通過AEC解讀WF的核心原理(二)通過AEC調用添加到引擎中的服務對像

 

說明

TrackingService，PersistenceService，ExternalDataExchange等服務都是通過引擎的AddService方法添加的

 

可以在Activity中用ActivityExecutionContext的GetService方法得到WorkflowRuntime的AddService方法載入的外部對象

 

本例是一個將自訂對象通過引擎的AddService方法添加，自訂Activity在內部使用示範

 

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

例子
自訂功能類

public class wxdTest { public string Text { set; get; }   public void myTest(string v) { System.Console.WriteLine("一個外部實現:" + v); } }

 

自訂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); } }

 

測試用工作流程

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("內部列印:" + 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"); }   }

 

運行結果

 

 

總結:

AEC為Activity訪問載入到引擎中的服務提供了介面