在 WPF 中动态更改样式
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Change a style dynamically in WPF
提问by serhio
Is there a way to change(and apply) a style dynamically in WPF?
有没有办法在 WPF 中动态更改（和应用）样式？
Say I have the style declared in XAML:
假设我在 XAML 中声明了样式：
<Style TargetType="local:MyLine"
x:Key="MyLineStyleKey" x:Name="MyLineStyleName">
<Setter Property="Fill" Value="Pink"/>
<Style.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Fill" Value="Blue" />
</Trigger>
</Style.Triggers>
</Style>
In a moment, I need to changethe
Pinkcolor, to, sayGreen, and all lines with styleMyLineStyleKeybecame Green. A line is Pink when released, and Blue when selected... Now, I needed to change the unselected property(Pink to Green)..., so this is not just setting it to an other color, the trigger (selection>Blue) will not work anymore...Is that possible? How?Is that possible to bindto the Pink color in the Style, say, to a Button background, that will reflect the currently used style color?
稍后，我需要将颜色更改
Pink为，例如Green，所有带有样式的线条都MyLineStyleKey变为绿色。释放时一条线是粉红色，选中时为蓝色...现在，我需要更改未选中的属性（粉红色到绿色）...，所以这不仅仅是将其设置为其他颜色，触发器（选择>蓝色） ) 将不再起作用......这可能吗？如何？是否可以绑定到样式中的粉红色，例如按钮背景，以反映当前使用的样式颜色？
EDIT:
For 1I tried:
编辑：
对于1我试过：
Style s = (Style)this.Resources["MyLineStyleKey"];
(s.Setters[0] as Setter).Value = background;
(s.Setters[1] as Setter).Value = background;
but an exception occured:
但是出现了异常：
After a 'SetterBase' is in use (sealed), it cannot be modified.
'SetterBase' 使用（密封）后，将无法修改。
回答by Isak Savo
Create a brush as a resource
创建画笔作为资源
<SolidColorBrush x:Key="MyFillBrush" Color="Pink" />
and refer to that in your style
并以你的风格参考
<Style x:Key="MyShapeStyle" TargetType="Shape">
<Setter Property="Fill" Value="{DynamicResource MyFillBrush}" />
</Style>
...
<!-- Then further down you may use it like this -->
<StackPanel Width="100">
<Rectangle Style="{StaticResource MyShapeStyle}" Height="50" Margin="8" />
<Rectangle Style="{StaticResource MyShapeStyle}" Height="50" Margin="8" />
<Ellipse Style="{StaticResource MyShapeStyle}" Height="50" Margin="8" />
<Button Content="Click to change color" Click="Button_Click" Margin="8" />
</StackPanel>
Now to change the color of all shapes that use the "MyShapeStyle" style, you can do the following from your code-behind:
现在要更改使用“MyShapeStyle”样式的所有形状的颜色，您可以从代码隐藏执行以下操作：
private void Button_Click(object sender, RoutedEventArgs e)
{
Random r = new Random();
this.Resources["MyFillBrush"] = new SolidColorBrush(Color.FromArgb(
0xFF,
(byte)r.Next(255),
(byte)r.Next(255),
(byte)r.Next(255)));
}
The thing that makes this work is the fact that you use a DynamicResourcefor the brush reference in your style - this tells WPF to monitor that resource for changes. If you use a StaticResourceinstead, you won't get this behavior.
使这项工作有效的原因是您DynamicResource在样式中使用了画笔参考 - 这告诉 WPF 监视该资源的更改。如果您使用 aStaticResource代替，您将不会得到这种行为。
回答by Thomas Levesque
A style can only be modified before its first use. From MSDN:
样式只能在第一次使用之前修改。来自 MSDN：
A style is sealed when another style is based on it or when it is applied for the first time.
当另一种样式基于它或第一次应用时，该样式将被密封。
Instead, you could create a new style based on your existing style, and override the properties you want:
相反，您可以根据现有样式创建新样式，并覆盖所需的属性：
Style newStyle = new Style();
newStyle.BasedOn = originalStyle;
newStyle.TargetType = typeof(MyLine);
Brush blue = new SolidColorBrush(Colors.Blue);
newStyle.Setters.Add(new Setter(Shape.FillProperty, blue));
newStyle.Setters.Add(new Setter(Shape.StrokeProperty, blue));
