《WF in 24 Hours》读书笔记 - Hour 3(1) - Workflow：添加宿主和事件监听
1. 创建项目组，并添加一个Console Project和Activity Library，在Activity Library的项目中添加CodeActivity1和CodeActivity2，最终结构如下图所示：
2. CodeActivity1和2的代码如下：
1 public sealed class CodeActivity1 : CodeActivity 2 { 3 // Define an activity input argument of type string 4 public InArgument<string> Text { get; set; } 5 6 // If your activity returns a value, derive from CodeActivity<TResult> 7 // and return the value from the Execute method. 8 protected override void Execute(CodeActivityContext context) 9 { 10 Console.WriteLine("before delay: \'{0}\'", DateTime.Now.ToLongTimeString()); 11 } 12 } 13 14 public sealed class CodeActivity2 : CodeActivity 15 { 16 // Define an activity input argument of type string 17 public InArgument<string> Text { get; set; } 18 19 // If your activity returns a value, derive from CodeActivity<TResult> 20 // and return the value from the Execute method. 21 protected override void Execute(CodeActivityContext context) 22 { 23 Console.WriteLine("after delay: \'{0}\'", DateTime.Now.ToLongTimeString()); 24 } 25 }
3. 修改Activity1.xaml如下：
4. 修改Console Project的program.cs（注意，需要事先引入WorkflowsProject和System.Activities.dll）
1 static void Main(string[] args) 2 { 3 AutoResetEvent syncEvent = new AutoResetEvent(false); 4 5 Activity wf = new WorkflowsProject.Activity1(); 6 7 // Create the WorkflowApplication using the desired 8 // workflow definition. 9 WorkflowApplication wfApp = new WorkflowApplication(wf); 10 11 // Handle the desired lifecycle events. 12 wfApp.Completed = delegate(WorkflowApplicationCompletedEventArgs e) 13 { 14 Console.WriteLine("Workflow {0} completed.", e.InstanceId.ToString()); 15 syncEvent.Set(); 16 }; 17 18 wfApp.Aborted = delegate(WorkflowApplicationAbortedEventArgs e) 19 { 20 Console.WriteLine("Workflow {0} terminated because {1}", e.InstanceId, e.Reason.Message); 21 syncEvent.Set(); 22 }; 23 24 // Start the workflow. 25 wfApp.Run(); 26 27 // Wait for Completed to arrive and signal that 28 // the workflow is complete. 29 syncEvent.WaitOne(); 30 31 // Keep the console screen alive when workflow comnpletes 32 Console.WriteLine("Press enter to continue"); 33 Console.Read(); 34 }
5. 运行。结果如下：
总结：通过此例，我们可以看到通过WorkflowApplication，我们可以在宿主程序中启动Workflow，并且捕捉Workflow的事件。
