【WPF】实现加载中动画效果

参考自：

https://blog.csdn.net/zhumingyan/article/details/50294905

后台代码：

BackgroundWorker bgMeet;

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            bgMeet = new BackgroundWorker();
            //能否报告进度更新
            bgMeet.WorkerReportsProgress = true;
            //要执行的后台任务
            bgMeet.DoWork += new DoWorkEventHandler(bgMeet_DoWork);
            //进度报告方法
            bgMeet.ProgressChanged += new ProgressChangedEventHandler(bgMeet_ProgressChanged);
            //后台任务执行完成时调用的方法
            bgMeet.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bgMeet_RunWorkerCompleted);
            bgMeet.RunWorkerAsync(); //任务启动
        }
        //执行任务
        void bgMeet_DoWork(object sender, DoWorkEventArgs e)
        {
            //开始播放等待动画
            this.Dispatcher.Invoke(new Action(() =>
            {
                loading.Visibility = System.Windows.Visibility.Visible;
            }));
            //开始后台任务
            GetData();
        }
        //报告任务进度
        void bgMeet_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.Dispatcher.Invoke(new Action(() =>
            {
                this.lab_pro.Content = e.ProgressPercentage + "%";
            }));
        }
        //任务执行完成后更新状态
        void bgMeet_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            loading.Visibility = System.Windows.Visibility.Collapsed;
            this.Dispatcher.Invoke(new Action(() =>
            {
                this.lab_pro.Content = "完成";
            }));
        }
        //模拟耗时任务
        public void GetData()
        {
            for (int i = 0; i < 6; i++)
            {
                bgMeet.ReportProgress(20 * i);
                System.Threading.Thread.Sleep(400);
            }
        }

前端代码：

<Window x:Class="loading.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:loading"
        mc:Ignorable="d"
        Title="后台忙" Height="94.635" Width="197.361">
    <!--<Grid>
        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="41,20,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
        <DataGrid AutoGenerateColumns="False" Height="99" HorizontalAlignment="Left" Margin="40,70,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="441" />
        <Canvas Name="loading" RenderTransformOrigin="0.5,0.5" Visibility="Collapsed" HorizontalAlignment="Center" VerticalAlignment="Center" Width="120" Height="120" Margin="187,76,241,85">
            <Ellipse Width="15" Height="15" Canvas.Left="55" Canvas.Top="31" Stretch="Fill" Fill="#FFD1D1F7" Opacity="1.0"/>
            <Ellipse Width="15" Height="15" Canvas.Left="38" Canvas.Top="39" Stretch="Fill" Fill="Blue" Opacity="0.8"/>
            <Ellipse Width="15" Height="15" Canvas.Left="36" Canvas.Top="58" Stretch="Fill" Fill="#FF0000FE" Opacity="0.7"/>
            <Ellipse Width="15" Height="15" Canvas.Left="52" Canvas.Top="67" Stretch="Fill" Fill="Blue" Opacity="0.6"/>
            <Ellipse Width="15" Height="15" Canvas.Left="68" Canvas.Top="61" Stretch="Fill" Fill="#FF2E2EFF" Opacity="0.5"/>
            <Ellipse Width="15" Height="15" Canvas.Left="69" Canvas.Top="42" Stretch="Fill" Fill="#FF6F6FFF" Opacity="0.4"/>
            <Canvas.RenderTransform>
                <RotateTransform x:Name="SpinnerRotate" Angle="0" />
            </Canvas.RenderTransform>
            <Canvas.Triggers>
                <EventTrigger RoutedEvent="ContentControl.Loaded">
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetName="SpinnerRotate" Storyboard.TargetProperty="(RotateTransform.Angle)" From="0" To="360" Duration="0:0:0.8" RepeatBehavior="Forever" />
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Canvas.Triggers>
        </Canvas>
        <Label Name="lab_pro" Content="Label" Height="28" Margin="140,14,315,239" />
    </Grid>-->
    <Grid >
        <Button Content ="开始" HorizontalAlignment="Left" Margin="10,10,0,0" Name ="button1" VerticalAlignment="Top" Click="button1_Click" Width ="48" />
        <Label Name ="lab_pro" Content="" Height="25" VerticalAlignment ="Top" HorizontalAlignment="Left" Margin="80,20,0,0" />
        <!--动画代码，只要填写name属性即可-->
        <Grid Name ="loading" Visibility="Collapsed" Height="41" Grid.Row ="0" VerticalAlignment="Top" Margin="126,10,0,0" HorizontalAlignment="Left" Width ="42">
            <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 ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="0"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r02" Fill="{StaticResource brush}" Opacity ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="30"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r03" Fill="{StaticResource brush}" Opacity ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="60"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r04" Fill="{StaticResource brush}" Opacity ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="90"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r05" Fill="{StaticResource brush}" Opacity ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="120"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r06" Fill="{StaticResource brush}" Opacity ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="150"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r07" Fill="{StaticResource brush}" Opacity ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="180"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r08" Fill="{StaticResource brush}" Opacity ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="210"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r09" Fill="{StaticResource brush}" Opacity ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="240"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r10" Fill="{StaticResource brush}" Opacity ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="270"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r11" Fill="{StaticResource brush}" Opacity ="0.5" RenderTransformOrigin="0.5,0.5">
                <Rectangle.RenderTransform>
                    <RotateTransform Angle ="300"/>
                </Rectangle.RenderTransform>
            </Rectangle>
            <Rectangle x:Name="r12" Fill="{StaticResource brush}" Opacity ="0.5" 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 >
</Window>