WPF，改變當前文化的NumberFormatInfo不起作用

Question

在App.xaml.cs我：

Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US"); 
Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-US"); 

FrameworkElement.LanguageProperty.OverrideMetadata(typeof(FrameworkElement), 
    new FrameworkPropertyMetadata(XmlLanguage.GetLanguage(
     CultureInfo.CurrentCulture.IetfLanguageTag))); 

在我MainWindow.xaml.cs我：

NumberFormatInfo nfi = System.Threading.Thread.CurrentThread 
         .CurrentCulture.NumberFormat; 
nfi.CurrencySymbol = "USD"; 
nfi.CurrencyDecimalSeparator = "."; 
nfi.CurrencyDecimalDigits = 0; 

NumberFormatInfo nfi = System.Threading.Thread.CurrentThread 
         .CurrentUICulture.NumberFormat; 
nfi.CurrencySymbol = "USD"; 
nfi.CurrencyDecimalSeparator = "."; 
nfi.CurrencyDecimalDigits = 0; 

現在在不同的窗口，這將在主窗口中打開，我寫了下面：

<TextBox Text="{Binding Total, StringFormat=c}" 

但結果是一樣的東西$ 1,200.00，不是我預計：1,200美元。這裏有什麼問題？

Answer 1

可能有更聰明的方法，但這應該工作始終...

// xmlns:sysglb="clr-namespace:System.Globalization;assembly=mscorlib" 
<TextBox Text="{Binding Total, StringFormat='{}{0:C}', ConverterCulture={x:Static sysglb:CultureInfo.CurrentUICulture}}" /> 

而且在應用程序啓動或構造函數移動這個...

然後做OverrideMetadata和base.OnStartup前 - 如。 。

protected override void OnStartup(StartupEventArgs e) 
{ 
    Thread.CurrentThread.CurrentCulture = new CultureInfo("en-GB"); 
    Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-GB"); 

    NumberFormatInfo nfi = System.Threading.Thread.CurrentThread 
          .CurrentCulture.NumberFormat; 
    nfi.CurrencySymbol = "USD"; 
    nfi.CurrencyDecimalSeparator = "."; 
    nfi.CurrencyDecimalDigits = 0; 

    nfi = System.Threading.Thread.CurrentThread 
          .CurrentUICulture.NumberFormat; 
    nfi.CurrencySymbol = "USD"; 
    nfi.CurrencyDecimalSeparator = "."; 
    nfi.CurrencyDecimalDigits = 0; 

    FrameworkElement.LanguageProperty.OverrideMetadata(typeof(FrameworkElement), 
     new FrameworkPropertyMetadata(XmlLanguage.GetLanguage(
      CultureInfo.CurrentCulture.IetfLanguageTag))); 

    base.OnStartup(e); 

} 

參見：

WPF StringFormat={0:C} showing as dollars

Answer 2

NumberFormatting是一個使用CurrentCulture的操作（默認情況下，除非您明確地向該方法提供Culture或NumberFormatter）而不是CurrentUICulture。 CurrentUICulture用於資源（本地化）查找。

您從CurrentCulture獲取的NumberFormatInfo應該只讀爲(see Remarks of NumberFormatInfo documentation)，並且在嘗試設置任何屬性(see Remarks of NumberFormatinfo.IsReadOnly)時應該拋出InvalidOperationException。 （您是否吞下此異常？）如果您創建可寫的CultureInfo並更改其屬性，則可以將其設置爲您當前的文化。

你需要做的是這樣的：

CultureInfo ci = CultureInfo.CreateSpecificCulture("en-US"); 
NumberFormatInfo nfi= ci.NumberFormat; 
nfi.CurrencySymbol = "USD"; 
nfi.CurrencyDecimalSeparator = "."; 
nfi.CurrencyDecimalDigits = 0; 
// set the default culture for all threads that haven't been explicitly set (.Net 4.5) 
CultureInfo.DefaultThreadCurrentCulture = ci; 
// or the following if you aren't using .Net 4.5 
// Thread.CurrentThread.CurrentCulture = ci;