如何动态更改 ResourceDictionary [英] How to change ResourceDictionary Dynamically

问题描述

我需要动态更改 App.xaml 文件中的 ResourceDictionary.我尝试了以下代码:

I need to change ResourceDictionary in App.xaml file dynamically. I have tried the following code:

ResourceDictionary newRes = new ResourceDictionary();
newRes.Source = new Uri("/PsyboInventory;component/TitleBarResource.xaml", UriKind.RelativeOrAbsolute);
this.Resources.MergedDictionaries.Clear();
this.Resources.MergedDictionaries.Add(newRes);

没有错误，但主题没有改变

There is no error, but the theme not change

推荐答案

点击按钮可以编写这段代码

In button click you can write this code

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

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

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 });
        } 

    }   

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

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