DatePicker
最后更新于
这有帮助吗？
最后更新于
这有帮助吗？
The DatePicker control allows the user to pick a date value.
Use a DatePicker to let a user enter a date value. The user picks the date using selection for month, day, and year values. You can customize the DatePicker in various ways to suit your app.
By default, the date picker shows the day, month, and year. If your scenario for the date picker doesn't require all the fields, you can hide the ones you don't need. To hide a field, set its corresponding _field_Visible property to false. For more info, see the DayVisible, MonthVisible, and YearVisible properties.
The string content of each ComboBox in the DatePicker is created by a DateTimeFormatter. You can use a string that is either a format template or a format pattern to specify the format. For more info, see the DayFormat, MonthFormat, and YearFormat properties.
The date picker control has both Date / DateChanged and SelectedDate / SelectedDateChanged APIs. The difference between these is that Date is not nullable, while SelectedDate is nullable.
The value of SelectedDate is used to populate the date picker and is null by default. If SelectedDate is null, the Date property is set to 12/31/1600; otherwise, the Date value is synchronized with the SelectedDate value. When SelectedDate is null, the picker is 'unset' and shows the field names instead of a date.
To use the date value in your app, you typically use a data binding to the SelectedDate property, or handle the SelectedDateChanged event.
You can set the MinYear and MaxYear properties to restrict the date values in the picker. By default, MinYear is set to 100 years prior to the current date and MaxYear is set to 100 years past the current date.
If you set only MinYear or MaxYear, you need to ensure that a valid date range is created by the date you set and the default value of the other date; otherwise, no date will be available to select in the picker. For example, setting only yearDatePicker.MaxYear = new DateTimeOffset(new DateTime(900, 1, 1)); creates an invalid date range with the default value of MinYear.
Initializing a date value
This example demonstrates setting the
The date properties can't be set as a XAML attribute string, because the Windows Runtime XAML parser doesn't have a conversion logic for converting strings to dates as / objects.
