WF4.0 Beta1 变量 Variables

 

只有具备[Variables]属性的Activity才可以定义变量

[Variables] 的数据类型为System.Collections.ObjectModel.Collection<System.Activities.Variable>

 

变量添加

在WF设计器中添加

 

变量存放在所在[Activity]的内部,

 

<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>

 

在定义变量的[Activity]内部的[Activity]可以访问变量,在定义变量的[Activity]外部的[Activity]无法访问变量

 

无法通过启动传参方式为[变量]赋值.无法在流程完成事件中接收[变量]的值

 

定义具有[Variables]属性的Activity

自定义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();
结果