从（部分类）后面的代码外部触发属性更改事件

Question

我已经使用WPF / XAML编写了一个简单的UI，并成功地使用了iNotifyPropertyChanged方法来更新一些值。。。

XAML：

<TextBlock Grid.Column="3" Grid.Row="1" Margin=" 1" Text="{Binding DeviceType, StringFormat=0, Mode=OneWay}" FontFamily="Nexa"/>
<TextBlock Grid.Column="3" Grid.Row="2" Margin= "1" Text="{Binding DeviceSerial, StringFormat=0, Mode=OneWay}" FontFamily="Nexa"/>
<TextBlock Grid.Column="3" Grid.Row="3" Margin=" 1" Text="{Binding DeviceName, StringFormat=0, Mode=OneWay}"  FontFamily="Nexa"/>
<TextBlock Grid.Column="3" Grid.Row="4" Margin=" 1" Text="{Binding DeviceBatteryLevel, StringFormat=0, Mode=OneWay}"  FontFamily="Nexa"/>

背后的代码：

public partial class MainWindow : Window
{
    public InstrumentViewModel Instrument = new InstrumentViewModel();

    public MainWindow()
    {
        InitializeComponent();

        this.WindowStartupLocation = WindowStartupLocation.CenterScreen;

        DataContext = Instrument;    

        var collection = new PortableDeviceCollection();

        collection.Refresh();

        foreach (var device in collection)
        {
            device.Connect();

            if (device.DeviceModel == "Instrument Test Platform")
            {

                Instrument.DeviceType = device.DeviceModel;
                Instrument.DeviceSerial = device.DeviceSerialNumber;
                Instrument.DeviceName = device.FriendlyName;

            }
        }

    }
}

这绝对好用。但是，我想使用计时器来轮询设备。当我执行此操作并尝试使用Timer事件中的INotifyPropertyChanged方法时，正在更新我的Instrument类中的属性-但未设置XAML绑定。

我正在尝试：

public partial class MainWindow : Window
{

    public InstrumentViewModel Instrument = new InstrumentViewModel();

    public MainWindow()
    {
        InitializeComponent();

        this.WindowStartupLocation = WindowStartupLocation.CenterScreen;

        DataContext = Instrument;    

        Timer intervalTimer = new Timer(5000);
        intervalTimer.Enabled = true;
        intervalTimer.AutoReset = true;
        intervalTimer.Elapsed += OnTimedEvent;

    }

    private static void OnTimedEvent(Object source, System.Timers.ElapsedEventArgs e)
    {

        InstrumentViewModel Instrument = new InstrumentViewModel();

        var collection = new PortableDeviceCollection();

        collection.Refresh();

        foreach (var device in collection)
        {
            device.Connect();

            if (device.DeviceModel == "Instrument Test Platform")
            {

                Instrument.DeviceType = device.DeviceModel;
                Instrument.DeviceSerial = device.DeviceSerialNumber;
                Instrument.DeviceName = device.FriendlyName;

            }
        }
    }
}

我想我这里缺少一些基本知识，但是我假设位于MainWindow类中的OnTimedEvent方法仍将能够从XAML代码访问DataBinding。

这与我设置的位置有关吗 DataContext = Instrument;吗？

任何建议表示赞赏。

谢谢。