c# - My resource dictionary is omitting my label from being showed
问题描述
I have a wpf app and I am messing with loading themes (light and dark), I made two simple resource dictionary files which are created in a shared assembly:
Dark Theme (same structure for the light theme, but with different color values):
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<SolidColorBrush Color="#FF1E1E1E" x:Key="Background"/>
<SolidColorBrush x:Key="TextColorBrush" Color="White"/>
<Style TargetType="TextBlock">
<Setter Property="Foreground" Value="{StaticResource TextColorBrush}"/>
</Style>
<Style TargetType="Grid">
<Setter Property="Background" Value="{StaticResource Background}"/>
</Style>
</ResourceDictionary>
In my main application, App.xaml I am referencing my 2 theme dictionaries as such
<Application x:Class="Foo.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/Foo.Core.WPF;component/Resources/Dictionary_DarkTheme.xaml" x:Name="DarkTheme"/>
<ResourceDictionary Source="pack://application:,,,/Foo.Core.WPF;component/Resources/Dictionary_LightTheme.xaml" x:Name="LightTheme"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
The way I am setting up the resources based on which theme I am choosing is done in the App.xaml.cs
public enum Skin { Light, Dark }
/// <summary>
/// Interaction logic for App.xaml
/// </summary>
public partial class App : Application
{
public static Skin Skin { get; set; }
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
ChangeSkin(Skin.Light);
}
public void ChangeSkin(Skin newSkin)
{
Skin = newSkin;
if (Skin == Skin.Dark)
ApplyResources(Resources.MergedDictionaries[0].Source.ToString());
else if (Skin == Skin.Light)
ApplyResources(Resources.MergedDictionaries[1].Source.ToString());
}
private void ApplyResources(string src)
{
var dict = new ResourceDictionary() { Source = new Uri(src, UriKind.RelativeOrAbsolute) };
foreach (var mergeDict in dict.MergedDictionaries)
{
Resources.MergedDictionaries.Add(mergeDict);
}
foreach (var key in dict.Keys)
{
Resources[key] = dict[key];
}
}
}
And finally, my main window. Since I want these particular styles to be global I am not using any keys to identify them.
<Window x:Class="Foo.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid>
<Label Content="hello"/>
</Grid>
</Window>
But my main issue is that the Label control doesn't show up in my application. I can see my background change color appropriately but my label control is just gone! What am I doing wrong? Many thanks in advance!
解决方案
不要将所有主题 ResourceDictionaries 从开头添加到Application.Resources.MergedDictionaries
,即以空开头Application.Resources
:
<Application x:Class="Foo.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml">
<Application.Resources>
</Application.Resources>
</Application>
然后通过替换Application.Current.Resources.MergedDictionaries
为当前主题来更改主题:
private void ChangeSkin(Skin skin)
{
ResourceDictionary theme = null;
switch (skin)
{
case Skin.Light:
theme = new ResourceDictionary { Source = new Uri("pack://application:,,,/Foo.Core.WPF;component/Resources/Dictionary_LightTheme.xaml") };
break;
case Skin.Dark:
theme = new ResourceDictionary { Source = new Uri("pack://application:,,,/Foo.Core.WPF;component/Resources/Dictionary_DarkTheme.xaml") };
break;
}
if (theme != null)
{
Application.Current.Resources.MergedDictionaries.Clear();
Application.Current.Resources.MergedDictionaries.Add(theme);
}
}
当更改主题仅意味着替换颜色和画笔时,您还可以将样式移动到样式设置器中Application.Resources
并DynamicResource
在其中使用。
<Application x:Class="Foo.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 TargetType="TextBlock">
<Setter Property="Foreground" Value="{DynamicResource TextColorBrush}"/>
</Style>
<Style TargetType="Grid">
<Setter Property="Background" Value="{DynamicResource Background}"/>
</Style>
</Application.Resources>
</Application>
那么你的主题 ResourceDictionaries 将只包含 Color 和 Brush 资源:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<SolidColorBrush Color="#FF1E1E1E" x:Key="Background"/>
<SolidColorBrush x:Key="TextColorBrush" Color="White"/>
</ResourceDictionary>
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