说明

　　Activity有两种。一种继承自System.Workflow.ComponentModel.Activity,另一种继承自System.Workflow.ComponentModel.CompositeActivity

　　CompositeActivity是可以有childActivity,

　　CompositeActivity通过AEC可以对childActivity的执行进行管理

　　本例演示了:

　　如何使用CompositeActivity执行ChildActivity，并在ChildActivity执行完成后将自已关闭

　　本例下载:

　　http://files.cnblogs.com/wxwinter/aec4.rar

　　本例涉及到如下内容:

　　ActivityExecutionContext.ExecuteActivity(childActivity) 方法

　　CompositeActivity调用ExecuteActivity方法执行ChildActivity

　　只的 ChildActivity处于Initialized状态时才能调用该方法

　　引擎会自动执行ChildActivity下面的所有ChildActivity

　　ActivityExecutionContext.CloseActivity() 方法

　　将当前执行的Activity切换到Closed状态

　　只有在生成的所有执行上下文 (CreateExecutionContext) 都已完成 (CompleteExecutionContext) 时,才能将Activity设置成Closed状态

　　只有在创建完成AEC后才能将Activity设置成Closed状态

　　只有所有ChildActivity都处于 Closed 或 Initialized 状态时，才能将Activity设置成Closed状态

　　Activity.Closed事件

　　在 Activity 完成执行时发生

　　Activity.EnabledActivities

　　Activities 的只读子集合

　　添加到Activities集合中，且Enabled 设为真的Activitie

　　取消(CancellationHandlerActivity)这类Activitie,为会出现在该集合中

　　Activity.RegisterForStatusChange

　　为状态更改事件注册指定的事件

　　Activity.UnregisterForStatusChange

　　注销状态更改事件的指定

　　ActivityExecutionStatus执行状态

　　IActivityEventListener<ActivityExecutionStatusChangedEventArgs>接口

　　监听事件的对象的接口,要实现OnEvent(发生订阅事件时的处理方法)

　　例1:AEC.ExecuteActivity方法执行childActivity 自定义Activity

public class Activity1 : SequenceActivity
{
public Activity1()
{
InitializeComponent();
}
　　
[System.Diagnostics.DebuggerNonUserCode]
private void InitializeComponent()
{
this.CanModifyActivities = true;
this.codeActivity2 = new System.Workflow.Activities.CodeActivity();
this.codeActivity1 = new System.Workflow.Activities.CodeActivity();
//
// codeActivity2
//
this.codeActivity2.Name = "codeActivity2";
this.codeActivity2.ExecuteCode += new System.EventHandler(this.codeActivity2_ExecuteCode);
//
// codeActivity1
//
this.codeActivity1.Name = "codeActivity1";
this.codeActivity1.ExecuteCode += new System.EventHandler(this.codeActivity1_ExecuteCode);
//
// Activity1
//
this.Activities.Add(this.codeActivity1);
this.Activities.Add(this.codeActivity2);
this.Name = "Activity1";
this.CanModifyActivities = false;
　　
}
　　
private CodeActivity codeActivity2;
private CodeActivity codeActivity1;
　　
protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
executionContext.ExecuteActivity(this.codeActivity2);
　　
executionContext.ExecuteActivity(this.codeActivity1);
　　
return ActivityExecutionStatus.Executing;
　　
}
　　
private void codeActivity1_ExecuteCode(object sender, EventArgs e)
{
System.Console.WriteLine("codeActivity1_ExecuteCode");
}
　　
private void codeActivity2_ExecuteCode(object sender, EventArgs e)
{
System.Console.WriteLine("codeActivity2_ExecuteCode");
}
}

　　测试用工作流

public class Workflow1: SequentialWorkflowActivity
　　{
private Activity1 activity11;
　　
　　　　public Workflow1()
　　　　{
　　　　　　InitializeComponent();
　　　　}
[System.Diagnostics.DebuggerNonUserCode]
private void InitializeComponent()
{
this.CanModifyActivities = true;
this.activity11 = new wxwinterAecTest.Activity1();
//
// activity11
//
this.activity11.Name = "activity11";
//
// Workflow1
//
this.Activities.Add(this.activity11);
this.Name = "Workflow1";
this.CanModifyActivities = false;
　　
}
　　}

　　宿主

class Program
{
static void Main()
{
WorkflowRuntime workflowRuntime = new WorkflowRuntime();
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

　　例2:Activity.Closed事件通知父容器执行完成 自定义Activity

public class Activity1 : SequenceActivity
{
public Activity1()
{
InitializeComponent();
}
　　
[System.Diagnostics.DebuggerNonUserCode]
private void InitializeComponent()
{
this.CanModifyActivities = true;
this.codeActivity2 = new System.Workflow.Activities.CodeActivity();
this.codeActivity1 = new System.Workflow.Activities.CodeActivity();
//
// codeActivity2
//
this.codeActivity2.Name = "codeActivity2";
this.codeActivity2.ExecuteCode += new System.EventHandler(this.codeActivity2_ExecuteCode);
//
// codeActivity1
//
this.codeActivity1.Name = "codeActivity1";
this.codeActivity1.ExecuteCode += new System.EventHandler(this.codeActivity1_ExecuteCode);
//
// Activity1
//
this.Activities.Add(this.codeActivity1);
this.Activities.Add(this.codeActivity2);
this.Name = "Activity1";
this.CanModifyActivities = false;
　　
}
　　
private CodeActivity codeActivity2;
private CodeActivity codeActivity1;
　　
protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
this.codeActivity2.Closed += new EventHandler<ActivityExecutionStatusChangedEventArgs>(codeActivity_Closed);
this.codeActivity1.Closed += new EventHandler<ActivityExecutionStatusChangedEventArgs>(codeActivity_Closed);
　　
executionContext.ExecuteActivity(this.codeActivity2);
executionContext.ExecuteActivity(this.codeActivity1);
　　
return ActivityExecutionStatus.Executing;
　　
}
　　
void codeActivity_Closed(object sender, ActivityExecutionStatusChangedEventArgs e)
{
e.Activity.Closed -= new EventHandler<ActivityExecutionStatusChangedEventArgs>(codeActivity_Closed);
　　
foreach (var v in this.EnabledActivities)
{
if (v.ExecutionStatus != ActivityExecutionStatus.Closed)
{
return;
}
}
　　
ActivityExecutionContext aec = sender as ActivityExecutionContext;
aec.CloseActivity();
}
　　
private void codeActivity1_ExecuteCode(object sender, EventArgs e)
{
System.Console.WriteLine("codeActivity1_ExecuteCode");
}
　　
private void codeActivity2_ExecuteCode(object sender, EventArgs e)
{
System.Console.WriteLine("codeActivity2_ExecuteCode");
}
}

　　运行结果

　　例3:IActivityEventListener<ActivityExecutionStatusChangedEventArgs>接口通知父容器执行完成 自定义Activity

public class Activity1 : SequenceActivity, IActivityEventListener<ActivityExecutionStatusChangedEventArgs>
{
public Activity1()
{
InitializeComponent();
}
　　
[System.Diagnostics.DebuggerNonUserCode]
private void InitializeComponent()
{
this.CanModifyActivities = true;
this.codeActivity2 = new System.Workflow.Activities.CodeActivity();
this.codeActivity1 = new System.Workflow.Activities.CodeActivity();
//
// codeActivity2
//
this.codeActivity2.Name = "codeActivity2";
this.codeActivity2.ExecuteCode += new System.EventHandler(this.codeActivity2_ExecuteCode);
//
// codeActivity1
//
this.codeActivity1.Name = "codeActivity1";
this.codeActivity1.ExecuteCode += new System.EventHandler(this.codeActivity1_ExecuteCode);
//
// Activity1
//
this.Activities.Add(this.codeActivity1);
this.Activities.Add(this.codeActivity2);
this.Name = "Activity1";
this.CanModifyActivities = false;
　　
}
　　
private CodeActivity codeActivity2;
private CodeActivity codeActivity1;
　　
protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
this.codeActivity1.RegisterForStatusChange(Activity.ClosedEvent, this);
this.codeActivity2.RegisterForStatusChange(Activity.ClosedEvent, this);
　　
executionContext.ExecuteActivity(this.codeActivity2);
executionContext.ExecuteActivity(this.codeActivity1);
　　
return ActivityExecutionStatus.Executing;
}
　　
private void codeActivity1_ExecuteCode(object sender, EventArgs e)
{
System.Console.WriteLine("codeActivity1_ExecuteCode");
}
　　
private void codeActivity2_ExecuteCode(object sender, EventArgs e)
{
System.Console.WriteLine("codeActivity2_ExecuteCode");
}
　　
void IActivityEventListener<ActivityExecutionStatusChangedEventArgs>.OnEvent(object sender, ActivityExecutionStatusChangedEventArgs e)
{
e.Activity.UnregisterForStatusChange(Activity.ClosedEvent, this);
foreach (var v in this.EnabledActivities)
{
if (v.ExecutionStatus != ActivityExecutionStatus.Closed)
{
return;
}
}
　　
ActivityExecutionContext aec = sender as ActivityExecutionContext;
aec.CloseActivity();
}
}

　　运行结果

　　Activity.RegisterForStatusChange

　　为状态更改事件注册指定的事件

　　Activity.UnregisterForStatusChange

　　注销状态更改事件的指定

　　ActivityExecutionStatus执行状态

　　IActivityEventListener<ActivityExecutionStatusChangedEventArgs>接口

　　监听事件的对象的接口,要实现OnEvent(发生订阅事件时的处理方法)

　　例1:AEC.ExecuteActivity方法执行childActivity 自定义Activity

public class Activity1 : SequenceActivity
{
public Activity1()
{
InitializeComponent();
}
　　
[System.Diagnostics.DebuggerNonUserCode]
private void InitializeComponent()
{
this.CanModifyActivities = true;
this.codeActivity2 = new System.Workflow.Activities.CodeActivity();
this.codeActivity1 = new System.Workflow.Activities.CodeActivity();
//
// codeActivity2
//
this.codeActivity2.Name = "codeActivity2";
this.codeActivity2.ExecuteCode += new System.EventHandler(this.codeActivity2_ExecuteCode);
//
// codeActivity1
//
this.codeActivity1.Name = "codeActivity1";
this.codeActivity1.ExecuteCode += new System.EventHandler(this.codeActivity1_ExecuteCode);
//
// Activity1
//
this.Activities.Add(this.codeActivity1);
this.Activities.Add(this.codeActivity2);
this.Name = "Activity1";
this.CanModifyActivities = false;
　　
}
　　
private CodeActivity codeActivity2;
private CodeActivity codeActivity1;
　　
protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
executionContext.ExecuteActivity(this.codeActivity2);
　　
executionContext.ExecuteActivity(this.codeActivity1);
　　
return ActivityExecutionStatus.Executing;
　　
}
　　
private void codeActivity1_ExecuteCode(object sender, EventArgs e)
{
System.Console.WriteLine("codeActivity1_ExecuteCode");
}
　　
private void codeActivity2_ExecuteCode(object sender, EventArgs e)
{
System.Console.WriteLine("codeActivity2_ExecuteCode");
}
}