如何使用雙影片而不是使用計時器來計數

以下代碼使用Timer從 1 開始計數到永遠。

XAML 代碼：

<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
    <Label x:Name="myLabel"/>
</Grid>
</Window>

vb.net 代碼：

Class MainWindow

Dim myDispatcherTimer As New Windows.Threading.DispatcherTimer With {.Interval = TimeSpan.FromSeconds(1)}

Private Sub MainWindow_Loaded(sender As Object, e As RoutedEventArgs) Handles Me.Loaded
    AddHandler myDispatcherTimer.Tick, AddressOf Me.Hello
    myDispatcherTimer.Start()
End Sub

Public Sub Hello()
    Static myStatic As Integer = 0
    myStatic = myStatic   1
    myLabel.Content = myStatic
End Sub

End Class

我想通過使用Double Animation而不是使用Timer來計數。

可能嗎？

提前致謝。

uj5u.com熱心網友回復：

您可以創建一個附加型別的屬性，double該Content屬性設定應用它的任何 ContentControl（例如標簽）的屬性。

public static class Counter
{
    public static readonly DependencyProperty CountProperty =
        DependencyProperty.RegisterAttached(
            "Count", typeof(double), typeof(Counter),
            new PropertyMetadata(0d, CountPropertyChanged));

    public static double GetCount(DependencyObject obj)
    {
        return (double)obj.GetValue(CountProperty);
    }

    public static void SetCount(DependencyObject obj, double value)
    {
        obj.SetValue(CountProperty, value);
    }

    private static void CountPropertyChanged(
        DependencyObject obj, DependencyPropertyChangedEventArgs args)
    {
        if (obj is ContentControl control)
        {
            control.Content = string.Format("{0:F0}", args.NewValue);
        }
    }
}

然后通過適當的 DoubleAnimation 為該屬性設定影片。

<Label>
    <Label.Triggers>
        <EventTrigger RoutedEvent="Loaded">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation
                        Storyboard.TargetProperty="(local:Counter.Count)"
                        From="0" By="1" Duration="0:0:1"
                        IsCumulative="True" RepeatBehavior="Forever"/>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Label.Triggers>
</Label>

由于您顯然只想顯示整數值，因此您不妨使用Int32Animation帶有 type 附加屬性的 an int。

public static class Counter
{
    public static readonly DependencyProperty CountProperty =
        DependencyProperty.RegisterAttached(
            "Count", typeof(int), typeof(Counter),
            new PropertyMetadata(0, CountPropertyChanged));

    public static int GetCount(DependencyObject obj)
    {
        return (int)obj.GetValue(CountProperty);
    }

    public static void SetCount(DependencyObject obj, int value)
    {
        obj.SetValue(CountProperty, value);
    }

    private static void CountPropertyChanged(
        DependencyObject obj, DependencyPropertyChangedEventArgs args)
    {
        if (obj is ContentControl control)
        {
            control.Content = args.NewValue;
        }
    }
}

和

<Storyboard>
    <Int32Animation
        Storyboard.TargetProperty="(local:Counter.Count)"
        From="0" By="1" Duration="0:0:1"
        IsCumulative="True" RepeatBehavior="Forever"/>
</Storyboard>

標籤：wpf VB.net 计时器 调度员定时器 双动画

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