wpf 更改样式中的 setter 值
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change setter value in style
提问by Babak.Abad
I'm programming in WPF(c#). I'm trying to change value in a setter of style.
我正在用 WPF(c#) 编程。我正在尝试以一种风格改变价值。
my style is:
我的风格是：
<Style TargetType="Control" x:Key="st">
<Setter Property="FontFamily" Value="Tahoma"/>
<Setter Property="FontSize" Value="14"/>
</Style>
and I use it in a button:
我在一个按钮中使用它：
<Button x:Name="btnCancel" Style="{StaticResource st}" Content="??????" Canvas.Left="30" Canvas.Top="18" Width="139" Height="53" FontFamily="2 badr" FlowDirection="LeftToRight" Click="btnCancel_Click_1" />
and what I try to do is this code:
我试图做的是这段代码：
Style style = new Style();
style = (Style) Resources["st"];
Setter setter =(Setter) style.Setters[1];
setter.Value = 30;
after setting font size to 30I get this error?
将字体大小设置为30我收到此错误后？
After a “SetterCollectionBase” is in use (sealed), it cannot be modified
“SetterCollectionBase”在使用（密封）后不能修改
How can I solve this problem?
我怎么解决这个问题？
采纳答案by 123 456 789 0
Since you are doing pure UI and behind the code while some answers recommend you to use MVVM which will really make a lot of things easier.
由于您正在做纯 UI 并在代码背后，而一些答案建议您使用 MVVM，这确实会让很多事情变得更容易。
Why do you need to manipulate the Style? Is it just for the button and you want to manipulate its FontSize? I assume you are doing this on the Click event of the button where it changes the fontsize.
为什么需要操纵 Style？是否仅用于按钮而您想操作其 FontSize？我假设您是在更改字体大小的按钮的 Click 事件上执行此操作。
Try this then
然后试试这个
private void btnCancel_Click_1(object sender, RoutedEventArgs e)
{
var button = sender as Button;
if (button != null) button.FontSize = 30;
}
回答by seddik
The styles can be set only once (sealed after compiling), you can't change it with code
样式只能设置一次（编译后密封），不能用代码更改
so the solutions are
所以解决方案是
create a style by code
Style st = new Style(typeof(System.Windows.Controls.Control)); st.Setters.Add(new Setter(Control.FontFamilyProperty, new FontFamily("Tahoma"))); st.Setters.Add(new Setter(Control.FontSizeProperty, 14.0));
通过代码创建样式
Style st = new Style(typeof(System.Windows.Controls.Control)); st.Setters.Add(new Setter(Control.FontFamilyProperty, new FontFamily("Tahoma"))); st.Setters.Add(new Setter(Control.FontSizeProperty, 14.0));
later you can change it
以后你可以改变它
st.Setters.OfType<Setter>().FirstOrDefault(X => X.Property == Control.FontSizeProperty).Value = 30.0;//safer than Setters[1]
or
或者
change the property directly
btnCancel.FontSize=30.0;
直接修改属性
btnCancel.FontSize=30.0;
回答by Mark Feldman
You'll need to create a view model, something like this (I'm using the MVVM Lite class ViewModelBase, you just need something that supports property change notification):
你需要创建一个视图模型，像这样（我使用的是 MVVM Lite 类 ViewModelBase，你只需要支持属性更改通知的东西）：
public class MyViewModel : ViewModelBase
{
private double _FontSize = 0.0;
public double FontSize
{
get { return this._FontSize; }
set { this._FontSize = value; RaisePropertyChanged(() => this.FontSize); }
}
}
Then create an instance of it in your window along with a getter:
然后在您的窗口中创建它的一个实例以及一个 getter：
public partial class Window1 : Window
{
public MyViewModel MyViewModel {get; set;}
public Window1()
{
InitializeComponent();
this.MyViewModel = new MyViewModel { FontSize = 80 };
}
}
And then finally you need to bind your style to use the value in the view model:
最后，您需要绑定您的样式以使用视图模型中的值：
<Window.Resources>
<Style TargetType="Control" x:Key="st">
<Setter Property="FontFamily" Value="Tahoma"/>
<Setter Property="FontSize" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Window}, Path=MyViewModel.FontSize}"/>
</Style>
</Window.Resources>
