Win8系统的Loading效果还是很不错的，网上也有人用CSS3等技术实现，研究了一下，并打算用WPF自定义一个Loading控件实现类似的效果，并可以让用户对Loading的颗粒（Particle）背景颜色进行自定义，话不多说，直接上代码：

1、用VS2012新建一个WPF的用户控件库项目WpfControlLibraryDemo，VS自动生成如下结构：

2、删除UserControl1.xaml，并新建一个Loading的CustomControl(不是UserControl),如下图所示：

3、如果报错找不到Loading类型，请编译，下面在Generic.xaml主题文件中对Loading的样式和内容进行定义（注意添加

xmlns:system = "clr-namespace:System;assembly=mscorlib"），代码如下：<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:system = "clr-namespace:System;assembly=mscorlib" xmlns:local="clr-namespace:WpfControlLibraryDemo"> <Style TargetType="{x:Type local:Loading}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type local:Loading}"> <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"> <Grid Width = "50" Height = "50"> <Grid.Resources> <!-- Value Converters --> <!-- Particle Styling ,must to has RelativeSource --> <SolidColorBrush x:Key = "ParticleColor" Color = "{Binding Path=FillColor,RelativeSource={RelativeSource TemplatedParent}}" /> <SolidColorBrush x:Key = "ParticleBackgroundColor" Color = "Transparent"/> <system:Double x:Key = "ParticleOpacity">1</system:Double> <system:Double x:Key = "ParticleRadius">5</system:Double> <system:Double x:Key = "StartingPointX">0</system:Double> <system:Double x:Key = "StartingPointY">-20</system:Double> <system:Double x:Key = "RotationPointX">0.5</system:Double> <system:Double x:Key = "RotationPointY">0.5</system:Double> <!-- StoryBoard --> <system:TimeSpan x:Key = "StoryBoardBeginTimeP0">00:00:00.000</system:TimeSpan> <system:TimeSpan x:Key = "StoryBoardBeginTimeP1">00:00:00.100</system:TimeSpan> <system:TimeSpan x:Key = "StoryBoardBeginTimeP2">00:00:00.200</system:TimeSpan> <system:TimeSpan x:Key = "StoryBoardBeginTimeP3">00:00:00.300</system:TimeSpan> <system:TimeSpan x:Key = "StoryBoardBeginTimeP4">00:00:00.400</system:TimeSpan> <Duration x:Key = "StoryBoardDuration">00:00:01.800</Duration> <!-- Particle Origin Angles --> <system:Double x:Key = "ParticleOriginAngleP0">0</system:Double> <system:Double x:Key = "ParticleOriginAngleP1">-10</system:Double> <system:Double x:Key = "ParticleOriginAngleP2">-20</system:Double> <system:Double x:Key = "ParticleOriginAngleP3">-30</system:Double> <system:Double x:Key = "ParticleOriginAngleP4">-40</system:Double> <!-- Particle Position & Timing 1 --> <system:Double x:Key = "ParticleBeginAngle1">0</system:Double> <system:Double x:Key = "ParticleEndAngle1">90</system:Double> <system:TimeSpan x:Key = "ParticleBeginTime1">00:00:00.000</system:TimeSpan> <Duration x:Key = "ParticleDuration1">00:00:00.750</Duration> <!-- Particle Position & Timing 2 --> <system:Double x:Key = "ParticleBeginAngle2">90</system:Double> <system:Double x:Key = "ParticleEndAngle2">270</system:Double> <system:TimeSpan x:Key = "ParticleBeginTime2">00:00:00.751</system:TimeSpan> <Duration x:Key = "ParticleDuration2">00:00:00.300</Duration> <!-- Particle Position & Timing 3 --> <system:Double x:Key = "ParticleBeginAngle3">270</system:Double> <system:Double x:Key = "ParticleEndAngle3">360</system:Double> <system:TimeSpan x:Key = "ParticleBeginTime3">00:00:01.052</system:TimeSpan> <Duration x:Key = "ParticleDuration3">00:00:00.750</Duration> <Style x:Key = "EllipseStyle" TargetType = "Ellipse"> <Setter Property = "Width" Value = "{StaticResource ParticleRadius}"/> <Setter Property = "Height" Value = "{StaticResource ParticleRadius}"/> <Setter Property = "Fill" Value = "{StaticResource ParticleColor}"/> <Setter Property = "RenderTransformOrigin" Value = "0.5, 0.5"/> <Setter Property = "Opacity" Value = "{StaticResource ParticleOpacity}"/> </Style> </Grid.Resources> <Canvas Width = "1" Height = "1" Margin="0,0,0,0"> <Canvas.Triggers> <EventTrigger RoutedEvent = "Canvas.Loaded"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard BeginTime = "{StaticResource StoryBoardBeginTimeP0}" Duration = "{StaticResource StoryBoardDuration}" RepeatBehavior = "Forever"> <DoubleAnimation Storyboard.TargetName = "p0" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle1}" To = "{StaticResource ParticleEndAngle1}" BeginTime = "{StaticResource ParticleBeginTime1}" Duration = "{StaticResource ParticleDuration1}"/> <DoubleAnimation Storyboard.TargetName = "p0" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle2}" To = "{StaticResource ParticleEndAngle2}" BeginTime = "{StaticResource ParticleBeginTime2}" Duration = "{StaticResource ParticleDuration2}"/> <DoubleAnimation Storyboard.TargetName = "p0" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle3}" To = "{StaticResource ParticleEndAngle3}" BeginTime = "{StaticResource ParticleBeginTime3}" Duration = "{StaticResource ParticleDuration3}"/> </Storyboard> </BeginStoryboard> <BeginStoryboard> <Storyboard BeginTime = "{StaticResource StoryBoardBeginTimeP1}" Duration = "{StaticResource StoryBoardDuration}" RepeatBehavior = "Forever"> <DoubleAnimation Storyboard.TargetName = "p1" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle1}" To = "{StaticResource ParticleEndAngle1}" BeginTime = "{StaticResource ParticleBeginTime1}" Duration = "{StaticResource ParticleDuration1}"/> <DoubleAnimation Storyboard.TargetName = "p1" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle2}" To = "{StaticResource ParticleEndAngle2}" BeginTime = "{StaticResource ParticleBeginTime2}" Duration = "{StaticResource ParticleDuration2}"/> <DoubleAnimation Storyboard.TargetName = "p1" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle3}" To = "{StaticResource ParticleEndAngle3}" BeginTime = "{StaticResource ParticleBeginTime3}" Duration = "{StaticResource ParticleDuration3}"/> </Storyboard> </BeginStoryboard> <BeginStoryboard> <Storyboard BeginTime = "{StaticResource StoryBoardBeginTimeP2}" Duration = "{StaticResource StoryBoardDuration}" RepeatBehavior = "Forever"> <DoubleAnimation Storyboard.TargetName = "p2" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle1}" To = "{StaticResource ParticleEndAngle1}" BeginTime = "{StaticResource ParticleBeginTime1}" Duration = "{StaticResource ParticleDuration1}"/> <DoubleAnimation Storyboard.TargetName = "p2" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle2}" To = "{StaticResource ParticleEndAngle2}" BeginTime = "{StaticResource ParticleBeginTime2}" Duration = "{StaticResource ParticleDuration2}"/> <DoubleAnimation Storyboard.TargetName = "p2" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle3}" To = "{StaticResource ParticleEndAngle3}" BeginTime = "{StaticResource ParticleBeginTime3}" Duration = "{StaticResource ParticleDuration3}"/> </Storyboard> </BeginStoryboard> <BeginStoryboard> <Storyboard BeginTime = "{StaticResource StoryBoardBeginTimeP3}" Duration = "{StaticResource StoryBoardDuration}" RepeatBehavior = "Forever"> <DoubleAnimation Storyboard.TargetName = "p3" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle1}" To = "{StaticResource ParticleEndAngle1}" BeginTime = "{StaticResource ParticleBeginTime1}" Duration = "{StaticResource ParticleDuration1}"/> <DoubleAnimation Storyboard.TargetName = "p3" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle2}" To = "{StaticResource ParticleEndAngle2}" BeginTime = "{StaticResource ParticleBeginTime2}" Duration = "{StaticResource ParticleDuration2}"/> <DoubleAnimation Storyboard.TargetName = "p3" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle3}" To = "{StaticResource ParticleEndAngle3}" BeginTime = "{StaticResource ParticleBeginTime3}" Duration = "{StaticResource ParticleDuration3}"/> </Storyboard> </BeginStoryboard> <BeginStoryboard> <Storyboard BeginTime = "{StaticResource StoryBoardBeginTimeP4}" Duration = "{StaticResource StoryBoardDuration}" RepeatBehavior = "Forever"> <DoubleAnimation Storyboard.TargetName = "p4" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle1}" To = "{StaticResource ParticleEndAngle1}" BeginTime = "{StaticResource ParticleBeginTime1}" Duration = "{StaticResource ParticleDuration1}"/> <DoubleAnimation Storyboard.TargetName = "p4" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle2}" To = "{StaticResource ParticleEndAngle2}" BeginTime = "{StaticResource ParticleBeginTime2}" Duration = "{StaticResource ParticleDuration2}"/> <DoubleAnimation Storyboard.TargetName = "p4" Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)" From = "{StaticResource ParticleBeginAngle3}" To = "{StaticResource ParticleEndAngle3}" BeginTime = "{StaticResource ParticleBeginTime3}" Duration = "{StaticResource ParticleDuration3}"/> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> </Canvas.Triggers> <Border x:Name = "p0" Background = "{StaticResource ParticleBackgroundColor}" Opacity = "{StaticResource ParticleOpacity}"> <Border.RenderTransform> <RotateTransform/> </Border.RenderTransform> <Border.RenderTransformOrigin> <Point X = "{StaticResource RotationPointX}" Y = "{StaticResource RotationPointY}"/> </Border.RenderTransformOrigin> <Ellipse Style = "{StaticResource EllipseStyle}"> <Ellipse.RenderTransform> <TransformGroup> <TranslateTransform X = "{StaticResource StartingPointX}" Y = "{StaticResource StartingPointY}"/> <RotateTransform Angle = "{StaticResource ParticleOriginAngleP0}"/> </TransformGroup> </Ellipse.RenderTransform> </Ellipse> </Border> <Border x:Name = "p1" Background = "{StaticResource ParticleBackgroundColor}" Opacity = "{StaticResource ParticleOpacity}"> <Border.RenderTransform> <RotateTransform/> </Border.RenderTransform> <Border.RenderTransformOrigin> <Point X = "{StaticResource RotationPointX}" Y = "{StaticResource RotationPointY}"/> </Border.RenderTransformOrigin> <Ellipse Style = "{StaticResource EllipseStyle}"> <Ellipse.RenderTransform> <TransformGroup> <TranslateTransform X = "{StaticResource StartingPointX}" Y = "{StaticResource StartingPointY}"/> <RotateTransform Angle = "{StaticResource ParticleOriginAngleP1}"/> </TransformGroup> </Ellipse.RenderTransform> </Ellipse> </Border> <Border x:Name = "p2" Background = "{StaticResource ParticleBackgroundColor}" Opacity = "{StaticResource ParticleOpacity}"> <Border.RenderTransform> <RotateTransform/> </Border.RenderTransform> <Border.RenderTransformOrigin> <Point X = "{StaticResource RotationPointX}" Y = "{StaticResource RotationPointY}"/> </Border.RenderTransformOrigin> <Ellipse Style = "{StaticResource EllipseStyle}"> <Ellipse.RenderTransform> <TransformGroup> <TranslateTransform X = "{StaticResource StartingPointX}" Y = "{StaticResource StartingPointY}"/> <RotateTransform Angle = "{StaticResource ParticleOriginAngleP2}"/> </TransformGroup> </Ellipse.RenderTransform> </Ellipse> </Border> <Border x:Name = "p3" Background = "{StaticResource ParticleBackgroundColor}" Opacity = "{StaticResource ParticleOpacity}"> <Border.RenderTransform> <RotateTransform/> </Border.RenderTransform> <Border.RenderTransformOrigin> <Point X = "{StaticResource RotationPointX}" Y = "{StaticResource RotationPointY}"/> </Border.RenderTransformOrigin> <Ellipse Style = "{StaticResource EllipseStyle}"> <Ellipse.RenderTransform> <TransformGroup> <TranslateTransform X = "{StaticResource StartingPointX}" Y = "{StaticResource StartingPointY}"/> <RotateTransform Angle = "{StaticResource ParticleOriginAngleP3}"/> </TransformGroup> </Ellipse.RenderTransform> </Ellipse> </Border> <Border x:Name = "p4" Background = "{StaticResource ParticleBackgroundColor}" Opacity = "{StaticResource ParticleOpacity}"> <Border.RenderTransform> <RotateTransform/> </Border.RenderTransform> <Border.RenderTransformOrigin> <Point X = "{StaticResource RotationPointX}" Y = "{StaticResource RotationPointY}"/> </Border.RenderTransformOrigin> <Ellipse Style = "{StaticResource EllipseStyle}"> <Ellipse.RenderTransform> <TransformGroup> <TranslateTransform X = "{StaticResource StartingPointX}" Y = "{StaticResource StartingPointY}"/> <RotateTransform Angle = "{StaticResource ParticleOriginAngleP4}"/> </TransformGroup> </Ellipse.RenderTransform> </Ellipse> </Border> </Canvas> </Grid> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary>

在构建中发现，一开始在设定绑定时，写成<SolidColorBrush x:Key = "ParticleColor" Color = "{Binding Path=FillColor}" />一直都无法绑定成功，后来查了资料，改成<SolidColorBrush x:Key = "ParticleColor" Color = "{Binding Path=FillColor,RelativeSource={RelativeSource TemplatedParent}}" /> 后成功。

4、编辑Loading.cs文件，对自定义属性FillColor和逻辑进行编码：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;namespace WpfControlLibraryDemo{ using System.ComponentModel; /// <summary> /// 按照步骤 1a 或 1b 操作，然后执行步骤 2 以在 XAML 文件中使用此自定义控件。 /// /// 步骤 1a) 在当前项目中存在的 XAML 文件中使用该自定义控件。 /// 将此 XmlNamespace 特性添加到要使用该特性的标记文件的根 /// 元素中: /// /// xmlns:MyNamespace="clr-namespace:WpfControlLibraryDemo" /// /// /// 步骤 1b) 在其他项目中存在的 XAML 文件中使用该自定义控件。 /// 将此 XmlNamespace 特性添加到要使用该特性的标记文件的根 /// 元素中: /// /// xmlns:MyNamespace="clr-namespace:WpfControlLibraryDemo;assembly=WpfControlLibraryDemo" /// /// 您还需要添加一个从 XAML 文件所在的项目到此项目的项目引用， /// 并重新生成以避免编译错误: /// /// 在解决方案资源管理器中右击目标项目，然后依次单击 /// “添加引用”->“项目”->[浏览查找并选择此项目] /// /// /// 步骤 2) /// 继续操作并在 XAML 文件中使用控件。 /// /// <MyNamespace:Loading/> /// /// </summary> public class Loading : Control { static Loading() { //重载默认样式 DefaultStyleKeyProperty.OverrideMetadata(typeof(Loading), new FrameworkPropertyMetadata(typeof(Loading))); //DependencyProperty 注册 FillColor FillColorProperty = DependencyProperty.Register("FillColor", typeof(Color), typeof(Loading), new UIPropertyMetadata(Colors.DarkBlue, new PropertyChangedCallback(OnUriChanged)) ); //Colors.DarkBlue为控件初始化默认值 } //属性变更回调函数 private static void OnUriChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { //Border b = (Border)d; //MessageBox.Show(e.NewValue.ToString()); } #region 自定义Fields // DependencyProperty属性定义 FillColorProperty=FillColor+Property组成 public static readonly DependencyProperty FillColorProperty; #endregion //VS设计器属性支持 [Description("背景色"), Category("个性配置"), DefaultValue("#FF668899")] public Color FillColor { //GetValue,SetValue为固定写法，此处一般不建议处理其他逻辑 get { return (Color)GetValue(FillColorProperty); } set { SetValue(FillColorProperty, value); } } }}

5、编译，如果无误后，可以添加WPF应用程序WpfAppLoadingTest进行测试（添加项目引用）。

打开MainWindow.xaml，将Loading控件拖放到设计界面上，如下图所示：

6、控件颜色修改，选中控件，在属性栏中进行配置即可：

7.总结

可以看到WPF自定义控件还是比较容易的，但是难点在于UI的设计，如果需要做的美观，需要美工的参与，而且需要转换成XAML。

以上就是WPF实现炫酷Loading控件的全部内容，希望对大家的学习有所帮助。