typeof(WorkflowLibrary1.Workflow1));

workflowInstance.Start();

// Now run the workflow. This is necessary when

using the ManualWorkflowSchedulerService

scheduler.RunWorkflow(workflowInstance.InstanceId);

}

private WorkflowRuntime StartRuntime()

{

WorkflowRuntime workflowRuntime = Application["WorkflowRuntime"] as WorkflowRuntime;

ExternalDataExchangeService dataService = workflowRuntime.GetService<ExternalDataExchangeService>();

OrderLocalServices.OrderService orderService = workflowRuntime.GetService<OrderLocalServices.OrderService>();

if (orderService == null)

{

orderService = new OrderLocalServices.OrderService();

dataService.AddService(orderService);

}

// Attach to the WorkflowCompleted event

workflowRuntime.WorkflowCompleted += new EventHandler<WorkflowCompletedEventArgs>(WorkflowRuntime_WorkflowCompleted);

return workflowRuntime;

}

最后，运行代码后，当运行完上图中的CodeActive后，该workflowinstance将进入等待状态（会触发workflowRuntinme的WorkflowIdled事件）。
这个时候你如果注册了SqlWorkflowPersistenceService服务，和创建了PersistenceStore数据库，则会将此
工作流保存到数据库中，已备下次使用，关于这块下次我再整理。
为什么工作流会等待了，
因为接下来的环节HandleExternalEventActive的Active必须需要触发了和他相关联的事件后，他才会继续的。
所以，我可以针对workflowRuntinme增加WorkflowIdled事件，实现事件的代码如下：

void workflowRuntime_WorkflowIdled(object sender, WorkflowEventArgs e)