WWF(1)
外部事件触发和处理：
1. 创建一个HandleExternalEventActivity
View Code
1 public class HandleEventActivity:HandleExternalEventActivity
2 {
3 public HandleEventActivity()
4 : base()
5 {
6 this.EventName = "HandleEvent";
7 this.InterfaceType = typeof(ITriggerEventService);
8 this.Name = "HandleEventActivity";
9 }
10
11 }
2. 创建一些类：
View Code
1 [ExternalDataExchange]
2 public interface ITriggerEventService
3 {
4 void triggerEvent(Guid instanceId);
5
6 event EventHandler<TriggerEventArgs> HandleEvent;
7 }
8
9 [Serializable]
10 public class TriggerEventArgs : ExternalDataEventArgs
11 {
12 public TriggerEventArgs(Guid instanceId)
13 : base(instanceId)
14 { }
15 }
16
17 [Serializable]
18 public class TriggerEventService : ITriggerEventService
19 {
20 #region ITriggerEventService Member
21
22 public void triggerEvent(Guid instanceId)
23 {
24 TriggerEventArgs teArgs = new TriggerEventArgs(instanceId);
25 EventHandler<TriggerEventArgs> evt = this.HandleEvent;
26 if (evt != null)
27 {
28 evt(this, teArgs);
29 }
30 }
31
32 public event EventHandler<TriggerEventArgs> HandleEvent;
33
34 #endregion
35 }
3. 创建TriggerEventActivity：
创建一个custom activity. 里面放一个名叫callExternalMethodActivity的CallExternalMethodActivity。
View Code
1 [Designer(typeof(ActivityDesigner))]
2 public partial class TriggerEventActivity : SequenceActivity
3 {
4 public TriggerEventActivity()
5 {
6 InitializeComponent();
7 }
8
9 protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
10 {
11 ExternalDataExchangeService edeService = executionContext.GetService(typeof(ExternalDataExchangeService)) as ExternalDataExchangeService;
12 if (edeService.GetService(typeof(TriggerEventService)) == null)
13 {
14 TriggerEventService teService = new TriggerEventService();
15 edeService.AddService(teService);
16 }
17 this.callExternalMethodActivity.ParameterBindings.GetItem("instanceId").Value = this.WorkflowInstanceId;
18 return base.Execute(executionContext);
19 }
20
21 public static DependencyProperty MethodInvokingEvent = DependencyProperty.Register("MethodInvoking", typeof(System.EventHandler), typeof(TriggerEventActivity));
22
23 [DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
24 [BrowsableAttribute(true)]
25 [CategoryAttribute("Execute Method")]
26 public event EventHandler MethodInvoking
27 {
28 add
29 {
30 base.AddHandler(MethodInvokingEvent, value);
31 }
32 remove
33 {
34 base.RemoveHandler(MethodInvokingEvent, value);
35 }
36 }
37 }
