WPF实现无刷新动态切换多语言(国际化)

1. 在WPF中国际化使用的是 .xaml文件的格式

如图：Resource Dictionary (WPF)

2. 创建默认的语言文件和其他语言文件

这里以英语为默认语言，新建一个 Resource Dictionary (WPF)文件，并命名为DefaultLanguage.xaml,内容如下：

<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"><!--这行新增加的-->
    <sys:String x:Key="OK">
        OK
    </sys:String>
    <sys:String x:Key="Cancel">
        Cancel
    </sys:String>
</ResourceDictionary>

　　 默认语言文件的 BuildAction要设置为 Page，如图：

为了便于管理，一般将所有的语言文件都放在一个目录下，这里创建lang目录，

然后在创建另一个语言文件，这里是中文，命名为 zh_CN.xaml，内容如下：

<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="OK">
        确定
    </sys:String>

    <sys:String x:Key="Cancel">
        取消
    </sys:String>
</ResourceDictionary>

其他非默认语言的设置应该如下：

BuildAction设置为：Content ；CopyToOutputDirectory设置为：Copy if newer (先这样做吧，原因未清)

3.在App.xaml中配置默认语言：

<Application x:Class="LanTest.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary><!--这个节点就是配置默认语言的-->
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="lang\DefaultLanguage.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

4.实际使用(敲代码了)　

4.1. 界面效果如下：

4.2. 界面的.xaml代码

 <Window x:Class="LanTest.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         Title="MainWindow" Height="" Width="">
     <Grid>
         <!--这里的{DynamicResource OK}就是动态调用 资源中的key为OK的内容-->
         <Button Content="{DynamicResource OK}" HorizontalAlignment="Left" Margin="134,161,0,0" VerticalAlignment="Top" Width="" Height=""/>
         <Button Content="{DynamicResource Cancel}" HorizontalAlignment="Left" Margin="278,161,0,0" VerticalAlignment="Top" Width="" Height=""/>
         <Button Content="Button" HorizontalAlignment="Left" Margin="287,59,0,0" VerticalAlignment="Top" Width="" Click="Button_Click" Loaded="Button_Loaded"/>
         <ComboBox Name="cbLang" HorizontalAlignment="Left" Margin="118,59,0,0" VerticalAlignment="Top" Width="">
         </ComboBox>

     </Grid>
 </Window>

4.3. 后台逻辑代码：

 using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
 using System.Windows.Documents;
 using System.Windows.Input;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;

 namespace LanTest
 {
     /// <summary>
     /// Interaction logic for MainWindow.xaml
     /// </summary>
     public partial class MainWindow : Window
     {
         public MainWindow()
         {
             InitializeComponent();
         }

         //定义ComboBox选项的类，存放Name和Value
         public class CategoryInfo
         {
             public string Name
             {
                 get;
                 set;
             }
             public string Value
             {
                 get;
                 set;
             }

         }

         //切换语言
         private void btnChangeLang_Click(object sender, RoutedEventArgs e)
         {
             object selectedName = cbLang.SelectedValue;
             if (selectedName != null)
             {
                 string langName = selectedName.ToString();
                 //英语的语言文件名为:DefaultLanguage,所有这里要转换一下
                 if (langName == "en_US")
                     langName = "DefaultLanguage";
                 //根据本地语言来进行本地化,不过这里上不到
                 //CultureInfo currentCultureInfo = CultureInfo.CurrentCulture;

                 ResourceDictionary langRd = null;
                 try
                 {
                     //根据名字载入语言文件
                     langRd = Application.LoadComponent(new Uri(@"lang\" + langName + ".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 > )
                     {
                         this.Resources.MergedDictionaries.Clear();
                     }
                     this.Resources.MergedDictionaries.Add(langRd);
                 }
             }
             else
                 MessageBox.Show("Please selected one Language first.");
         }

         //控件载入时，为ComboBox赋值
         private void cbLang_Loaded(object sender, RoutedEventArgs e)
         {
             List<CategoryInfo> categoryList = new List<CategoryInfo>();
             categoryList.Add(new CategoryInfo() { Name = "English", Value = "en_US" });
             categoryList.Add(new CategoryInfo() { Name = "中文", Value = "zh_CN" });

             cbLang.ItemsSource = categoryList;//绑定数据，真正的赋值
             cbLang.DisplayMemberPath = "Name";//指定显示的内容
             cbLang.SelectedValuePath = "Value";//指定选中后的能够获取到的内容
         }
     }
 }