https://github.com/vjpr/healthkick/blob/master/src/win/healthkick/ucSpinnerCogs.xaml
網上的例子，放在UserControl裡
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Castor project 放在 Windows裡 <Window x:Class="Halliburton.Castor.Dialogs.LoadingSpinnerWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="LoadingSpinnerWindow" AllowsTransparency="True" Background="{x:Null}" Opacity="0.695" ResizeMode="NoResize" ShowInTaskbar="False" SizeToContent="WidthAndHeight" Topmost="True" WindowStartupLocation="CenterOwner" WindowStyle="None"> <Window.Resources> <Storyboard x:Key="loading" RepeatBehavior="Forever"> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="path" Storyboard.TargetProperty="(UIElement.Opacity)"> <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0" /> <SplineDoubleKeyFrame KeyTime="00:00:00.2000000" Value="1" /> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="path1" Storyboard.TargetProperty="(UIElement.Opacity)"> <SplineDoubleKeyFrame KeyTime="00:00:00.4000000" Value="0" /> 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