c# - VisualStateManager WPF 不工作

Question

我专门在 VS Blend 2017 设计器中设计了一个窗口，没有对 XAML 代码应用任何更改。我创建了一个 StateGroup 和一个 State 并记录了 Button 上的更改。尝试从代码隐藏应用状态时，没有任何反应。

我也看过关于同一个问题的主题，但不幸的是没有一个对我有用!

代码隐藏:

VisualStateManager.GoToState(this, "State1", false);

XAML:

<Window x:Class="Wpf_2017.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Wpf_2017"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <VisualStateManager.VisualStateGroups>
            <VisualStateGroup x:Name="MyStates">
                <VisualState x:Name="State1">
                    <Storyboard>
                        <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" Storyboard.TargetName="button">
                            <EasingColorKeyFrame KeyTime="0" Value="#FFEA8686"/>
                        </ColorAnimationUsingKeyFrames>
                        <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="button">
                            <EasingColorKeyFrame KeyTime="0" Value="#FFFF4848"/>
                        </ColorAnimationUsingKeyFrames>
                    </Storyboard>
                </VisualState>
            </VisualStateGroup>
        </VisualStateManager.VisualStateGroups>
        <Button x:Name="button" Content="Button" Margin="208.306,116.798,218.093,0" VerticalAlignment="Top" Height="26.065" Click="button_Click"/>

    </Grid>
</Window>

感谢您的帮助!

Answer 1

我认为您应该使用 GoToElementState 而不是 GoToState。

请试试这个，

将名称添加到网格中:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid x:Name="MyGrid">
        <VisualStateManager.VisualStateGroups>
            <VisualStateGroup x:Name="MyStates">
                <VisualState x:Name="State1">
                    <Storyboard>
                        <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" Storyboard.TargetName="button">
                            <EasingColorKeyFrame KeyTime="0" Value="Red"/>
                        </ColorAnimationUsingKeyFrames>
                        <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="button">
                            <EasingColorKeyFrame KeyTime="0" Value="Blue"/>
                        </ColorAnimationUsingKeyFrames>
                    </Storyboard>
                </VisualState>
            </VisualStateGroup>
        </VisualStateManager.VisualStateGroups>
        <Button x:Name="button" Content="Button" Margin="208.306,116.798,218.093,0" VerticalAlignment="Top" Height="26.065" Click="button_Click"/>

    </Grid>
</Window>

并在代码隐藏中使用它。

        /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void button_Click(object sender, RoutedEventArgs e)
        {
            VisualStateManager.GoToElementState(this.MyGrid, "State1", false);
        }
    }
}