检查操作是否仍在运行。
如果操作仍在运行，则返回 true。否则，返回 false。此属性返回 false 后，您可以检查 RequestToUseMobileDataAsyncOperation.result，以查看最终用户是否允许应用程序使用移动数据。只读。其他资源：RequestToUseMobileDataAsyncOperation.isDone，RequestToUseMobileDataAsyncOperation.result。
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