c# – WPF DatePicker Watermark使用错误的语言,但Dateformat是

public partial class App : Application
{
    public App()
    {
        CultureInfo ci = new CultureInfo("de-DE"); 
        Thread.CurrentThread.CurrentCulture = ci;
        Thread.CurrentThread.CurrentUICulture = ci;
    }
}

public partial class WindowMain : RibbonWindow
{
    public WindowMain()
    {
        this.Language = XmlLanguage.GetLanguage("de-DE");
        this.InitializeComponent();
    }
}

有一点我可以说,DatePicker中的Watermark实现了bug,没有简单的访问权限.也许,由于这种困难,文本的本地化不起作用. @Matt Hamilton有一篇很棒的文章,引自 here：

Something that a lot of people (myself included) don’t like about the DatePicker,though,is that by default if no date is displayed it shows the text “Select a date” as a watermark,and this text is baked into the control – it’s not localized or accessible by any public property. This is particularly frustrating if the date in question is optional and you don’t necessarily want to prompt your users to select one.

在同一篇文章中,他提供了如何访问Watermark的决定.这里：

How to localize the WPF 4.0 DatePicker control

@Wayne Maurer以附加依赖属性的形式创建了一个通用解决方案：

<DatePicker Grid.Row="2" 
            local:DatePickerWatermarkBehaviour.Watermark="Select the date" />

您需要基于当前的文化,设置水印的文本,例如使用上面的例子.

注意：在DatePicker的Silverlight to Watermark中进行访问[link]：

DatePickerTextBox box = base.GetTemplateChild("TextBox") as DatePickerTextBox;
box.Watermark = "Type or select a date --> ";