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WF4.0 基础篇 (二十九) WorkflowInspectionServices

發布時間：2023/12/10 编程问答 29 豆豆

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本文例子下載:

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

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

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

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

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);

}

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" };

}

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,"|--");

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);

}

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

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);

}

轉載于:https://www.cnblogs.com/foundation/archive/2010/04/02/1702762.html

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