<?xml version="1.0" encoding="utf-8" ?><configuration>  <appSettings>    <add key="Languages" value="en-US.xaml"/>  </appSettings></configuration>

protected override void OnStartup(StartupEventArgs e)        {            base.OnStartup(e);            //第一种方式就是用配置文件 配置            string appLang = ConfigurationManager.AppSettings.Get("Languages");            App.Current.Resources.MergedDictionaries.Add(new ResourceDictionary() { Source = new Uri(appLang, UriKind.RelativeOrAbsolute) });            //第二种方式 就是获取当前系统的语言            string lang = System.Globalization.CultureInfo.InstalledUICulture.Name.ToString(CultureInfo.InvariantCulture);            switch (lang)            {                case "zh-CN":                    App.Current.Resources.MergedDictionaries.Add(new ResourceDictionary() { Source = new Uri("zh-CN.xaml", UriKind.RelativeOrAbsolute) });                    break;                case "en-US":                    App.Current.Resources.MergedDictionaries.Add(new ResourceDictionary() { Source = new Uri("en-US.xaml", UriKind.RelativeOrAbsolute) });                    break;                default:                    App.Current.Resources.MergedDictionaries.Add(new ResourceDictionary() { Source = new Uri("en-US.xaml", UriKind.RelativeOrAbsolute) });                    break;            }        }

<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="Window1Title">Window</sys:String>  <sys:String x:Key="UserLog">UserLogin</sys:String>  <sys:String x:Key="UserCode">UserCode</sys:String>  <sys:String x:Key="UserName">UserPwd</sys:String>  <sys:String x:Key="BtnLoginOk">Login</sys:String>  <sys:String x:Key="BtnLoginCancel">Cancel</sys:String>  <sys:String x:Key="BtnzhCN">Chinese</sys:String>  <sys:String x:Key="BtnenUS">English</sys:String></ResourceDictionary>

<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="Window1Title">窗体</sys:String>  <sys:String x:Key="UserLog">用户登录</sys:String>  <sys:String x:Key="UserCode">用户名</sys:String>  <sys:String x:Key="UserName">密码</sys:String>  <sys:String x:Key="BtnLoginOk">登录</sys:String>  <sys:String x:Key="BtnLoginCancel">取消</sys:String>  <sys:String x:Key="BtnzhCN">中文</sys:String>  <sys:String x:Key="BtnenUS">英文</sys:String></ResourceDictionary>

<Window x:Class="I18N.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        Title="{DynamicResource Window1Title}">  <Grid HorizontalAlignment="Center" VerticalAlignment="Center">    <GroupBox Header="{DynamicResource UserLog}">      <Grid>        <Grid.RowDefinitions>          <RowDefinition Height="45*" />          <RowDefinition Height="48*" />          <RowDefinition Height="58*" />          <RowDefinition Height="100*" />        </Grid.RowDefinitions>        <TextBlock Grid.Row="1"                   Margin="36,22,0,0"                   HorizontalAlignment="Left"                   VerticalAlignment="Top"                   Text="{DynamicResource UserCode}"                   TextWrapping="Wrap" />        <TextBlock Grid.Row="2"                   Margin="36,23,0,0"                   HorizontalAlignment="Left"                   VerticalAlignment="Top"                   Text="{DynamicResource UserName}"                   TextWrapping="Wrap" />        <TextBox Grid.Row="1"                 Width="120"                 Height="23"                 Margin="125,22,0,0"                 HorizontalAlignment="Left"                 VerticalAlignment="Top"                 Text="TextBox"                 TextWrapping="Wrap" />        <TextBox Grid.Row="2"                 Width="120"                 Height="23"                 Margin="125,23,0,0"                 HorizontalAlignment="Left"                 VerticalAlignment="Top"                 Text="TextBox"                 TextWrapping="Wrap" />        <Button Grid.Row="3"                Width="75"                Margin="78,29,0,0"                HorizontalAlignment="Left"                VerticalAlignment="Top"                Content="{DynamicResource BtnLoginOk}" />        <Button Grid.Row="3"                Width="75"                Margin="192,29,0,0"                HorizontalAlignment="Left"                VerticalAlignment="Top"                Content="{DynamicResource BtnLoginCancel}" />        <Button Name="btnenUS"                Width="75"                Margin="301,10,0,0"                HorizontalAlignment="Left"                VerticalAlignment="Top"                Click="btnenUS_Click"                Content="{DynamicResource BtnenUS}" />        <Button Name="btnzhCN"                Width="75"                Margin="221,10,0,0"                HorizontalAlignment="Left"                VerticalAlignment="Top"                Click="btnzhCN_Click"                Content="{DynamicResource BtnzhCN}" />      </Grid>    </GroupBox>  </Grid></Window>

using System;using System.Windows;namespace I18N{    /// <summary>    /// MainWindow.xaml 的交互逻辑    /// </summary>    public partial class MainWindow : Window    {        public MainWindow()        {            InitializeComponent();        }        private void btnzhCN_Click(object sender, RoutedEventArgs e)        {            App.Current.Resources.MergedDictionaries.Add(new ResourceDictionary() { Source = new Uri("zh-CN.xaml", UriKind.RelativeOrAbsolute) });        }        private void btnenUS_Click(object sender, RoutedEventArgs e)        {            App.Current.Resources.MergedDictionaries.Add(new ResourceDictionary() { Source = new Uri("en-US.xaml", UriKind.RelativeOrAbsolute) });        }    }}