使用ThreadPoolTimer C＃uwp的时钟程序

debugcn 发表于 Dev

rur2641

这是基于对上一个问题的答案的模型的。如何在Windows Core IoT应用程序中显示带有当前时间的时钟？，我得到一个例外：“该应用程序调用了一个已编组用于另一个线程的接口。” 如果我通过click事件更改属性，则绑定有效。

public class RunClock: INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged = delegate { };
    ThreadPoolTimer _clockTimer = null;
    private string clock="";
    public string Clock
    {
        set
        {
            clock= value;
            this.OnPropertyChanged();
        }
        get { return clock; } }
    public RunClock()
    {

        _clockTimer = ThreadPoolTimer.CreatePeriodicTimer(_clockTimer_Tick, TimeSpan.FromMilliseconds(1000));            
    private void _clockTimer_Tick(ThreadPoolTimer timer)
    {
        DateTime datetime = DateTime.Now;
        Str1 = datetime.ToString();
    }
    public void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

和Xaml：

<TextBlock Margin="15" Name="timec" Text="{x:Bind Path=RunClock.Clock, Mode=OneWay}"></TextBlock>

先感谢您！

更新，工作代码：

 public class test : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged = delegate { };
    ThreadPoolTimer _clockTimer = null;
    private string str1 = "";
    public string Str1
    {
        set
        {
            str1 = value;
            this.OnPropertyChanged();
        }
        get { return str1; }
    }
    public test()
    {

        _clockTimer = ThreadPoolTimer.CreatePeriodicTimer(_clockTimer_Tick, TimeSpan.FromMilliseconds(1000));
                }
    async private void _clockTimer_Tick(ThreadPoolTimer timer)
    {
       await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,() =>
        {
            DateTime dt = DateTime.Now;
            Str1 = dt.ToString();
        });
    }
    public void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

Xaml（test1是他的viewmodel的一个实例）：

                <TextBlock Margin="15" Name="timec" Text="{x:Bind test1.Str1, Mode=OneWay}"></TextBlock>

阿卡那

异常是因为您尝试在其他线程中修改UI

用这个

 private void _clockTimer_Tick(ThreadPoolTimer timer)
    {
       var dispatcher = Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher;
       await dispatcher.RunAsync(
        CoreDispatcherPriority.Normal, () =>
        {
        // Your UI update code goes here!
        DateTime datetime = DateTime.Now;
        Str1 = datetime.ToString();
        });
    }

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