uwp CalendarDatePicker set date format

问题:

I'm trying to set a date format for the CalendarDatePicker for globalisation purposes. I tried this:

endDate = (FindName("cdpEnd") as CalendarDatePicker);
endDate.DateFormat = CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern;
endDate.Date = workObject.EndCal;

But it gave me the following exception:

System.ArgumentException: The parameter is incorrect.

formatTemplate
   at Windows.UI.Xaml.Controls.CalendarDatePicker.put_DateFormat(String value)
   at App1.PageWorkObject.rootGrid_Loaded(Object sender, RoutedEventArgs e)

I checked the value I had set and it looked normal to me: "M/d/yyyy"

What am I doing wrong?

回答1:

When you use a CalendarDatePicker, the string content of the TextBox portion of it is created by a DateTimeFormatter.

"M/d/yyyy" seems to be normal, but

Important You can't arbitrarily combine components and necessarily obtain a valid template. The only valid templates are those defined by the provided grammar.

If you read refer to the DateTimeFormatter class, you will find there is no format like "M/d/yyyy", for the same format like "M/d/yyyy", I think it should be like this:

endDate.DateFormat = "{month.integer}‎/‎{day.integer}‎/‎{year.full}";