WF4.0 Beta1 變數 Variables

 

只有具備[Variables]屬性的Activity才可以定義變數

[Variables] 的資料類型為System.Collections.ObjectModel.Collection<System.Activities.Variable>

 

變數添加

在WF設計器中添加

 

變數存放在所在[Activity]的內部,

 

<p:Activity mc:Ignorable="" x:Class="WorkflowConsoleApplication3.Sequence1" xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities/design" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:p="http://schemas.microsoft.com/netfx/2009/xaml/activities" xmlns:sad="clr-namespace:System.Activities.Debugger;assembly=System.Activities" xmlns:w="clr-namespace:WorkflowConsoleApplication3;assembly=WorkflowConsoleApplication3" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <p:Sequence > <w:myElement> <w:myElement.Variables> <p:Variable x:TypeArguments="x:String" Default="[&quot;i am wxd&quot;]" Name="wxd" /> </w:myElement.Variables> </w:myElement> </p:Activity>

 

在定義變數的[Activity]內部的[Activity]可以訪問變數,在定義變數的[Activity]外部的[Activity]無法訪問變數

 

無法通過啟動傳參方式為[變數]賦值.無法在流程完成事件中接收[變數]的值

 

定義具有[Variables]屬性的Activity

自訂Activity	public class myNative :NativeActivity {   private Collection<Variable> variables; private Variable<int> lastIndexHint; public myNative() { this.variables = new WorkflowElement.DesignTimeAwareCollection<Variable>(this); this.lastIndexHint = new Variable<int> { Modifiers = VariableModifiers.SuppressTracking }; }   protected override void OnGetEnvironmentVariables(IList<Variable> variables) { for (int i = 0; i < this.Variables.Count; i++) { variables.Add(this.Variables[i]); } }   protected override void OnGetPrivateVariables(IList<Variable> variables) { variables.Add(this.lastIndexHint); }   public Collection<Variable> Variables { get { return this.variables; } }   protected override void Execute(ActivityExecutionContext context) { foreach (var v in variables) { System.Console.WriteLine("{0}:{1}",v.Name,v.Get(context));   } } }
流程
宿主	WorkflowInstance myInstance = new WorkflowInstance(new Sequence1());   myInstance.Run();   System.Console.Read();
結果