WPF，请看一下控件可视状态的代码

<Grid>        
        <Button Name="button2" MouseEnter="ColorChangeMouseEvent" MouseLeave="ColorChangeMouseEvent" Margin="198,17,0,0" Height="88" VerticalAlignment="Top" HorizontalAlignment="Left" Width="100">
            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup Name="MouseStates">
                    <VisualState Name="BlueState">
                        <Storyboard>
                            <ColorAnimation To="Blue" Storyboard.TargetName="rectBrush" Storyboard.TargetProperty="Color"/>
                        </Storyboard>
                    </VisualState>
                    <VisualState Name="OrangeState">
                        <Storyboard>
                            <ColorAnimation To="Orange" Storyboard.TargetName="rectBrush" Storyboard.TargetProperty="Color"/>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>
            <Button.Background>
                <SolidColorBrush x:Name="rectBrush" Color="Orange"/> 
 
            </Button.Background>
        </Button>
    </Grid>

  private void ColorChangeMouseEvent(object sender, MouseEventArgs e) 
        { 
            if (button2.IsMouseOver) 
            {
                VisualStateManager.GoToElementState(button2, "BlueState", true);
            }
            else 
            {
                VisualStateManager.GoToElementState(button2, "OrangeState", true); 
            }
        }　　

问题：
当鼠标移到按钮上时，是突然变成绿色的，而移开按钮时，却是渐变成桔色的。都是线性插值动画，为什么鼠标移到按钮上不是渐变成绿色的呢？
[解决办法]
看看原色是什么，估计是到绿色的渐变不明显。
[解决办法]

            <Button.Background>
                <SolidColorBrush x:Name="rectBrush" Color="Orange"/>
            </Button.Background>

看到了，你把两个颜色换过来试试
[解决办法]
button有自己的鼠标渐变效果，要禁用掉它原来的渐变效果，你的效果才看得出。
在button里加一段template模板：

        <Button Name="button2" MouseEnter="ColorChangeMouseEvent" MouseLeave="ColorChangeMouseEvent" Margin="198,17,0,0" Height="88" VerticalAlignment="Top" HorizontalAlignment="Left" Width="100"> 
 
            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup Name="MouseStates">
                    <VisualState Name="BlueState">
                        <Storyboard>
                            <ColorAnimation To="Blue" Storyboard.TargetName="rectBrush" Storyboard.TargetProperty="Color"/>
                        </Storyboard>
                    </VisualState>
                    <VisualState Name="OrangeState">
                        <Storyboard>
                            <ColorAnimation To="Orange" Storyboard.TargetName="rectBrush" Storyboard.TargetProperty="Color"/>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>
            <Button.Background>
                <SolidColorBrush x:Name="rectBrush" Color="Orange"/>
            </Button.Background>
            <Button.Template>
                <ControlTemplate>
                    <Border Background="{TemplateBinding Background}"> 
 
                        <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
                    </Border>
                </ControlTemplate>
            </Button.Template>
        </Button>