如何本地化DatePicker？ [英] How to localize a DatePicker?

问题描述

在一个小的Wpf应用程序中，使用DatePicker绑定到DateTime属性。
当用户的区域和语言设置，数字和日期格式为德语时，日期显示为德语，日历显示德语月份名称。
现在我想用美式英语在MainWindow的c'tor中，我在InitializeComponent（）之前添加了（在InitializeComponent（））之后的情况下相同的情况）：

In a small Wpf application, use a DatePicker bound to a DateTime property. When the user's region and language settings, and number and date format are German, the date is displayed in German, and the calendar shows German month names. Now I wanted to get it in US-English. In the c'tor of MainWindow I added before InitializeComponent() (same situation when doing that after InitializeComponent()):

string uiLanguage = ConfigurationManager.AppSettings["UILanguage"]; //"en-US"
Thread.CurrentThread.CurrentUICulture = CultureInfo.GetCultureInfo(uiLanguage);
FrameworkElement.LanguageProperty.OverrideMetadata(typeof(FrameworkElement), new FrameworkPropertyMetadata(XmlLanguage.GetLanguage(uiLanguage)));

虽然这与文本框一起使用，但它对DatePicker没有影响。
然后我是骗子，并创建了一个新用户约翰英语，以约翰英语的身份登录，将他的显示语言设置为英文，日期和数字格式为美英。现在，DatePicker始终以美英格式显示日期，日历显示英文月份名称，即使我将程序的语言设置为德语。
怎么可以解决？可以解决吗？

While that works with textboxes, it has no effect with the DatePicker. Then I was cheaky and created a new user "John English", logged in as "John English", set his display language to English and the date and number format to US-English. Now the DatePicker always displays the date in the US-English format and the calendar shows English month names, even when I set the language of my program to German. How can that be resolved? Can it be resolved at all?

推荐答案

在App.xaml的代码中添加以下代码：

In the codebehind of the App.xaml add the following code:

public App()
{
    EventManager.RegisterClassHandler(typeof(DatePicker), DatePicker.LoadedEvent, new RoutedEventHandler(DatePicker_Loaded));
}

void DatePicker_Loaded(object sender, RoutedEventArgs e)
{
    var dp = sender as DatePicker;
    if (dp == null) return;

    var tb = GetChildOfType<DatePickerTextBox>(dp);
    if (tb == null) return;

    var wm = tb.Template.FindName("PART_Watermark", tb) as ContentControl;
    if (wm == null) return;

    wm.Content = "[Put your text here]";
}

[Ontopic;]]
尝试设置CurrentCulture和CurrentUICulture。

[Ontopic ;)] Try setting both CurrentCulture and CurrentUICulture.

//Set default culture to Nl
System.Threading.Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-US");
System.Threading.Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");

ref for GetChildOfType

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