WF4 RC - 使用 ActivityXamlServices 从松散 Xaml 加载 WF 服务时无法创建未知类型 [英] WF4 RC - Cannot create unknown type when loading WF Service from loose Xaml with ActivityXamlServices
问题描述
我正在尝试动态托管 WF4 (RC) 服务.我有一个包含两个项目的测试解决方案.第一个是声明性工作流服务库，其中包含一个根 Flowchart 活动和一个简单的自定义代码活动.工作流服务库不依赖于任何其他自定义程序集或引用.第二个是我的主机应用程序，在我的测试解决方案中它只是一个控制台应用程序.
I am trying to host a WF4 (RC) Service dynamically. I have a test solution with two projects. The first is a declarative workflow service library with one root Flowchart activity in it, and a simple custom code activity. The workflow service library does not depend on any other custom assemblies or references. The second is my host app, which in my test solution is just a console application.
在我的主机应用程序中，我尝试使用 ActivityXamlServices 将工作流服务的 Xaml 加载到活动中，然后使用 WorkflowServiceHost 使用该活动启动工作流实例.
In my host app, I am attempting to the use ActivityXamlServices to load the Xaml for the workflow service into an activity, and then use the WorkflowServiceHost to fire up a workflow instance using that activity.
一旦我尝试新建 WorkflowServiceHost 对象，我就会收到此异常...
As soon as I try to new up the WorkflowServiceHost object, I get this exception...
无法创建未知类型'{clr-namespace:DeclarativeServiceLibrary1}CodeActivity1'.
Cannot create unknown type '{clr-namespace:DeclarativeServiceLibrary1}CodeActivity1'.
如果我从 Flowchart 设计器中删除 CodeActivity1，则一切正常.如果我从我的宿主项目添加对工作流服务项目的直接引用，然后使用我的 Flowchart 活动的实例而不是从 Xaml 创建的活动创建一个 WorkflowServiceHost，它也可以正常工作.
If I remove CodeActivity1 from my Flowchart designer, everything runs fine. If I add a direct reference to the workflow service project from my host project and then create a WorkflowServiceHost using an instance of my Flowchart activity instead of the activity created from the Xaml, it also works fine.
在动态加载时，由于某种原因似乎不喜欢使用我的 CodeActivity.
It seems to not like using my CodeActivity for some reason when loaded dynamically.
有人对我为什么不能动态创建我的工作流服务有任何想法吗?
Anyone have any ideas as to why I can't dynamically create my workflow service?
我的代码如下...
DeclarativeServiceLibrary1.Activity1.xaml...
DeclarativeServiceLibrary1.Activity1.xaml...
<Activity mc:Ignorable="sap" x:Class="DeclarativeServiceLibrary1.Activity1" sap:VirtualizedContainerService.HintSize="654,676" mva:VisualBasic.Settings="Assembly references and imported namespaces for internal implementation" xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities" xmlns:av="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:local="clr-namespace:DeclarativeServiceLibrary1" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:mv="clr-namespace:Microsoft.VisualBasic;assembly=System" xmlns:mva="clr-namespace:Microsoft.VisualBasic.Activities;assembly=System.Activities" xmlns:p="http://schemas.microsoft.com/netfx/2009/xaml/servicemodel" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:s1="clr-namespace:System;assembly=System" xmlns:s2="clr-namespace:System;assembly=System.Xml" xmlns:s3="clr-namespace:System;assembly=System.Core" xmlns:sad="clr-namespace:System.Activities.Debugger;assembly=System.Activities" xmlns:sap="http://schemas.microsoft.com/netfx/2009/xaml/activities/presentation" xmlns:scg="clr-namespace:System.Collections.Generic;assembly=System" xmlns:scg1="clr-namespace:System.Collections.Generic;assembly=System.ServiceModel" xmlns:scg2="clr-namespace:System.Collections.Generic;assembly=System.Core" xmlns:scg3="clr-namespace:System.Collections.Generic;assembly=mscorlib" xmlns:sd="clr-namespace:System.Data;assembly=System.Data" xmlns:sl="clr-namespace:System.Linq;assembly=System.Core" xmlns:st="clr-namespace:System.Text;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Flowchart sad:XamlDebuggerXmlReader.FileName="C:\dev\test\MyWorkflow\DeclarativeServiceLibrary1\Activity1.xaml" sap:VirtualizedContainerService.HintSize="614,636">
<sap:WorkflowViewStateService.ViewState>
<scg3:Dictionary x:TypeArguments="x:String, x:Object">
<x:Boolean x:Key="IsExpanded">False</x:Boolean>
<av:Point x:Key="ShapeLocation">270,2.5</av:Point>
<av:Size x:Key="ShapeSize">60,75</av:Size>
<av:PointCollection x:Key="ConnectorLocation">300,77.5 300,107.5 300,165</av:PointCollection>
</scg3:Dictionary>
</sap:WorkflowViewStateService.ViewState>
<Flowchart.StartNode>
<FlowStep x:Name="__ReferenceID0">
<sap:WorkflowViewStateService.ViewState>
<scg3:Dictionary x:TypeArguments="x:String, x:Object">
<av:Point x:Key="ShapeLocation">172.5,165</av:Point>
<av:Size x:Key="ShapeSize">255,90</av:Size>
<av:PointCollection x:Key="ConnectorLocation">300,255 300,285 300,299.5</av:PointCollection>
</scg3:Dictionary>
</sap:WorkflowViewStateService.ViewState>
<p:Receive CanCreateInstance="True" sap:VirtualizedContainerService.HintSize="255,90" OperationName="MyOperation" ServiceContractName="MyContractName" />
<FlowStep.Next>
<FlowStep x:Name="__ReferenceID1">
<sap:WorkflowViewStateService.ViewState>
<scg3:Dictionary x:TypeArguments="x:String, x:Object">
<av:Point x:Key="ShapeLocation">194.5,299.5</av:Point>
<av:Size x:Key="ShapeSize">211,61</av:Size>
<av:PointCollection x:Key="ConnectorLocation">300,360.5 300,390.5 300,399</av:PointCollection>
</scg3:Dictionary>
</sap:WorkflowViewStateService.ViewState>
<WriteLine sap:VirtualizedContainerService.HintSize="211,61" Text="Workflow started" />
<FlowStep.Next>
<FlowStep x:Name="__ReferenceID3">
<sap:WorkflowViewStateService.ViewState>
<scg3:Dictionary x:TypeArguments="x:String, x:Object">
<av:Point x:Key="ShapeLocation">200,399</av:Point>
<av:Size x:Key="ShapeSize">200,22</av:Size>
<av:PointCollection x:Key="ConnectorLocation">300,421 300,451 300,479.5</av:PointCollection>
</scg3:Dictionary>
</sap:WorkflowViewStateService.ViewState>
<local:CodeActivity1 sap:VirtualizedContainerService.HintSize="200,22" />
<FlowStep.Next>
<FlowStep x:Name="__ReferenceID2">
<sap:WorkflowViewStateService.ViewState>
<scg3:Dictionary x:TypeArguments="x:String, x:Object">
<av:Point x:Key="ShapeLocation">194.5,479.5</av:Point>
<av:Size x:Key="ShapeSize">211,61</av:Size>
</scg3:Dictionary>
</sap:WorkflowViewStateService.ViewState>
<WriteLine sap:VirtualizedContainerService.HintSize="211,61" Text="The code activity worked!" />
</FlowStep>
</FlowStep.Next>
</FlowStep>
</FlowStep.Next>
</FlowStep>
</FlowStep.Next>
</FlowStep>
</Flowchart.StartNode>
<x:Reference>__ReferenceID0</x:Reference>
<x:Reference>__ReferenceID1</x:Reference>
<x:Reference>__ReferenceID2</x:Reference>
<x:Reference>__ReferenceID3</x:Reference>
</Flowchart>
</Activity>
DeclarativeServiceLibrary1.CodeActivity1.cs ...
DeclarativeServiceLibrary1.CodeActivity1.cs ...
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Activities;
namespace DeclarativeServiceLibrary1
{
public sealed class CodeActivity1 : CodeActivity
{
// Define an activity input argument of type string
//public InArgument<string> Text { get; set; }
// If your activity returns a value, derive from CodeActivity<TResult>
// and return the value from the Execute method.
protected override void Execute(CodeActivityContext context)
{
// Obtain the runtime value of the Text input argument
//string text = context.GetValue(this.Text);
}
}
}
DeclarativeServiceLibrary1.Web.Config ...
DeclarativeServiceLibrary1.Web.Config ...
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior>
<!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
<serviceMetadata httpGetEnabled="true"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
</configuration>
ConsoleApplication1.Program.cs ...
ConsoleApplication1.Program.cs ...
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Activities;
using System.Activities.XamlIntegration;
using System.ServiceModel;
using System.ServiceModel.Activities;
using System.ServiceModel.Description;
using System.Xaml;
using System.Reflection;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
string baseAddress = @"http://localhost:8081/MyContractName";
string curDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
string wfDefPath = Path.Combine(curDir, "Activity1.xaml");
Activity workflowActivity = (Activity)ActivityXamlServices.Load(wfDefPath);
WorkflowService service = new WorkflowService { Body = workflowActivity };
Uri serviceUri = new Uri(baseAddress, UriKind.Absolute);
WorkflowServiceHost host = new WorkflowServiceHost(service, new Uri[] { serviceUri });
host.Open();
//Display that we are listening on the console window
Console.WriteLine("Workflow '{0}' is listening at '{1}'", host.Activity.DisplayName, baseAddress);
Console.ReadLine();
}
}
}
我在声明性工作流服务库中有一个构建后事件，它将程序集和 Xaml 文件复制到主机控制台应用程序的 bin\debug\ 文件夹中.
I have a post-build event in the delarative workflow service library that copies the Assembly and Xaml file into the bin\debug\ folder of the host console app.
推荐答案
简短回答 - Xaml 加载无法推断本地(默认)程序集，因此您需要在 XamlReaderSettings.LocalAssembly 上指定它.
Short answer - Xaml load can't infer the local (default) assembly, so you need to specify it on XamlReaderSettings.LocalAssembly.
这篇关于WF4 RC - 使用 ActivityXamlServices 从松散 Xaml 加载 WF 服务时无法创建未知类型的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
