是否可以为每个“工作流”服务(xamlx)定义标准的 ServiceHostFactory
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 (xamlx)。我们强制工作流服务使用带有 TransportSecurity 的 WS2007FederationHttpBinding。我们为 WorkflowService 开启 ServiceMetadataBehavior,最后添加一个 DataContractResolver 来进行一些类型解析。
服务主机工厂
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);
}
}
正如 Ron Jacob在此博客中所写,工作流存在于数据库中。“顾问”和/或最终用户可以使用自定义工具创建工作流,但每次他们都不能忘记在 web.config 中添加不需要的 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>
..