WPF 内部Template 动画板 无法冻结此 Storyboard 时间线树供跨线程使用

解决此问题，需要一定的想象力。

换个思路即可

大体是

使用Tag或者别无用的可以输入数值的属性，或者附加属性也可以的。来绑定到你要动画的属性

当然这个过程中要使用转换器了

我给出一个关于Button 的Width的内部模板小栗子，各位朋友可以针对自己的项目/控件进行修改

XAML代码

    <Window.Resources>
        <local:ToCon x:Key="To"/>
        <Style x:Key="FocusVisual">
            <Setter Property="Control.Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Rectangle Margin="2" SnapsToDevicePixels="true" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <SolidColorBrush x:Key="Button.Static.Background" Color="#FFDDDDDD"/>
        <SolidColorBrush x:Key="Button.Static.Border" Color="#FF707070"/>
        <SolidColorBrush x:Key="Button.MouseOver.Background" Color="#FFBEE6FD"/>
        <SolidColorBrush x:Key="Button.MouseOver.Border" Color="#FF3C7FB1"/>
        <SolidColorBrush x:Key="Button.Pressed.Background" Color="#FFC4E5F6"/>
        <SolidColorBrush x:Key="Button.Pressed.Border" Color="#FF2C628B"/>
        <SolidColorBrush x:Key="Button.Disabled.Background" Color="#FFF4F4F4"/>
        <SolidColorBrush x:Key="Button.Disabled.Border" Color="#FFADB2B5"/>
        <SolidColorBrush x:Key="Button.Disabled.Foreground" Color="#FF838383"/>
        <Style x:Key="ButtonStyle1" TargetType="{x:Type Button}">
            <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}"/>
            <Setter Property="Background" Value="{StaticResource Button.Static.Background}"/>
            <Setter Property="BorderBrush" Value="{StaticResource Button.Static.Border}"/>
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="Padding" Value="1"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <ControlTemplate.Resources>
                            <local:ToCon  x:Key="ToConHeight"/>
                        </ControlTemplate.Resources>
                        <Border  Height="{Binding Tag,RelativeSource={RelativeSource Mode=Self},  Converter={ StaticResource ToConHeight }}" x:Name="border"  BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
                            <Border.Tag>
                                <Binding Path="Tag" RelativeSource="{RelativeSource Mode=TemplatedParent}" Converter="{StaticResource ToConHeight }"/>
                            </Border.Tag>
                            <ContentPresenter x:Name="contentPresenter" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsDefaulted" Value="true">
                                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                            </Trigger>
                            <Trigger Property="IsMouseOver" Value="true">
                                <Trigger.EnterActions>
                                    <BeginStoryboard>
                                        <Storyboard>
                                            <DoubleAnimation  Storyboard.TargetProperty="Tag" To="200" Duration="0:0:2"/>
                                        </Storyboard>
                                    </BeginStoryboard>
                                </Trigger.EnterActions>
                            </Trigger>
                            <Trigger Property="IsPressed" Value="true">
                                <Setter Property="Background" TargetName="border" Value="{StaticResource Button.Pressed.Background}"/>
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.Pressed.Border}"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Background" TargetName="border" Value="{StaticResource Button.Disabled.Background}"/>
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.Disabled.Border}"/>
                                <Setter Property="TextElement.Foreground" TargetName="contentPresenter" Value="{StaticResource Button.Disabled.Foreground}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
    <Grid>
        <Button Style="{DynamicResource ButtonStyle1}" Tag="{Binding Width ,
            RelativeSource={RelativeSource Mode=Self},
            Converter={StaticResource ResourceKey=To}}" Width="100" Background="Red">

        </Button>
    </Grid>

转换器

    public class ToCon : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null)
                return 0;
            return  double.Parse(value.ToString());
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value.ToString();
        }
    }
}

截图