Question

是否可以定义标准的ServiceHostFactory foreach'工作流'服务（xamlx）

我们的客户可以使用自定义工作流设计器制作自己的工作流程（xamlx）。我们强制将workflowservices与TransportSecurity一起使用WS2007FederationHttpBinding。我们转向WorkflowService的ServiceMetadataBehavior，最后添加一个进行某种类型解析的DataContractResolver。

ServiceHostFactory

    public class MyServiceHostFactory : WorkflowServiceHostFactory
{
    protected override WorkflowServiceHost CreateWorkflowServiceHost(
        System.ServiceModel.Activities.WorkflowService service,
        Uri[] baseAddresses)
    {
        WorkflowServiceHost host = base.CreateWorkflowServiceHost(service, baseAddresses);

        foreach (Uri adres in baseAddresses)
        {
            if (adres.Scheme == "https")
            {
                WorkflowCreationEndpoint endpoint = new WorkflowCreationEndpoint(
                    new WS2007FederationHttpBinding("IWorkflowService_ws2007FederationHttpBinding"),
                    new EndpointAddress(adres));

                host.AddServiceEndpoint(endpoint);

                PageflowDataContractResolver.AttachDataContractResolver(endpoint);
            }
        }

        var metadataBehavior = host.Description.Behaviors.Find<ServiceMetadataBehavior>();
        metadataBehavior.HttpGetEnabled = false;

        host.WorkflowExtensions.Add(new WorkflowInstanceTracking());

        return host;
    }

    public override ServiceHostBase CreateServiceHost(string constructorString, Uri[] baseAddresses)
    {
        return base.CreateServiceHost(constructorString, baseAddresses);
    }

    protected override WorkflowServiceHost CreateWorkflowServiceHost(System.Activities.Activity activity, Uri[] baseAddresses)
    {            
        return base.CreateWorkflowServiceHost(activity, baseAddresses);
    }
}

工作流程作为Ron Jacob wrote in this blog存在于数据库中。 “顾问”和/或最终用户可以使用自定义工具创建工作流，但每次他们这样做时都不要忘记在web.config中添加一个不需要的serviceActivation元素。

<system.serviceModel>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="false">
      <baseAddressPrefixFilters>
        <add prefix="http://localhost" />
      </baseAddressPrefixFilters>
      <serviceActivations>
        <add relativeAddress="~/Workflows/test.xamlx" service="Workflows/test.xamlx" factory="Foo.Bar.MyServiceHostFactory" />
      </serviceActivations>
    </serviceHostingEnvironment>
    <protocolMapping>
        <add scheme="https" binding="ws2007FederationHttpBinding" />
    </protocolMapping>
..

Answer 1

我认为将你的问题改为：

是正确的

有没有办法更改Web应用程序的默认WorkflowServiceHostFactory，以便无配置xamlx激活将使用我的WSHF。

如果我正确理解了您的问题，那么我认为没有办法做到这一点。我快速查看是否有一个地方可以覆盖它但看不到任何地方。实现此目的的另一种方法是在用户上载新工作流时根据需要修改web.config。在运行中编辑web.config应该导致当前正在运行的执行脉冲由现有AppDomain服务，同时创建新的AppDomain以服务对Web应用程序的新请求。因此，不应发生工作流处理的损失。这当然需要一些测试和验证。

<强>更新看起来这可能是可能的。如果将以下内容添加到web.config（来自工作流激活的默认配置）。

<?xml version="1.0"?>
<configuration>
  <configSections>
    <sectionGroup name="system.xaml.hosting"
                  type="System.Xaml.Hosting.Configuration.XamlHostingSectionGroup,     System.Xaml.Hosting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
      <section name="httpHandlers"
               type="System.Xaml.Hosting.Configuration.XamlHostingSection, System.Xaml.Hosting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
        </sectionGroup>
  </configSections>

  <system.xaml.hosting>
    <httpHandlers>
      <add xamlRootElementType="System.ServiceModel.Activities.WorkflowService, System.ServiceModel.Activities, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
           httpHandlerType="System.ServiceModel.Activities.Activation.ServiceModelActivitiesActivationHandlerAsync, System.ServiceModel.Activation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
      <add xamlRootElementType="System.Activities.Activity, System.Activities,     Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
           httpHandlerType="System.ServiceModel.Activities.Activation.ServiceModelActivitiesActivationHandlerAsync, System.ServiceModel.Activation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </httpHandlers>
  </system.xaml.hosting>

</configuration>

此默认配置使用的ServiceModelActivitiesActivationHandlerAsync类实现如下：

internal class ServiceModelActivitiesActivationHandlerAsync : ServiceHttpHandlerFactory, IServiceModelActivationHandler
{
    // Methods
    public ServiceHostFactoryBase GetFactory()
    {
        return new WorkflowServiceHostFactory();
    }
}

然后，不要使用ServiceModelActivitiesActivationHandlerAsync，而是自己提供一个实现，它在GetFactory方法中实例化您自己的WorkflowServiceHostFactory。更新上面的web.config以指向您的新httpHandlerType，您应该完成。

我根本没有测试过这个。 IIS可能不会像web.config那样覆盖system.xaml.hosting部分。

定义不同的默认ServiceHostFactory foreach工作流程

1 个答案: