WPF用C#代码实现设置Border颜色的渐变

ColorAnimation colorAnimation = 
    new ColorAnimation((Color)ColorConverter.ConvertFromString("#BFBFBF"), 
    (Color)ColorConverter.ConvertFromString("#00B1EF"), 
    new Duration(TimeSpan.FromSeconds(0.2)));
border1.Background.BeginAnimation(SolidColorBrush.ColorProperty, colorAnimation);