Question

我有一个带主题的WPF应用程序（ShinyRed.xaml），我希望有一个按钮，点击后将主题更改为ShinyBlue.xaml

我最初在App.xaml中加载主题：

<Application.Resources>
    <ResourceDictionary Source="/Themes/ShinyBlue.xaml"/>
</Application.Resources>

我该怎么做？

Answer 1

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary x:Name="ThemeDictionary">
                <ResourceDictionary.MergedDictionaries>
                    <ResourceDictionary Source="/Themes/ShinyRed.xaml"/>
                </ResourceDictionary.MergedDictionaries>
            </ResourceDictionary>
        </ResourceDictionary.MergedDictionaries>
    <!-- ... -->

public partial class App : Application
{
    public ResourceDictionary ThemeDictionary
    {
        // You could probably get it via its name with some query logic as well.
        get { return Resources.MergedDictionaries[0]; }
    }

    public void ChangeTheme(Uri uri)
    {
        ThemeDictionary.MergedDictionaries.Clear();
        ThemeDictionary.MergedDictionaries.Add(new ResourceDictionary() { Source = uri });
    }

    //...
}

在您的更改方法中：

var app = (App)Application.Current;
app.ChangeTheme(new Uri("New Uri here"));

Answer 2

这篇文章将引导您完成它：

http://svetoslavsavov.blogspot.com/2009/07/switching-wpf-interface-themes-at.html

基本上你需要从资源字典中删除“旧”主题，然后合并到新主题中。上面的文章向您展示了如何使这一变化变得非常简单。

Answer 3

我使用以下命令在运行时设置主题：

Application.Current.Resources.Source = new Uri("/Themes/ShinyRed.xaml", UriKind.RelativeOrAbsolute);

Answer 4

的App.xaml

    <Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Themes/Font.xaml" />
            <ResourceDictionary Source="Themes/Light.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

在您的代码中：

> Application.Current.Resources.MergedDictionaries[1].Source = new Uri("Themes/Dark.xaml", UriKind.RelativeOrAbsolute);

你可以检查这一点，以确保没有增长

Application.Current.Resources.MergedDictionaries.Count.ToString();

Answer 5

H.B.的回答没有针对我，我必须这样做（工作，测试）：

Uri dictUri = new Uri(@"/Resources/Themes/MyTheme.xaml", UriKind.Relative);
ResourceDictionary resourceDict = Application.LoadComponent(dictUri) as ResourceDictionary;
Application.Current.Resources.MergedDictionaries.Clear();
Application.Current.Resources.MergedDictionaries.Add(resourceDict);

要搞清楚：

// Place in App.xaml.cs
public void ChangeTheme(Uri uri)
{
    ResourceDictionary resourceDict = Application.LoadComponent(uri) as ResourceDictionary;
    Application.Current.Resources.MergedDictionaries.Clear();
    Application.Current.Resources.MergedDictionaries.Add(resourceDict);
}

// Example Usage (anywhere in app)
private void ThemeRed_Click(object sender, RoutedEventArgs e)
{
    var app = App.Current as App;
    app.ChangeTheme(new Uri(@"/Resources/Themes/RedTheme.xaml", UriKind.Relative));      
}

在运行时更改主题

5 个答案: