Use "real" CultureInfo.CurrentCulture in WPF Binding, not CultureInfo from IetfLanguageTag

Question

In my case:

I have a TextBlock Binding to a property of type DateTime. I want it to be displayed as the Regional settings of the User says.

<TextBlock Text="{Binding Date, StringFormat={}{0:d}}" />

I am setting Language property as WPF XAML Bindings and CurrentCulture Display says:

this.Language = XmlLanguage.GetLanguage(CultureInfo.CurrentCulture.IetfLanguageTag);

But with this line of code it just displays the text as the default format of CultureInfo with IetfLanguageTag of CurrentCulture says, not as the effective value selected in systems region settings says:

(e.g. for "de-DE" dd.MM.yyyy is used instead of selected yyyy-MM-dd)

Is there a way Binding uses the correct format without defining ConverterCulture on every single Binding?

In code

string.Format("{0:d}",Date);

uses the right Culture settings.

edit:

another way which doesn't work as desired (like this.Language = ... does):

xmlns:glob="clr-namespace:System.Globalization;assembly=mscorlib"

and

<Binding Source="{x:Static glob:CultureInfo.CurrentCulture}" 
 Path="IetfLanguageTag" 
 ConverterCulture="{x:Static glob:CultureInfo.InvariantCulture}" />

Answer 1

You can create a subclass of binding (e.g. CultureAwareBinding) which sets the ConverterCulture automatically to the current culture when created.

It's not a perfect solution, but it's probably the only one, since retroactively forcing Binding to respect the culture could break other code in WPF which depends on this behavior.

Let me know if you need more help!