<Button.Triggers> <EventTrigger RoutedEvent="Loaded"></EventTrigger> </Button.Triggers> routedevent是个枚举吗？

`<Button.Triggers>` 是 WPF（Windows Presentation Foundation）中的一个元素，它用于在 Button 控件特定事件发生时执行一些操作，如响应按钮被加载（`Loaded`）等。`EventTrigger` 是一个类型的组件，用来触发事件处理程序，这里的 `RoutedEvent` 属性的确是一个枚举类型。

`RoutedEvent` 指定了事件的名称，它是 Windows Presentation Foundation 中所有可路由事件的命名约定。对于 `Loaded` 这个事件，它表示当 Button 或任何包含它的元素完成其初始布局和内容加载时触发。

相关问题

利用wpf写一个loading动画

以下是一个简单的WPF Loading动画的代码：

<Window x:Class="LoadingAnimationWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="LoadingAnimationWindow" Height="150" Width="350">
    <Grid>
        <Ellipse x:Name="Ellipse1" Width="30" Height="30" Fill="LightBlue">
            <Ellipse.RenderTransform>
                <TranslateTransform X="0" Y="0"/>
            </Ellipse.RenderTransform>
            <Ellipse.Triggers>
                <EventTrigger RoutedEvent="Loaded">
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetProperty="(Ellipse.RenderTransform).(TranslateTransform.X)"
                                             From="0" To="200" Duration="0:0:1" RepeatBehavior="Forever"/>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Ellipse.Triggers>
        </Ellipse>
        <Ellipse x:Name="Ellipse2" Width="30" Height="30" Fill="LightBlue">
            <Ellipse.RenderTransform>
                <TranslateTransform X="0" Y="0"/>
            </Ellipse.RenderTransform>
            <Ellipse.Triggers>
                <EventTrigger RoutedEvent="Loaded">
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetProperty="(Ellipse.RenderTransform).(TranslateTransform.X)"
                                             From="0" To="-200" Duration="0:0:1" RepeatBehavior="Forever"/>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Ellipse.Triggers>
        </Ellipse>
    </Grid>
</Window>

这个Loading动画使用了两个椭圆（Ellipse）来表示动画，每个椭圆都有一个 `TranslateTransform` 作为其渲染变换（Render Transform），并在其 `Loaded` 事件中启动一个 `Storyboard`，使用 `DoubleAnimation` 来改变 `TranslateTransform` 的 X 坐标值，从而实现椭圆的移动。两个椭圆的移动方向相反，从而形成动画效果。

用wpf写一个load等待的漂亮的界面

以下是一个简单的WPF等待界面示例：

<Window x:Class="WpfLoadingDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="WPF Loading Demo" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>
        <TextBlock Text="Loading..." Grid.Row="0" Grid.Column="1" HorizontalAlignment="Center" Margin="0,40,0,0"/>
        <Canvas Grid.Row="1" Grid.Column="1">
            <Ellipse Canvas.Left="0" Canvas.Top="0" Width="20" Height="20" Fill="#FF8C8C8C">
                <Ellipse.Triggers>
                    <EventTrigger RoutedEvent="Loaded">
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimationUsingKeyFrames BeginTime="00:00:00"
                                                               Storyboard.TargetName="ellipse"
                                                               Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(RotateTransform.Angle)"
                                                               RepeatBehavior="Forever">
                                    <SplineDoubleKeyFrame KeyTime="0:0:0" Value="0"/>
                                    <SplineDoubleKeyFrame KeyTime="0:0:1" Value="360"/>
                                </DoubleAnimationUsingKeyFrames>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger>
                </Ellipse.Triggers>
                <Ellipse.RenderTransform>
                    <TransformGroup>
                        <ScaleTransform/>
                        <SkewTransform/>
                        <RotateTransform/>
                        <TranslateTransform/>
                    </TransformGroup>
                </Ellipse.RenderTransform>
            </Ellipse>
            <Ellipse x:Name="ellipse" Canvas.Left="0" Canvas.Top="0" Width="20" Height="20" StrokeThickness="5" Stroke="#FF26C6DA"
                     Fill="Transparent" >
                <Ellipse.Triggers>
                    <EventTrigger RoutedEvent="Loaded">
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimationUsingKeyFrames BeginTime="00:00:00"
                                                               Storyboard.TargetName="ellipse"
                                                               Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(RotateTransform.Angle)"
                                                               RepeatBehavior="Forever">
                                    <SplineDoubleKeyFrame KeyTime="0:0:0" Value="0"/>
                                    <SplineDoubleKeyFrame KeyTime="0:0:1" Value="360"/>
                                </DoubleAnimationUsingKeyFrames>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger>
                </Ellipse.Triggers>
                <Ellipse.RenderTransform>
                    <TransformGroup>
                        <ScaleTransform/>
                        <SkewTransform/>
                        <RotateTransform/>
                        <TranslateTransform/>
                    </TransformGroup>
                </Ellipse.RenderTransform>
            </Ellipse>
            <Ellipse Canvas.Left="0" Canvas.Top="0" Width="20" Height="20" StrokeThickness="5" Stroke="#FF26C6DA"
                     Fill="Transparent" >
                <Ellipse.Triggers>
                    <EventTrigger RoutedEvent="Loaded">
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimationUsingKeyFrames BeginTime="00:00:00"
                                                               Storyboard.TargetName="ellipse"
                                                               Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(RotateTransform.Angle)"
                                                               RepeatBehavior="Forever">
                                    <SplineDoubleKeyFrame KeyTime="0:0:0" Value="0"/>
                                    <SplineDoubleKeyFrame KeyTime="0:0:1" Value="360"/>
                                </DoubleAnimationUsingKeyFrames>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger>
                </Ellipse.Triggers>
                <Ellipse.RenderTransform>
                    <TransformGroup>
                        <ScaleTransform/>
                        <SkewTransform/>
                        <RotateTransform/>
                        <TranslateTransform/>
                    </TransformGroup>
                </Ellipse.RenderTransform>
            </Ellipse>
        </Canvas>
    </Grid>
</Window>

这个等待界面由三个重叠的圆组成，中心圆是灰色的，边缘两个圆是蓝色的。圆通过“旋转变换”动画旋转，以创建旋转动画效果。您可以自定义颜色和大小以创建自己的等待界面。