WF4.0 基础篇 (二十一) WorkflowInvoker

 

本节主要介绍WF4 中 WorkflowInvoker的使用

本文例子下载:

https://files.cnblogs.com/foundation/WorkflowInvokerSample.rar

 

本文例子说明

 

 

WorkflowInvoker

类名

System.Activitys.WorkflowInvoker

文件

System.Activities.dll

结构说明

继承 Object

是一个 sealed类

override 了 [CacheMetadata方法] 与 [Execute方法]

功能说明

WorkflowApplication与WorkflowInvoker在调用流程上的区别

在WF4.0中,可以使用WorkflowApplication与WorkflowInvoker创建并启动实例.

但两者在宿主中的线程方式是不一样的

 

使用WorkflowInvoker启动工作流时,工作流将附加到宿主的线程中执行

使用WorkflowApplication启动工作流，工作流实例将在宿主线程之外的另一个线程中运行,使用的是线程池方式

 

具体见[Delay 与WF4中的线程]

 

WorkflowInvoker静态方式

public static TResult Invoke<TResult>(Activity<TResult> workflow);

 

public static IDictionary<string, object> Invoke(Activity workflow);

 

public static TResult Invoke<TResult>(Activity<TResult> workflow, IDictionary<string, object> inputs);

 

public static IDictionary<string, object> Invoke(Activity workflow, IDictionary<string, object> inputs);

 

public static IDictionary<string, object> Invoke(Activity workflow, TimeSpan timeout);

 

public static TResult Invoke<TResult>(Activity<TResult> workflow, IDictionary<string, object> inputs, TimeSpan timeout);

 

public static IDictionary<string, object> Invoke(Activity workflow, IDictionary<string, object> inputs, TimeSpan timeout);

 

public static TResult Invoke<TResult>(Activity<TResult> workflow, IDictionary<string, object> inputs, out IDictionary<string, object> additionalOutputs, TimeSpan timeout);

 

例:得到有返回值Activity的返回值

流程

public sealed class addActivity :NativeActivity<int>

{

public InArgument<int> X { get; set; }

public InArgument<int> Y { get; set; }

 

protected override void Execute(NativeActivityContext context)

{

int x = X.Get(context);

int y = Y.Get(context);

 

context.SetValue(base.Result, x + y);

}

}

调用

static void staticCallActivityResult()

{

var p = new System.Collections.Generic.Dictionary<string, object> { { "X", 1 }, { "Y", 2 } };

 

int result = WorkflowInvoker.Invoke(new addActivity(), p);

 

System.Console.WriteLine(result);

 

}

结果

 

 

例:得到OutArgument

流程

调用

static void staticCallOutArgument()

{

var p = new System.Collections.Generic.Dictionary<string, object> { { "X", 3 }, { "Y", 4 } };

 

System.Collections.Generic.IDictionary<string, object> outArgument = WorkflowInvoker.Invoke(new testWorkflow(), p);

 

foreach (var item in outArgument)

{

System.Console.WriteLine(item);

}

 

}

结果

 

例:得到OutArgument与有返回值Activity的返回值

流程

public sealed class resultAndOutArgumentActivity : NativeActivity<int>

{

public InArgument<int> X { get; set; }

public InArgument<int> Y { get; set; }

public OutArgument<int> myValue { set; get; }

protected override void Execute(NativeActivityContext context)

{

int x = X.Get(context);

int y = Y.Get(context);

 

context.SetValue(base.Result, x + y);

context.SetValue(myValue, x + y);

}

}

调用

static void staticCallResultAndOutArgument()

{

var p = new System.Collections.Generic.Dictionary<string, object> { { "X", 5 }, { "Y", 6 } };

 

System.Collections.Generic.IDictionary<string, object> outArgument;

int result = WorkflowInvoker.Invoke(new resultAndOutArgumentActivity(), p,out outArgument,new TimeSpan(0));

 

System.Console.WriteLine(result);

 

foreach (var item in outArgument)

{

System.Console.WriteLine(item);

}

 

}

结果

 

 

 

 

 

WorkflowInvoker实例方式

WorkflowInvoker实例方式调用工作流时,有返回值Activity的返回值与OutArgument都由 System.Collections.Generic.Dictionary<string, object>集合返回

 

 

例:得到有返回值Activity的返回值

流程

public sealed class addActivity :NativeActivity<int>

{

public InArgument<int> X { get; set; }

public InArgument<int> Y { get; set; }

 

protected override void Execute(NativeActivityContext context)

{

int x = X.Get(context);

int y = Y.Get(context);

 

context.SetValue(base.Result, x + y);

}

}

调用

static void callActivityResult()

{

var p = new System.Collections.Generic.Dictionary<string, object> { { "X", 7 }, { "Y", 8 } };

 

WorkflowInvoker invoker = new WorkflowInvoker(new addActivity());

System.Collections.Generic.IDictionary<string, object> result = invoker.Invoke(p);

 

foreach (var item in result)

{

System.Console.WriteLine(item);

}

 

}

结果

 

 

例:得到OutArgument

流程

调用

static void callOutArgument()

{

var p = new System.Collections.Generic.Dictionary<string, object> { { "X", 9 }, { "Y", 10 } };

 

WorkflowInvoker invoker = new WorkflowInvoker(new testWorkflow());

 

System.Collections.Generic.IDictionary<string, object> outArgument = invoker.Invoke(p);

 

foreach (var item in outArgument)

{

System.Console.WriteLine(item);

}

}

结果

 

例:得到OutArgument与有返回值Activity的返回值

流程

public sealed class resultAndOutArgumentActivity : NativeActivity<int>

{

public InArgument<int> X { get; set; }

public InArgument<int> Y { get; set; }

public OutArgument<int> myValue { set; get; }

protected override void Execute(NativeActivityContext context)

{

int x = X.Get(context);

int y = Y.Get(context);

 

context.SetValue(base.Result, x + y);

context.SetValue(myValue, x + y);

}

}

调用

static void callResultAndOutArgument()

{

var p = new System.Collections.Generic.Dictionary<string, object> { { "X", 11 }, { "Y", 12 } };

 

WorkflowInvoker invoker = new WorkflowInvoker(new resultAndOutArgumentActivity());

 

System.Collections.Generic.IDictionary<string, object> outArgument;

 

outArgument = invoker.Invoke(p);

 

foreach (var item in outArgument)

{

System.Console.WriteLine(item);

}

 

}

结果

 

例:InvokeAsync方法与invokeCompleted事件

流程

public sealed class resultAndOutArgumentActivity : NativeActivity<int>

{

public InArgument<int> X { get; set; }

public InArgument<int> Y { get; set; }

public OutArgument<int> myValue { set; get; }

protected override void Execute(NativeActivityContext context)

{

int x = X.Get(context);

int y = Y.Get(context);

 

context.SetValue(base.Result, x + y);

context.SetValue(myValue, x + y);

}

}

调用

#region //async

static void async()

{

WorkflowInvoker myInvoker = new WorkflowInvoker(new resultAndOutArgumentActivity());

 

var p = new System.Collections.Generic.Dictionary<string, object> { { "X", 13 }, { "Y", 14 } };

 

myInvoker.InvokeCompleted += new EventHandler<InvokeCompletedEventArgs>(myInvoker_InvokeCompleted);

 

myInvoker.InvokeAsync(p);

 

}

 

static void myInvoker_InvokeCompleted(object sender, InvokeCompletedEventArgs e)

{

foreach (var item in e.Outputs)

{

System.Console.WriteLine(item);

}

}

#endregion

结果

 

例:BeginInvoke方法与EndInvoke方法

流程

public sealed class resultAndOutArgumentActivity : NativeActivity<int>

{

public InArgument<int> X { get; set; }

public InArgument<int> Y { get; set; }

public OutArgument<int> myValue { set; get; }

protected override void Execute(NativeActivityContext context)

{

int x = X.Get(context);

int y = Y.Get(context);

 

context.SetValue(base.Result, x + y);

context.SetValue(myValue, x + y);

}

}

调用

 

#region //begion end

static void beginEnd()

{

WorkflowInvoker myInvoker = new WorkflowInvoker(new resultAndOutArgumentActivity());

 

var p = new System.Collections.Generic.Dictionary<string, object> { { "X", 15 }, { "Y", 16 } };

 

IAsyncResult ir = myInvoker.BeginInvoke(p, new AsyncCallback(callback), myInvoker);

 

System.Collections.Generic.IDictionary<string, object> outArgument = myInvoker.EndInvoke(ir);

 

foreach (var item in outArgument)

{

System.Console.WriteLine(item);

}

 

}

static void callback(IAsyncResult asyncResult)

{

System.Threading.ManualResetEvent mr = asyncResult.AsyncWaitHandle as System.Threading.ManualResetEvent;

 

System.Console.WriteLine("callback");

}

 

#endregion

结果

 

例:使用跟踪

// WorkflowInvoker invoker = new WorkflowInvoker(new testWorkflow());

 

// invoker.Extensions.Add(myTracking);

 

// invoker.Invoke();

具体见[Tracking 跟踪]

 

posted @ 2010-01-27 12:41  WXWinter(冬)  阅读(6172)  评论(7)  编辑  收藏  举报