Question

我正在尝试制作一个二进制时钟，它工作正常。

就像这样。

每次调用一个名为run的方法时，它会设置时间，并更改一些img源（img是我的灯，每次关闭或打开时都会更改img源。）

但是我怎样才能让它一直运行？

如果我制作一个循环，它将无法在我的手机上启动，就像使用线程确实可以做任何事情一样。

更改某些属性后是否有更新gui的方法？

XMAL代码

<phone:PhoneApplicationPage 
x:Class="BinSample.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True">

<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>

    <!--TitlePanel contains the name of the application and page title-->
    <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
        <TextBlock x:Name="ApplicationTitle" Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}"/>
        <TextBlock x:Name="PageTitle" Text="page name" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
    </StackPanel>

    <!--ContentPanel - place additional content here-->
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
        <Image Height="80" HorizontalAlignment="Left" Margin="141,187,0,0" Name="imag1" Stretch="Fill" VerticalAlignment="Top" Width="106" Source="/BinSample;component/img/knapSluk.png" />
    </Grid>
</Grid>

    public MainPage()
    {
        InitializeComponent();

        //test one
        //try to make a neverending loop
        Run();

        //testc two
        //try loop with thread an sleep funtion.
        thredRun();


    }

    public void thredRun()
    {
        new Thread(new ThreadStart(thredRun));
        while (true)
        {
            Run();
            Thread.Sleep(100);
        }
    }

    public void Run()
    {
        while (true)
        {
            int hour = DateTime.Now.Hour;
            if (hour % 10 == 0)
                imag1.Source = new BitmapImage(new Uri("img/knapTaand.png", UriKind.Relative));
            else
                imag1.Source = new BitmapImage(new Uri("img/knapSluk.png", UriKind.Relative));
        }
    }
}

Answer 1

这里有一些问题。

首先，您没有正确使用Thread类check this tutorial to get started

即使您确实更正了Thread类的使用，您要么最终阻止UI线程，要么最终会遇到跨线程异常。

在这种情况下，您可能最简单的方法就是使用DispatcherTimer

public MainPage()
{
    InitializeComponent();
    DispatcherTimer timer = new DispatcherTimer() { Interval = TimeSpan.FromHours(1) };
    timer.Tick += new EventHandler(timer_Tick);
    SetImageSource();
    timer.Start();
}

void timer_Tick(object sender, EventArgs e)
{
    SetImageSource();
}

void SetImageSource()
{
    int hour = DateTime.Now.Hour;
    if (hour % 10 == 0)
        imag1.Source = new BitmapImage(new Uri("img/knapTaand.png", UriKind.Relative));
    else
        imag1.Source = new BitmapImage(new Uri("img/knapSluk.png", UriKind.Relative));
}

Silverlight，通过更改img源c＃来更新gui

1 个答案: