我应该如何停止长时间运行的 WF4 工作流程？
我正在开发一些 Workflow 4 活动，这些活动将不断循环并完成一些工作。例如，人们可以观看 RSS 源并在添加新项目时执行一些步骤。我希望能够干净地停止并重新启动此过程（即在 Windows 服务或 Azure 辅助角色中）。目前，我有一个 While 循环，其表达式始终解析为 true，并在应用程序关闭时让实例终止。但这似乎不是一个非常干净的停止工作流程的方法。
我应该如何停止和重新启动工作流程？
I'm developing some Workflow 4 activities that will continuously loop and do some work. For example, one may watch an RSS feed and execute some steps as new items are added. I would like to be able to stop and restart this process cleanly (ie, in a windows service or Azure Worker Role). Currently, I have a While loop with an expression that always resolves to true, and just let the instance die when the app closes. But it seems like this is not a very clean way to stop the workflow.
How should I stop and restart the workflow?
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确切的系统有点取决于您托管工作流程的方式，但我假设您正在使用 WorkflowApplication。在这种情况下，简单的选择是使用 WorkflowApplication，它具有 Cancel 方法，您可以使用它来取消工作流的执行。您还可以创建添加书签的活动并恢复停止书签或类似的操作，但这可能有点过头了。
The exact system depends a bit in the way you host your workflow but I am assuming you are using the WorkflowApplication. In that case simple option is to use the WorkflowApplication which has a Cancel method you can use to cancel execution of the workflow. You can also create a bookmarked activity and resume a stop bookmark or something similar but that might be overkill.