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:
http://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]