C# 在 WPF 中在运行时更改样式
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Changing the styles at runtime in WPF
提问by ds345
I am trying to allow the user to customize the elements in a WPF application. What I am trying to achieve is, if I have a list box which specifies all the form elements (TextBox, label etc.) user can pick one form element, and set the style property say Label, foreground should be in orange where as for TextBox foreground should be in black and so on. And as per what ever style I am intending to apply all the TextBoxes should look alike.
我试图允许用户自定义 WPF 应用程序中的元素。我想要实现的是，如果我有一个指定所有表单元素（文本框、标签等）的列表框，用户可以选择一个表单元素，并设置样式属性说标签，前景应该是橙色的，至于TextBox 前景应该是黑色等等。根据我打算应用的任何样式，所有文本框都应该看起来相似。
I am not able to go figure out a way for achieving this. I have tried out an example where multiple pre-defined styles can be uploaded at runtime. So now, I would like to find a way of changing the property of different elements at runtime.
我无法找出实现这一目标的方法。我尝试了一个示例，其中可以在运行时上传多个预定义的样式。所以现在，我想找到一种在运行时更改不同元素属性的方法。
UPDATE:
UPDATE:
I tried to create a new style from the code behind.
我试图从背后的代码中创建一种新的样式。
XAML
XAML
<Label Content="SAMPLE" Style="{DynamicResource Style1}" x:Name="label1" />
<Button Content="Button" Click="Button_Click" />
and in code behind i.e. on click of the Button I tried this:
在后面的代码中，即单击按钮时，我尝试了以下操作：
Style style = new Style { TargetType = typeof(Label) };
style.Setters.Add(new Setter(Control.ForegroundProperty, Brushes.Black));
Application.Current.Resources["Style1"] = style;
But it is not getting updated.
但它没有得到更新。
Thanks.
谢谢。
采纳答案by Anatoliy Nikolaev
You have to make sure that the styles are in the file App.xaml:
您必须确保样式在文件中App.xaml：
<Application x:Class="ChangeStyleHelp.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml">
<Application.Resources>
<Style x:Key="MyStyle" TargetType="{x:Type Label}">
<Setter Property="Background" Value="Green" />
</Style>
</Application.Resources>
</Application>
Code behind:
后面的代码：
private void ChangeStyle_Click(object sender, RoutedEventArgs e)
{
Style style = new Style
{
TargetType = typeof(Label)
};
style.Setters.Add(new Setter(Label.BackgroundProperty, Brushes.Aquamarine));
Application.Current.Resources["MyStyle"] = style;
}
If the Styleis in the resource of Window(Window.Resources), then you need to write this, or the name of the Window:
如果Style是在Window( Window.Resources)的资源中，那么你需要写this，或者是 的名字Window：
private void ChangeStyle_Click(object sender, RoutedEventArgs e)
{
Style style = new Style
{
TargetType = typeof(Label)
};
style.Setters.Add(new Setter(Label.BackgroundProperty, Brushes.Aquamarine));
this.Resources["MyStyle"] = style;
}
As well, you can change the Stylethis way: take an existing style and use of the element. Example:
同样，您可以通过Style这种方式更改：采用现有样式并使用元素。例子：
<Application x:Class="ChangeStyleHelp.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml">
<Application.Resources>
<Style x:Key="AnotherWayStyle" TargetType="{x:Type Label}">
<Setter Property="Background" Value="Lavender" />
<Setter Property="Foreground" Value="OrangeRed" />
</Style>
</Application.Resources>
</Application>
Code behind:
后面的代码：
private void AnotherWay_Click(object sender, RoutedEventArgs e)
{
label1.Style = (Style)Application.Current.Resources["AnotherWayStyle"];
}
回答by Sylens
Have you tried using Resource Dictionaries
您是否尝试过使用资源字典
Resource Dictionary
资源字典
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<SolidColorBrush x:Key="TextColor" Color="#FF121212"/>
</ResourceDictionary>
XAML for the control
控件的 XAML
<TextBox Text="TextBox" Foreground="{DynamicResource TextColor}" />
Code to change styles at runtime
在运行时更改样式的代码
var rd = new ResourceDictionary();
rd.Add("TextColor", "#FFFFFF");
Application.Current.Resources.MergedDictionaries.Add(rd);
This will merge your new styles with the existing ones, and the change will be automatically reflected on all the controls linked with those styles.
这会将您的新样式与现有样式合并，并且更改将自动反映在与这些样式链接的所有控件上。
回答by Darío Andrés Mu?oz Prudant
it worked for me like a charm:
它对我很有用：
Xaml:
Xml：
<TreeView x:Name="TreePeople">
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="True" />
</Style>
</TreeView.ItemContainerStyle>
</TreeView>
c#:
C＃：
bool Expanded = false;
// The event subscription method (for a button click)
private void ButtonExpand__Click(object sender, RoutedEventArgs e)
{
Expanded = !Expanded;
Style Style = new Style
{
TargetType = typeof(TreeViewItem)
};
Style.Setters.Add(new Setter(TreeViewItem.IsExpandedProperty, Expanded));
TreePeople.ItemContainerStyle = Style;
}
