为什么characteristic.ReadValueAsync() 有时会抛出ObjectDisposedException？

如何解决为什么characteristic.ReadValueAsync() 有时会抛出ObjectDisposedException？

当特征调用 ReadValueAsync 时，以下代码有时会引发 ObjectdisposedException。调试器说该特性有效。违规代码如下所示：

private async void OnAdvertisementReceived(bluetoothleadvertisementwatcher watcher,BluetoothLEAdvertisementReceivedEventArgs eventArgs)
{
slim.Wait();
BluetoothLEDevice bluetoothLEDevice = await BluetoothLEDevice.FromBluetoothAddressAsync(eventArgs.BluetoothAddress);
if (bluetoothLEDevice != null)
{
GattDeviceServicesResult servicesResult = await bluetoothLEDevice.GetGattServicesAsync();
foreach (GattDeviceService service in servicesResult.Services)
{
GattcharacteristicsResult characteristicsResult = await service.GetcharacteristicsAsync();
foreach (GattCharacteristic characteristic in characteristicsResult.characteristics)
{
    if (characteristic.CharacteristicProperties.Equals(GattCharacteristicProperties.Read))
    {
        GattReadResult readResult = await characteristic.ReadValueAsync();
    }
}

}
}
}
slim.Release();
}