WPF 加载等待动画

直接上代码：

xmal：

<Controls:MetroWindow x:Class="MyControlLibrarys.LoadDialog"
        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:MyControlLibrarys"      
        Title="正在加载" WindowStyle="None" Height="180" Width="430" ShowMaxRestoreButton="False" ShowMinButton="False" ShowCloseButton="False"
        WindowStartupLocation="CenterScreen" Opacity="1">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="4*"/>
        </Grid.ColumnDefinitions>
        <Label Height="36" Grid.Column="1" HorizontalAlignment="Left" Margin="20 0" Name="message" VerticalAlignment="Center" FontSize="20" />
        <Grid Width="35" Height="35">
            <Grid.Resources>
                <DrawingBrush x:Key="brush" Stretch="None" AlignmentX="Center" AlignmentY="Top">
                    <DrawingBrush.Drawing>
                        <GeometryDrawing Brush="Black">
                            <GeometryDrawing.Geometry>
                                <EllipseGeometry RadiusX="2" RadiusY="5"/>
                            </GeometryDrawing.Geometry>
                        </GeometryDrawing>
                    </DrawingBrush.Drawing>
                </DrawingBrush>
            </Grid.Resources>

            <Rectangle x:Name="r01" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="0"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r02" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="30"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r03" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="60"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r04" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="90"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r05" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="120"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r06" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="150"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r07" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="180"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r08" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="210"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r09" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="240"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r10" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="270"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r11" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="300"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r12" Fill="{StaticResource brush}" Opacity="0.2" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle="330"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Grid.Triggers>
                <EventTrigger RoutedEvent="Grid.Loaded">
                    <BeginStoryboard>
                        <Storyboard RepeatBehavior="Forever">
                            <DoubleAnimation Storyboard.TargetName="r01" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.00000" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r02" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.08333" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r03" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.16666" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r04" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.24999" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r05" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.33332" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r06" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.41665" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r07" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.49998" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r08" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.58331" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r09" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.66664" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r10" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.74997" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r11" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.83330" To="0"/>
                            <DoubleAnimation Storyboard.TargetName="r12" Storyboard.TargetProperty="Opacity" AutoReverse="True" Duration="0:0:0.08333" BeginTime="0:0:0.91663" To="0"/>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Grid.Triggers>
        </Grid>
    </Grid>
</Controls:MetroWindow>

.cs：

 /// <summary>
    /// Interaction logic for LoadDialog.xaml
    /// </summary>
    public partial class LoadDialog : MetroWindow
    {
        public LoadDialog()
        {
            InitializeComponent();

            //this.Topmost = true;    //始终保持最上层
        }

        public void SetProgressText(string desc)
        {
            //this.message.Content = desc;
            this.Dispatcher.Invoke(new Action(() =>
            {
                this.message.Content = desc;
            }));
        }
    }