SmartCardReader不会触发CardAdded方法吗？

Question

当点击NFC标签时，我正在尝试让Microsoft Phone触发和事件。但是，当点击标签时，该方法不会触发。当点击标签时，cardReader_CardAdded应该会触发，但它什么也不做。代码如下：

public MainPage()
    {
        this.InitializeComponent();

        smartCard();
    }

    public async void smartCard()
    {

        string selector = SmartCardReader.GetDeviceSelector();
        DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(selector);
        foreach (DeviceInformation device in devices)
        {
            SmartCardReader reader = await SmartCardReader.FromIdAsync(device.Id);
            reader.CardAdded += cardReader_CardAdded;
            reader.CardRemoved += cardReader_CardRemoved;
        }
    }
    private void cardReader_CardRemoved(SmartCardReader sender, CardRemovedEventArgs args)
    {

    }
    private async void cardReader_CardAdded(SmartCardReader sender, CardAddedEventArgs args)
    {
        await HandleCard(args.SmartCard);
    }

    private async Task HandleCard(SmartCard card)
    {
        SmartCardProvisioning provisioning = await SmartCardProvisioning.FromSmartCardAsync(card);

        SmartCardStatus status;
        do
        {
            status = await provisioning.SmartCard.GetStatusAsync();
        } while (status == SmartCardStatus.Shared);

    }

Answer 1

答:我忘记在Package.appxmanifest中的功能下启用邻近性