應用程式如何得知 "控制台" --> "地區語言選項" 的改變

系統事件的使用者喜好設定變更時可以藉由 命名空間Microsoft.Win32 的 SystemEvents.UserPreferenceChanged 事件進行通知,

以下程式是註冊該事件

Visual Basic
AddHandler SystemEvents.UserPreferenceChanged, AddressOf SystemEvents_UserPreferenceChanged        DisplayCultureInfo()

C#
SystemEvents.UserPreferenceChanged += new UserPreferenceChangedEventHandler(SystemEvents_UserPreferenceChanged); 

它的事件參數 UserPreferenceChangedEventArgs 的 Category 屬性會傳入變更的事件類別, 如果是 "地區語言選項" 的改變, 是 UserPreferenceCategory.Locale

事件程序如下:

Visual Basic
    Sub SystemEvents_UserPreferenceChanged(ByVal sender As Object, ByVal e As Microsoft.Win32.UserPreferenceChangedEventArgs)

        If e.Category = UserPreferenceCategory.Locale Then

            DisplayCultureInfo()

        End If

    End Sub

C#
static void SystemEvents_UserPreferenceChanged(object sender, UserPreferenceChangedEventArgs e)  
{   
   if (e.Category== UserPreferenceCategory.Locale )   
        DisplayCultureInfo();   
}

Thread.CurrentThread.CurrentCulture 會回傳目前執行緒的文化特性, 只有應用程式載入初期會寫入這個值, 所以控制台改變, 這個值並不會跟著異動, 若要取得控制台最新的文化特性, 必須先將目前的快取資料清除, 呼叫ClearCachedData 方法. 當快取被清除時, 將會自動取得控制台最新的設定.

Visual Basic

    Sub DisplayCultureInfo()

        Thread.CurrentThread.CurrentCulture.ClearCachedData()

        Dim UsersCulture As CultureInfo = Thread.CurrentThread.CurrentCulture

        Dim region As New RegionInfo(UsersCulture.Name)

        Console.WriteLine(region.DisplayName)

        Console.WriteLine(region.EnglishName)

        Console.WriteLine(region.NativeName)

        Console.WriteLine(region.CurrencyEnglishName)

        Console.WriteLine(region.CurrencyNativeName)

    End Sub

C#

private static void DisplayCultureInfo()  
{   
    Thread.CurrentThread.CurrentCulture.ClearCachedData();   
    CultureInfo UsersCulture = Thread.CurrentThread.CurrentCulture;   
    RegionInfo region = new RegionInfo(UsersCulture.Name);   
    Console.WriteLine(region.DisplayName);   
    Console.WriteLine(region.EnglishName);   
    Console.WriteLine(region.NativeName);   
    Console.WriteLine(region.CurrencyEnglishName);   
    Console.WriteLine(region.CurrencyNativeName);           
}