说明

　　例子下载: http://files.cnblogs.com/wxwinter/aec7.rar

　　WF的工具栏里竞然没的Goto,SetState不算错

　　Goto好不好用是开发人员的问题，不提供就是平台的错了。

　　实现Goto不难，难的是限定Goto的规则，本例的Goto规则是可以跳到同级容器内的任意Activity处开始持行

　　本例是下个ACE和调度技巧演示，没的具体的业务场景

　　本例还演示控制Activity面板显示的技巧:Designer

　　例子

　　Goto的Designer

public class myDesigner : ActivityDesigner
{
Goto parentActivity;
　　
protected override void Initialize(Activity activity)
{
base.Initialize(activity);
parentActivity = (Goto)activity;
}
　　
//定义Activity的尺寸
protected override Size OnLayoutSize(ActivityDesignerLayoutEventArgs e)
{
return new Size(100, 80);
}
　　
//Activity的面板展现
protected override void OnPaint(ActivityDesignerPaintEventArgs e)
{
Rectangle 区域 = new Rectangle(this.Location.X, this.Location.Y, this.Size.Width, this.Size.Height);
GraphicsPath path = new GraphicsPath();
path.AddRectangle(区域);
Brush 笔刷 = new LinearGradientBrush(区域, Color.White, Color.LightGreen, 1);
e.Graphics.FillPath(笔刷, path);
e.Graphics.DrawRectangle(new Pen(Brushes.Black), 区域);
　　
string s = Activity.QualifiedName + "rn" + "rn";
s = s + "跳到:" + "rn";
s = s + parentActivity.要跳到的位置.Name + "rn";
e.Graphics.DrawString(s, new Font("宋体", 12), Brushes.Black, 区域);
}
}

　　Goto的Activity

[Designer(typeof(myDesigner), typeof(IDesigner))]
　　public class Goto: Activity
　　{
public Activity 要跳到的位置
{
get { return (Activity )GetValue(要跳到的位置Property); }
set { SetValue(要跳到的位置Property, value); }
}
　　
public static readonly DependencyProperty 要跳到的位置Property = DependencyProperty.Register("要跳到的位置", typeof(Activity ), typeof(Goto));
　　
public int 记数器
{
get { return (int)GetValue(记数器Property); }
set { SetValue(记数器Property, value); }
}
　　
public static readonly DependencyProperty 记数器Property =DependencyProperty.Register("记数器", typeof(int), typeof(Goto),new PropertyMetadata(1));
　　}

　　容器Activity

public class 容器: SequenceActivity
　　{
int index=0;
protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
ExecuteActivityItem(executionContext);
return ActivityExecutionStatus.Executing;
}
　　
private void ExecuteActivityItem(ActivityExecutionContext executionContext)
{
Activity activity = EnabledActivities[index];
　　
if (activity is Goto)
{
Goto p = this.GetActivityByName(activity.Name) as Goto;
　　
if (p.记数器 == 0)
{
index = index + 1;
ExecuteActivityItem(executionContext);
}
else
{
p.记数器 = p.记数器 - 1;
Goto tp = activity as Goto;
　　
index = this.EnabledActivities.IndexOf(tp.要跳到的位置);
ExecuteActivityItem(executionContext);
}
}
else
{
ActivityExecutionContext newContext = executionContext.ExecutionContextManager.CreateExecutionContext(activity);
newContext.Activity.Closed += activity_Closed;
newContext.ExecuteActivity(newContext.Activity);
}
}
　　
void activity_Closed(object sender, ActivityExecutionStatusChangedEventArgs e)
{
e.Activity.Closed -= activity_Closed;
index = index + 1;
ActivityExecutionContext aec = sender as ActivityExecutionContext;
ActivityExecutionContext childContext = aec.ExecutionContextManager.GetExecutionContext(e.Activity);
aec.ExecutionContextManager.CompleteExecutionContext(childContext);
if (index > this.EnabledActivities.Count - 1)
{
aec.CloseActivity();
}
else
{
ExecuteActivityItem(aec);
}
}
}

　　测试用工作流

　　public class Workflow1: SequentialWorkflowActivity

{
private CodeActivity codeActivity4;
private CodeActivity codeActivity3;
private CodeActivity codeActivity2;
private 容器 容器1;
private Goto goto1;
private CodeActivity codeActivity5;
private CodeActivity codeActivity1;
　　
　　　　public Workflow1()
　　　　{
　　　　　　InitializeComponent();
　　　　}
[System.Diagnostics.DebuggerNonUserCode]
private void InitializeComponent()
{
this.CanModifyActivities = true;
this.codeActivity5 = new System.Workflow.Activities.CodeActivity();
this.goto1 = new wxwinterAecTest.Goto();
this.codeActivity4 = new System.Workflow.Activities.CodeActivity();
this.codeActivity3 = new System.Workflow.Activities.CodeActivity();
this.codeActivity2 = new System.Workflow.Activities.CodeActivity();
this.codeActivity1 = new System.Workflow.Activities.CodeActivity();
this.容器1 = new wxwinterAecTest.容器();
//
// codeActivity5
//
this.codeActivity5.Name = "codeActivity5";
this.codeActivity5.ExecuteCode += new System.EventHandler(this.codeActivity_ExecuteCode);
//
// goto1
//
this.goto1.Name = "goto1";
this.goto1.要跳到的位置 = this.codeActivity2;
this.goto1.记数器 = 1;
//
// codeActivity4
//
this.codeActivity4.Name = "codeActivity4";
this.codeActivity4.ExecuteCode += new System.EventHandler(this.codeActivity_ExecuteCode);
//
// codeActivity3
//
this.codeActivity3.Name = "codeActivity3";
this.codeActivity3.ExecuteCode += new System.EventHandler(this.codeActivity_ExecuteCode);
//
// codeActivity2
//
this.codeActivity2.Name = "codeActivity2";
this.codeActivity2.ExecuteCode += new System.EventHandler(this.codeActivity_ExecuteCode);
//
// codeActivity1
//
this.codeActivity1.Name = "codeActivity1";
this.codeActivity1.ExecuteCode += new System.EventHandler(this.codeActivity_ExecuteCode);
//
// 容器1
//
this.容器1.Activities.Add(this.codeActivity1);
this.容器1.Activities.Add(this.codeActivity2);
this.容器1.Activities.Add(this.codeActivity3);
this.容器1.Activities.Add(this.codeActivity4);
this.容器1.Activities.Add(this.goto1);
this.容器1.Activities.Add(this.codeActivity5);
this.容器1.Name = "容器1";
//
// Workflow1
//
this.Activities.Add(this.容器1);
this.Name = "Workflow1";
this.CanModifyActivities = false;
}
　　
private void codeActivity_ExecuteCode(object sender, EventArgs e)
{
System.Console.WriteLine(((Activity)sender).Name);
}
　　}

　　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

　　Goto的Activity

[Designer(typeof(myDesigner), typeof(IDesigner))]
　　public class Goto: Activity
　　{
public Activity 要跳到的位置
{
get { return (Activity )GetValue(要跳到的位置Property); }
set { SetValue(要跳到的位置Property, value); }
}
　　
public static readonly DependencyProperty 要跳到的位置Property = DependencyProperty.Register("要跳到的位置", typeof(Activity ), typeof(Goto));
　　
public int 记数器
{
get { return (int)GetValue(记数器Property); }
set { SetValue(记数器Property, value); }
}
　　
public static readonly DependencyProperty 记数器Property =DependencyProperty.Register("记数器", typeof(int), typeof(Goto),new PropertyMetadata(1));
　　}

　　容器Activity

public class 容器: SequenceActivity
　　{
int index=0;
protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
ExecuteActivityItem(executionContext);
return ActivityExecutionStatus.Executing;
}
　　
private void ExecuteActivityItem(ActivityExecutionContext executionContext)
{
Activity activity = EnabledActivities[index];
　　
if (activity is Goto)
{
Goto p = this.GetActivityByName(activity.Name) as Goto;
　　
if (p.记数器 == 0)
{
index = index + 1;
ExecuteActivityItem(executionContext);
}
else
{
p.记数器 = p.记数器 - 1;
Goto tp = activity as Goto;
　　
index = this.EnabledActivities.IndexOf(tp.要跳到的位置);
ExecuteActivityItem(executionContext);
}
}
else
{
ActivityExecutionContext newContext = executionContext.ExecutionContextManager.CreateExecutionContext(activity);
newContext.Activity.Closed += activity_Closed;
newContext.ExecuteActivity(newContext.Activity);
}
}
　　
void activity_Closed(object sender, ActivityExecutionStatusChangedEventArgs e)
{
e.Activity.Closed -= activity_Closed;
index = index + 1;
ActivityExecutionContext aec = sender as ActivityExecutionContext;
ActivityExecutionContext childContext = aec.ExecutionContextManager.GetExecutionContext(e.Activity);
aec.ExecutionContextManager.CompleteExecutionContext(childContext);
if (index > this.EnabledActivities.Count - 1)
{
aec.CloseActivity();
}
else
{
ExecuteActivityItem(aec);
}
}
}