WPF界面多语言切换

 <ResourceDictionary>
     <ResourceDictionary.MergedDictionaries>
         <ResourceDictionary Source="en-us.xaml" />
         <ResourceDictionary Source="zh-cn.xaml" />
     </ResourceDictionary.MergedDictionaries>
 </ResourceDictionary>

 public static void UpdateLanguage(string lan)
 {
     // 获取配置
     string requestedLanguage = $"{lan}.xaml";
     ResourceDictionary resourceDictionary = Application.Current.Resources.MergedDictionaries.FirstOrDefault(d => d.Source.OriginalString.Equals(requestedLanguage));
     Current.Resources.MergedDictionaries.Remove(resourceDictionary);
     Current.Resources.MergedDictionaries.Add(resourceDictionary);
 
     // 保存配置
     Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
     ConfigurationManager.AppSettings["Language"] = lan;
     config.Save(ConfigurationSaveMode.Modified);
     //刷新
     ConfigurationManager.RefreshSection("appSettings");
 }

<StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
    <!--<TextBlock Text="用户名："  Margin="0,5,0,0"/>-->
    <TextBlock Text="{DynamicResource Username}"  Margin="0,5,0,0"/>
    <TextBox x:Name="txtUsername" Width="200" Height="30" Margin="0,0,15,0"/>
</StackPanel>
 
 
<StackPanel Grid.Row="2" Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
    <TextBlock Text="{DynamicResource Password}"  Margin="0,5,0,0"/>
    <PasswordBox x:Name="txtPassword" Width="200" Height="30" Margin="0,0,15,0"/>
    
</StackPanel>
<StackPanel Grid.Row="3" HorizontalAlignment="Center" VerticalAlignment="Center">
    <Button Content="{DynamicResource Login}"  Background="#0047AB" Foreground="White"  HorizontalAlignment="Right"  Click="LoginButton_Click" Width="200" Height="30" Margin="30,0,0,0"/>
</StackPanel>

 private void LanguageSwitching(object sender, RoutedEventArgs e)
 {
     App.UpdateLanguage("en-us");
 }

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:s="clr-namespace:System;assembly=mscorlib">
    <s:String x:Key="OK">Sure</s:String>
    <s:String x:Key="Cancle">NoSure</s:String>
    <s:String x:Key="Username">UserName：</s:String>
    <s:String x:Key="Password">PassWord：</s:String>
    <s:String x:Key="Login">Login</s:String>
    <s:String x:Key="LanS">简体中文</s:String>
</ResourceDictionary>

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           
                    xmlns:s="clr-namespace:System;assembly=mscorlib">
    <s:String x:Key="OK">确认</s:String>
    <s:String x:Key="Cancle">取消</s:String>
    <s:String x:Key="Username">用户名：</s:String>
    <s:String x:Key="Password">密码：</s:String>
    <s:String x:Key="Login">登录</s:String>
    <s:String x:Key="LanS">English</s:String>
</ResourceDictionary>