To do this, the client of the process invokes the cancellation operation that is implemented using an event handler.
为此，流程的客户机将调用使用事件处理程序实现的取消操作。
If your application has a button to cancel a long-running operation but you're doing work in the UI thread, the cancellation event won't be delivered until after the operation has finished!
如果应用程序有一个按钮用于取消某个长时间运行的操作，而您正在使用UI线程执行操作，那么这个取消事件只有到UI线程所做的操作完成后才会被处理！
An invocation of an operation provided by a process: For example, a claims handling process supports the cancellation of a claim while the process is currently running.
对流程提供的操作的调用：例如，声明处理流程支持在流程当前正在运行时取消声明。
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