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>
来源：https://www.cnblogs.com/yhnet/p/12517682.html