在这种情况下，不要调用主范围中的接收活动，而必须在事件处理程序中引发一个错误。

In this case, instead of invoking the receive activity in the main scope, we have to raise a fault in the event handler.

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没有这个接收活动，MainScope 可能会在事件处理程序启动前完成。

Without this receive activity, MainScope could finish before an event handler has been started.

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在循环之后，定义接收活动，该活动将等待最后一个事件处理程序实例调用。

After the loop define a receive activity that waits until it is invoked by the last event handler.

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