WPF 實現語言在線切換

WPF應用怎么實現在線切換語言功能，方法可以有好多種：

一、開發兩套界面，在點擊切換語言時調用相應的界面，最low

二、通過讀取事先做好的語言對照表，可以使excel文件、xml文件等，加載之后保存在全局字典或者datatable中都行，從而進行語言切換

三、利用WPF中的動態加載資源字典進行切換。

下面就第三種方法進行闡述：

第一步：使用資源字典，首先新建兩個字典文件en-us.xaml、zh-cn.xaml。定義中英文的字符串在這里面【注意：添加xmlns:s="clr-namespace:System;assembly=mscorlib】

zh-cn.xam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="biFile">文件</sys:String>
    <sys:String x:Key="biHelp">幫助</sys:String>
    <sys:String x:Key="biAbout">關於</sys:String>
    <sys:String x:Key="biName">產品名稱：</sys:String>
    <sys:String x:Key="biCopyRight">版權所有:</sys:String>
    <sys:String x:Key="biWeb">公司網址:</sys:String>
    <sys:String x:Key="biVersion">版本號:</sys:String>
    <sys:String x:Key="biSelectDevice">選擇設備</sys:String>
    <sys:String x:Key="biClose">關閉</sys:String>
    <sys:String x:Key="biSetting">設置</sys:String>
    <sys:String x:Key="biLanguage">語言</sys:String>
</ResourceDictionary>

en-us.xaml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="biFile">File</sys:String>
    <sys:String x:Key="biHelp">Help</sys:String>
    <sys:String x:Key="biAbout">About</sys:String>
    <sys:String x:Key="biName">Product Name：</sys:String>
    <sys:String x:Key="biCopyRight">CopyRight:</sys:String>
    <sys:String x:Key="biWeb">Web:</sys:String>
    <sys:String x:Key="biVersion">Version:</sys:String>
    <sys:String x:Key="biSelectDevice">Choose Device</sys:String>
    <sys:String x:Key="biClose">Close</sys:String>
    <sys:String x:Key="biSetting">Setting</sys:String>
    <sys:String x:Key="biLanguage">Language</sys:String>
</ResourceDictionary>

第二步：講兩個資源字典添加到App.xaml中，這里注意下，因為兩個字典中有同樣字符，如果沒有動態更改，默認后添加的生效

App.xaml如下：

<Application x:Class="CANTest.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
             xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
             StartupUri="MainWindow.xaml" Startup="OnAppStartup_UpdateThemeName" Exit="Application_Exit">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>                
                <ResourceDictionary Source="Language\StringResource.zh-CN.xaml" />
                <ResourceDictionary Source="Language\StringResource.en-US.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

第三步：在Properties.Settings中添加應用程序設置，保存上次關閉程序的語言環境

第四步：在App.Xaml.cs中添加必要的更新語言函數，動態切換，重新加載資源文件

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Windows;
using DevExpress.Xpf.Core;
using System.Threading;
using System.Globalization;

namespace WPFApplication
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        private void OnAppStartup_UpdateThemeName(object sender, StartupEventArgs e)
        {
            DevExpress.Xpf.Core.ApplicationThemeHelper.UpdateApplicationThemeName();
        }
        public static string Language { get; set; }

        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);

            GetLanguage();
        }
        private void Application_Exit(object sender, ExitEventArgs e)
        {           
            SaveLanguage();
            //關閉所有線程，即關閉此進程
            System.Environment.Exit(0);

            //MessageBoxManager.Unregister();
        }

        #region Method
        /// <summary>
        /// 開機啟動默認的語言
        /// </summary>
        private void GetLanguage()
        {
            Language = string.Empty;
            try
            {
                Language = CANTest.Properties.Settings.Default.Language.Trim();
            }
            catch (Exception)
            {
            }
            Language = string.IsNullOrEmpty(Language) ? "en-US" : Language;

            //update Language
            UpdateLanguage();
        }
        /// <summary>
        /// 保存語言設置
        /// </summary>
        private void SaveLanguage()
        {
            try
            {
                CANTest.Properties.Settings.Default.Language = Language;
                CANTest.Properties.Settings.Default.Save();
            }
            catch (Exception)
            {
            }
        }
        /// <summary>
        /// 更換語言包
        /// </summary>
        public static void UpdateLanguage()
        {
            List<ResourceDictionary> dictionaryList = new List<ResourceDictionary>();
            foreach (ResourceDictionary dictionary in Application.Current.Resources.MergedDictionaries)
            {
                dictionaryList.Add(dictionary);
            }
            string requestedLanguage = string.Format(@"Language\StringResource.{0}.xaml", Language);
            ResourceDictionary resourceDictionary = dictionaryList.FirstOrDefault(d => d.Source.OriginalString.Equals(requestedLanguage));
            if (resourceDictionary == null)
            {
                requestedLanguage = @"Language\StringResource.en-US.xaml";
                resourceDictionary = dictionaryList.FirstOrDefault(d => d.Source.OriginalString.Equals(requestedLanguage));
            }
            if (resourceDictionary != null)
            {
                Application.Current.Resources.MergedDictionaries.Remove(resourceDictionary);
                Application.Current.Resources.MergedDictionaries.Add(resourceDictionary);
            }
        }
        #endregion
    }
}

第五步：在界面設計器中需要顯示的位置添加動態資源

例如：

 <Button x:Name="buttonNewTaskWindow" Content="{DynamicResource File}"/>

<Button x:Name="buttonProperty" Content="{DynamicResource Help}"/>

 

第六步：增加選擇語言命令

/// <summary>
        /// 語言選擇命令
        /// </summary>
        private static RoutedUICommand chooseLanguage = new RoutedUICommand("ChooseLanguage", "ChooseLanguage", typeof(Commands));
        public static RoutedUICommand ChooseLanguage
        {
            get { return chooseLanguage; }
        }


#region 中英文切換
        private void ChooseLanguage_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            e.CanExecute = true;
            e.Handled = true;
        }

        private void ChooseLanguage_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            //英文
            if (e.Parameter.ToString() == "en")
            {
                App.Language = "en-US";
            }
            //中文
            else if (e.Parameter.ToString() == "zh")
            {
                App.Language = "zh-CN";
            }
            App.UpdateLanguage();
        }

        #endregion