WF4.0 基础篇 (二十九) WorkflowInspectionServices

本文例子下载:

http://files.cnblogs.com/foundation/WorkflowInspectionServicesSample.rar

 

WorkflowInspectionServices 类

WorkflowInspectionServices可以得到流程中的Activity，

由于WF4.0的ActivityTree相对复杂,并不是象WF3.X的结构那样清晰,

在WF4.0中Activitys,Body,Implementation等了Activity属性比效多,要循环Activity就要做很多判断,这时可以使用WorkflowInspectionServices得到ActivityTree上的所有Activity.

WorkflowInspectionServices可自动判断Activitys,Body,Implementation等

 

与自已实现递归相比,自已实现递归可以操作更多细节,WorkflowInspectionServices则可以快速得到全部Activity

 

 

 

注意:由于WorkflowInspectionServices只得到Activity,所以流程图中的

• FlowNode
• FlowStep
• FlowSwitch
• FlowDecision

不是从Activity中继承的,所以WorkflowInspectionServices无法得到这些元素,但这些元素中所包含的Activity可以得到

 

 

静态方法 GetActivities 

基本功能

基于XAML文件名得到Activity		static Activity getActivity(string filePathName)         {   string valueString = "";   using (System.IO.FileStream fileStream = new System.IO.FileStream(filePathName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read))             { using (System.IO.StreamReader streamReader = new System.IO.StreamReader(fileStream))                 {                     valueString = streamReader.ReadToEnd();                 }             }               System.IO.StringReader stringReader = new System.IO.StringReader(valueString);   Activity activity = System.Activities.XamlIntegration.ActivityXamlServices.Load(stringReader);   WorkflowInspectionServices.CacheMetadata(activity);   return activity;             }
GetActivities方式	static void printActivityTree(Activity activity,string tag)         {   Console.WriteLine(tag + "{0},type:{1}",  activity.DisplayName, activity.GetType());                 System.Collections.Generic.IEnumerator<Activity> list =  WorkflowInspectionServices.GetActivities(activity).GetEnumerator();   while (list.MoveNext())             {                 printActivityTree(list.Current,"  "+ tag );             }         }
递归方式	static void printActivityStruce(Activity activity, string tag)         {               System.Console.WriteLine(tag + "{0},Type:{1}", activity.DisplayName, activity.GetType());   //如果是表达式 VisualBasicValue<string> a = activity as VisualBasicValue<string>;   if (a != null)             {                 System.Console.WriteLine(tag + a.ExpressionText);             }       //如果是[DynamicActivity] DynamicActivity dynamicActivity = activity as DynamicActivity; if (dynamicActivity != null)             {                 System.Console.WriteLine(tag + "  Properties:"); foreach (var item in dynamicActivity.Properties)                 {                     System.Console.WriteLine(tag + "       Name:{0}, Type:{1}", item.Name, item.Type);                 }                     System.Console.WriteLine(tag + "  Implementation:");                   tag = tag + "     ";                 printActivityStruce(dynamicActivity.Implementation(), tag);             }     //如果是[Sequence] Sequence sequence = activity as Sequence; if (sequence != null)             {                 System.Console.WriteLine(tag + "  Variables :"); foreach (var item in sequence.Variables)                 {                     System.Console.WriteLine(tag + "       Name:{0}, Type:{1}, Default:{2}", item.Name, item.Type, item.Default);                 }                     System.Console.WriteLine(tag + "  Activities:"); foreach (var item in sequence.Activities)                 {                     tag = tag + "     ";                     printActivityStruce(item, tag);                 }             }             }

 

例子1:Sequence嵌套

static void showTestAWorkflow()         { Activity wf = getActivity("testAWorkflow.xaml");             printActivityTree(wf, "");               System.Console.WriteLine("=======================");             printActivityStruce(wf, "");         }

 

例子2:IF容器

static void showTestBWorkflow()         { Activity wf = getActivity("testBWorkflow.xaml");             printActivityTree(wf, "");               System.Console.WriteLine("=======================");             printActivityStruce(wf, "");                       }

 

例子3:FlowChar

static void showTestCWorkflow()         { Activity wf = getActivity("testCWorkflow.xaml");             printActivityTree(wf, "");               System.Console.WriteLine("=======================");             printActivityStruce(wf, "");         }

 

例子4:自定义Activity

static void showTestDWorkflow()         { Activity wf = getActivity("testDWorkflow.xaml");             printActivityTree(wf, "");               System.Console.WriteLine("=======================");             printActivityStruce(wf, "");         }

public sealed class muActivity : Activity     { protected override Func<Activity> Implementation         { get             { return getActivity;             } set             { base.Implementation = value;             }         }   Activity getActivity()         { return new WriteLine { DisplayName = "wxwinter" };         }     }

 

 

 

 

操作WCF服务中的工作流

xamlx文件中的工作流，可以用XamlServices.Load得到WorkflowService，WorkflowService的Body就对应WCF服务中的Activity树

FileStream fs = new FileStream("Service1.xamlx", FileMode.Open); WorkflowService wfs = (WorkflowService)XamlServices.Load(fs);   printActivityTree(wf,"|--");

 

 

 

静态方法 Resolve 

返回流程树中指定id的Activity 

static void printActivityID(Activity activity, string tag)         {   Console.WriteLine(tag + "{0},{1}", activity.Id, activity.DisplayName);                 System.Collections.Generic.IEnumerator<Activity> list = WorkflowInspectionServices.GetActivities(activity).GetEnumerator();   while (list.MoveNext())             {                 printActivityID(list.Current, "  " + tag);             }         }   static void findActivityByID()         { Activity wf = getActivity("testAWorkflow.xaml");             printActivityID(wf, "");             System.Console.WriteLine("=======================");   Activity act= WorkflowInspectionServices.Resolve(wf, "1.5"); Console.WriteLine("{0},{1}", act.Id, act.DisplayName);         }

 

 

 

静态方法 CacheMetadata 

CacheMetadata 方法用于验证Activity,如果验证不通过会产生异常,所以应该放入TryCatch中

 

Activity	public sealed class myActivityA : CodeActivity     {   public InArgument<string> myText { get; set; }     protected override void CacheMetadata(CodeActivityMetadata metadata)         {             myText = new VisualBasicValue<string> { ExpressionText = "myIn" }; base.CacheMetadata(metadata);         }   protected override void Execute(CodeActivityContext context)         {     string text = context.GetValue(this.myText);               System.Console.WriteLine("myActivityA:" + text);         }     }
	static void testCacheMetadata()        { try            {                System.Console.WriteLine("验证 myActivityA"); WorkflowInspectionServices.CacheMetadata(new myActivityA());                System.Console.WriteLine("验证 myActivityA 通过");            } catch(System.Exception ex)            {                System.Console.WriteLine(ex.Message);            }              System.Console.WriteLine("/====================================================================");   DynamicActivity dynamicActivity = new DynamicActivity();                         dynamicActivity.Properties.Add(new DynamicActivityProperty                                             {                                                 Name = "myIn",                                                 Type = typeof(InArgument<string>),                                                 Value = new InArgument<string>()                                             });                 dynamicActivity.Implementation =()=>new myActivityA();                  try            {                System.Console.WriteLine("验证 dynamicActivity"); WorkflowInspectionServices.CacheMetadata(dynamicActivity);                System.Console.WriteLine("验证 dynamicActivity 通ª过");            } catch (System.Exception ex)            {                System.Console.WriteLine(ex.Message);            }        }