通过AEC解读WF的核心原理(二)通过AEC调用添加到引擎中的服务对像

 

说明

TrackingService，PersistenceService，ExternalDataExchange等服务都是通过引擎的AddService方法添加的

 

可以在Activity中用ActivityExecutionContext的GetService方法得到WorkflowRuntime的AddService方法加载的外部对象

 

本例是一个将自定义对象通过引擎的AddService方法添加，自定义Activity在内部使用演示

 

例子下载:http://files.cnblogs.com/wxwinter/aec2.rar

例子

自定义功能类

public class wxdTest { public string Text { set; get; }   public void myTest(string v) { System.Console.WriteLine("一个外部实现:" + v); } }

 

自定义Activity

public class Activity1 : Activity { public string Text { set; get; }   protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext) { wxdTest obj = executionContext.GetService<wxdTest>(); obj.myTest(Text); this.Text = obj.Text; return base.Execute(executionContext); } }

 

测试用工作流

public class Workflow1 : SequentialWorkflowActivity { private CodeActivity codeActivity1; private Activity1 activity11;   [System.Diagnostics.DebuggerNonUserCode] private void InitializeComponent() { this.CanModifyActivities = true; this.codeActivity1 = new System.Workflow.Activities.CodeActivity(); this.activity11 = new wxwinterAecTest.Activity1(); // // codeActivity1 // this.codeActivity1.Name = "codeActivity1"; this.codeActivity1.ExecuteCode += new System.EventHandler(this.codeActivity1_ExecuteCode); // // activity11 // this.activity11.Name = "activity11"; this.activity11.Text = "wxd"; // // Workflow1 // this.Activities.Add(this.activity11); this.Activities.Add(this.codeActivity1); this.Name = "Workflow1"; this.CanModifyActivities = false; }   public Workflow1() { InitializeComponent(); }   private void codeActivity1_ExecuteCode(object sender, EventArgs e) { System.Console.WriteLine("内部打印:" + activity11.Text); } }

 

宿主

class Program { static void Main() { WorkflowRuntime workflowRuntime = new WorkflowRuntime(); wxdTest obj = new wxdTest(); obj.Text = "lzm";   workflowRuntime.AddService(obj);   workflowRuntime.WorkflowCompleted +=new EventHandler<WorkflowCompletedEventArgs>(workflowRuntime_WorkflowCompleted); workflowRuntime.WorkflowTerminated +=new EventHandler<WorkflowTerminatedEventArgs>(workflowRuntime_WorkflowTerminated); workflowRuntime.WorkflowIdled+=new EventHandler<WorkflowEventArgs>(workflowRuntime_WorkflowIdled); WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof(Workflow1)); instance.Start();   System.Console.Read(); }   static void workflowRuntime_WorkflowIdled(object sender, WorkflowEventArgs e) { System.Console.WriteLine("WorkflowIdled"); }   static void workflowRuntime_WorkflowTerminated(object sender, WorkflowTerminatedEventArgs e) { System.Console.WriteLine("Terminated" + e.Exception.Message); }   static void workflowRuntime_WorkflowCompleted(object sender, WorkflowCompletedEventArgs e) { System.Console.WriteLine("WorkflowCompleted"); }   }

 

运行结果

 

 

总结:

AEC为Activity访问加载到引擎中的服务提供了接口