1、新建两个资源字典文件zh-CN.xaml和en-US.xaml，分别存储中文模板和英文模板

(1) zh-CN.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:sys="clr-namespace:System;assembly=mscorlib"><sys:String x:Key="labelLanguage">语言:</sys:String><sys:String x:Key="comboEnglish">英语</sys:String><sys:String x:Key="comboChinese">中文</sys:String><sys:String x:Key="BtnContent">确定</sys:String><sys:String x:Key="textboxContent">这是语言切换测试文本内容</sys:String>
</ResourceDictionary>

(2) en-US.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:sys="clr-namespace:System;assembly=mscorlib"><sys:String x:Key="labelLanguage">Language:</sys:String><sys:String x:Key="comboEnglish">English</sys:String><sys:String x:Key="comboChinese">Chinese</sys:String><sys:String x:Key="BtnContent">OK</sys:String><sys:String x:Key="textboxContent">This is the language switching test text content.</sys:String>
</ResourceDictionary>

2、在App.xaml文件内，引入默认使用的语言对应的资源字典，在此默认语言为中文

<Application x:Class="LanguageChangeDemo.App"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="clr-namespace:LanguageChangeDemo"StartupUri="MainWindow.xaml"><Application.Resources><ResourceDictionary><ResourceDictionary.MergedDictionaries><ResourceDictionary Source="zh-CN.xaml" /></ResourceDictionary.MergedDictionaries></ResourceDictionary></Application.Resources>
</Application>

3、在MainWindow.xaml中添加中英文单选按钮和切换按钮，以及测试文本；并使用{DynamicResource x:Key}动态引用资源字典

<Window x:Class="LanguageChangeDemo.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:LanguageChangeDemo"mc:Ignorable="d"Title="{DynamicResource International}" Height="250" Width="395" WindowStartupLocation="CenterScreen"><Grid><Label Content="{DynamicResource labelLanguage}"  HorizontalAlignment="Left" Margin="34,54,0,0" VerticalAlignment="Top" HorizontalContentAlignment="Center" VerticalContentAlignment="Center"/><RadioButton x:Name="cn" Content="{DynamicResource comboChinese}" GroupName="LanguangeChoice" HorizontalAlignment="Left" Margin="106,60,0,0" VerticalAlignment="Top" HorizontalContentAlignment="Left" VerticalContentAlignment="Center" Checked="RadioButton_Checked" IsChecked="True"/><RadioButton x:Name="en" Content="{DynamicResource comboEnglish}" GroupName="LanguangeChoice" HorizontalAlignment="Left" Margin="198,60,0,0" VerticalAlignment="Top" HorizontalContentAlignment="Left" VerticalContentAlignment="Center" Checked="RadioButton_Checked"/><Button Visibility="Hidden" Content="{DynamicResource BtnContent}" HorizontalAlignment="Left" Margin="274,54,0,0" VerticalAlignment="Top" Height="25" Width="60" Click="Button_Click"/><TextBox Text="{DynamicResource textboxContent}" HorizontalAlignment="Center" Margin="0,132,0,0" TextWrapping="Wrap" VerticalAlignment="Top" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Width="395" BorderThickness="0"/></Grid>
</Window>

4、MainWindow.xaml.cs中添加切换逻辑

namespace LanguageChangeDemo
{/// <summary>/// Interaction logic for MainWindow.xaml/// </summary>public partial class MainWindow : Window{string selectItem = "";string languageType = "";public MainWindow(){InitializeComponent();}private void RadioButton_Checked(object sender, RoutedEventArgs e){RadioButton radioButton = sender as RadioButton;if (radioButton.IsChecked == true){selectItem = radioButton.Content.ToString();switch (selectItem){case "中文":languageType = "zh-CN";Change();break;case "英语":languageType = "en-US";Change();break;case "Chinese":languageType = "zh-CN";Change();break;case "English":languageType = "en-US";Change();break;default:break;}}}private void Button_Click(object sender, RoutedEventArgs e){改版前//if (languageType != null)//{//    ResourceDictionary langRd = null;//    try//    {//        //根据名字载入语言文件//        langRd = Application.LoadComponent(new Uri(languageType + ".xaml", UriKind.Relative)) as ResourceDictionary;//    }//    catch (Exception e2)//    {//        MessageBox.Show(e2.Message);//    }//    if (langRd != null)//    {//        //如果已使用其他语言,先清空//        if (this.Resources.MergedDictionaries.Count > 0)//        {//            this.Resources.MergedDictionaries.Clear();//        }//        this.Resources.MergedDictionaries.Add(langRd);//    }//}}public void Change(){if (languageType != null){ResourceDictionary langRd = null;try{//根据名字载入语言文件langRd = Application.LoadComponent(new Uri(languageType + ".xaml", UriKind.Relative)) as ResourceDictionary;}catch (Exception e2){MessageBox.Show(e2.Message);}if (langRd != null){//如果已使用其他语言,先清空if (this.Resources.MergedDictionaries.Count > 0){this.Resources.MergedDictionaries.Clear();}this.Resources.MergedDictionaries.Add(langRd);}}}}
}

5、效果