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)
{
WorkflowRuntime workflowRuntime = Application["WorkflowRuntime"] OrderService orderService = workflowRuntime.GetService<OrderService>(); WorkflowInstance instance = workflowRuntime.GetLoadedWorkflows()[0]; instance.Load(); //触发相关联的事件 orderService.RaiseOrderUpdatedEvent(instance.InstanceId);
}这样这个工作流就整个的执行完成了。