WF4.0 基础篇 (二十六) Interop调用WF3.X的Activity

本节主要介绍Interop调用WF3.X的Activity

 

本文例子下载:
http://files.cnblogs.com/foundation/InteropSample.rar
本文例子说明



 

Interop调用WF3.X的Activity

类名	System.Activities.Statements.Interop
文件	System.Workflow.Runtime.dll
结构说明	继承 NativeActivity, ICustomTypeDescriptor 是一个 sealed类 override 了 [CacheMetadata方法] 与 [Cancel方法] 与[Execute方法] override 了 [CanInduceIdle属性] [ActivityMetaProperties]属性的类型为[IDictionary<string, object>] [ActivityProperties]属性的类型为[IDictionary<string, object>] [ActivityType]属性的类型为[Type]
功能说明	[ActivityType属性]用于指定要调用的WF3.5的Activity的类型 当指定WF3.5的Activity的类型后,在设计器中会自动为WF3.5的Activity的绑定生成两个参数一个为[属性名],另一个为[属性名Out]

 

 



 

使用说明

默认有WF4.0项目为[.NET Framework 4 Client Profile],要使用Interop,应将项目改为[.NET Framework 4 ]



 

Interop默认没出现在工具栏中,需要添加



 

 

[ActivityType属性]用于指定要调用的WF3.5的Activity的类型



 



 

当指定WF3.5的Activity的类型后,在设计器中会自动为WF3.5的Activity的绑定生成两个参数一个为[属性名],另一个为[属性名Out]



 

例子1:调用WF3.X的Activity

说明:

1.创建一WF3.X的Activity,有一绑定属性[printText]

Activity在[ Execute]方法中打印[printText]的值,并为[printText]赋予一新值

 

2.创建一WF4的工作流,用[Interop]调用WF3.X的Activity,为[printText]传入值,并打印通过[printText]的返回值

 

WF3.X的Activity	public partial class myActivity : Activity { public myActivity() { InitializeComponent(); }   [System.Diagnostics.DebuggerNonUserCode] [System.CodeDom.Compiler.GeneratedCode("", "")] private void InitializeComponent() { this.Name = "myActivity"; }   public static readonly DependencyProperty printTextProperty = DependencyProperty.Register("printText", typeof(string), typeof(myActivity));   public string printText { get { return (string)base.GetValue(printTextProperty); } set { base.SetValue(printTextProperty, value); } }   protected override ActivityExecutionStatus Execute(ActivityExecutionContext context) { Console.WriteLine(this.printText); this.printText = printText + ":wxd"; return ActivityExecutionStatus.Closed; } }
WF4的工作流
宿主	static void test1() { WorkflowInvoker.Invoke(new testWorkflow());   }
结果

 

 

例2:代码操作

static void test2() {   Variable<string> myVariable = new Variable<string>() { Default = "wxwinter" }; Sequence root = new Sequence() { Variables = { myVariable }, Activities = {   new Interop() { ActivityType = typeof(myActivity), ActivityProperties = {   { "printText", new InArgument<string>(myVariable) } , { "printTextOut", new OutArgument<string>(myVariable) }   }, ActivityMetaProperties = { // Provide a value for the Name meta-property of the WriteLine { "Name", "myActivity" } } } , new WriteLine{ Text=myVariable} } };   WorkflowInvoker.Invoke(root); }