C# 用户控件未使用 DispatcherTimer Tick 事件更新

Question

我在使用 DispatcherTimer 发出信号以从某些温度传感器获取新数据时在主页中更新 UserControl 时遇到问题。

Sensors.xaml.cs

public sealed partial class Sensors : UserControl
{
    public Sensors()
    {
        this.InitializeComponent();
    }

    public string Sensorlbl
    {
        get { return (string)GetValue(SensorlblProperty); }
        set { SetValue(SensorlblProperty, value); }
    }

    // Using a DependencyProperty as the backing store for Sensorlbl.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty SensorlblProperty =
        DependencyProperty.Register("SensorLbl", typeof(string), typeof(Sensors), null);

Sensors.xaml

<Grid>
    <TextBlock Name="SensorLbl" HorizontalAlignment="Center" VerticalAlignment="Top" Margin="0,5,0,0" Text="{Binding Sensorlbl, ElementName=userControl, Mode=TwoWay}"/>
</Grid>

MainPage.xaml.cs

    public MainPage()
    {
        tempTimer = new DispatcherTimer();
        tempTimer.Tick += GetTemp;
        tempTimer.Interval = TimeSpan.FromMilliseconds(1000);
        tempTimer.Start();

        Sensor1.Sensorlbl = "test";
    }
    public void GetTemp(object sender, object e)
    {
        Sensor1.Sensorlbl = "Test Working";

        Debug.WriteLine(Sensor1.Sensorlbl);
    }

MainPage.xaml

<local:Sensors x:Name="Sensor1" Margin="0,0,0,0" Width="107" Height="155" />

对于上面的示例，我只是用它来尝试证明更新 MainPage 中使用的 UserControl。当我运行程序时，我得到 "Test Working" 的输出，但屏幕仍然只显示 "test".

感谢任何建议。

Answer 1

DependencyProperty 的注册区分大小写。它必须与属性的名称精确匹配。在您的情况下，您不匹配：SensorLbl 与 Sensorlbl。

C# 用户控件未使用 DispatcherTimer Tick 事件更新

C# usercontrol not updating with DispatcherTimer Tick Event

c#

xaml

user-controls

windows-10-iot-core

uwp