Returns the type of internet reachability currently possible on the device.
此属性主要用于手持设备,以区分快速且
廉价的 WiFi 连接与运营商网络。
Note: Do not use this property to determine the actual connectivity. For example, the device can be connected to a hot spot, but not have the actual route to the network.
Non-handhelds are considered to be always capable of NetworkReachability.ReachableViaLocalAreaNetwork.
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