如何本地化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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