WF4.0 基础篇 (二十九) WorkflowInspectionServices
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本文例子下載:
http://files.cnblogs.com/foundation/WorkflowInspectionServicesSample.rar
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WorkflowInspectionServices 類
WorkflowInspectionServices可以得到流程中的Activity，
由于WF4.0的ActivityTree相對復雜,并不是象WF3.X的結構那樣清晰,
在WF4.0中Activitys,Body,Implementation等了Activity屬性比效多,要循環Activity就要做很多判斷,這時可以使用WorkflowInspectionServices得到ActivityTree上的所有Activity.
WorkflowInspectionServices可自動判斷Activitys,Body,Implementation等
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與自已實現遞歸相比,自已實現遞歸可以操作更多細節,WorkflowInspectionServices則可以快速得到全部Activity
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注意:由于WorkflowInspectionServices只得到Activity,所以流程圖中的
- FlowNode
- FlowStep
- FlowSwitch
- FlowDecision
不是從Activity中繼承的,所以WorkflowInspectionServices無法得到這些元素,但這些元素中所包含的Activity可以得到
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靜態方法 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 ); } } | |
遞歸方式 | static void printActivityStruce(Activity activity, string tag) { ? System.Console.WriteLine(tag + "{0},Type:{1}", activity.DisplayName, activity.GetType()); ? //如果是表達式 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); } } ? ? } | |
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例子1:Sequence嵌套
static void showTestAWorkflow() { Activity wf = getActivity("testAWorkflow.xaml"); printActivityTree(wf, ""); ? System.Console.WriteLine("======================="); printActivityStruce(wf, ""); } |
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例子2:IF容器
static void showTestBWorkflow() { Activity wf = getActivity("testBWorkflow.xaml"); printActivityTree(wf, ""); ? System.Console.WriteLine("======================="); printActivityStruce(wf, ""); ? ? } |
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例子3:FlowChar
static void showTestCWorkflow() { Activity wf = getActivity("testCWorkflow.xaml"); printActivityTree(wf, ""); ? System.Console.WriteLine("======================="); printActivityStruce(wf, ""); } |
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例子4:自定義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" }; } } |
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操作WCF服務中的工作流
xamlx文件中的工作流，可以用XamlServices.Load得到WorkflowService，WorkflowService的Body就對應WCF服務中的Activity樹
FileStream fs = new FileStream("Service1.xamlx", FileMode.Open); WorkflowService wfs = (WorkflowService)XamlServices.Load(fs); ? printActivityTree(wf,"|--"); |
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靜態方法 Resolve
返回流程樹中指定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); } |
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靜態方法 CacheMetadata
CacheMetadata 方法用于驗證Activity,如果驗證不通過會產生異常,所以應該放入TryCatch中
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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("驗證 myActivityA"); WorkflowInspectionServices.CacheMetadata(new myActivityA()); System.Console.WriteLine("驗證 myActivityA 通過"); } 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("驗證 dynamicActivity"); WorkflowInspectionServices.CacheMetadata(dynamicActivity); System.Console.WriteLine("驗證 dynamicActivity 通a過"); } catch (System.Exception ex) { System.Console.WriteLine(ex.Message); } } |
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轉載于:https://www.cnblogs.com/foundation/archive/2010/04/02/1702762.html
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