Jack posted on Wednesday, July 29, 2009
I ran into a bit of a surprise when I modified the text formatting of a certain SmartDate and it didn't work after databinding. I had previously created a simple IValueConverter so that I could databind my SmartDate properties.
My mistake/oversight was that I was simply returning a new SmartDate( ) from the ConvertBack which was binded to a DatePicker control. What happened of course is that the new SmartDate didn't have the updated text formatting. While it wasn't a big deal to 'reset' the textFormat in the set accessor it would be a pain if I did that a lot.
Does anybody have a better implementation? I don't know exactly about the internals of the IValueConverter but I didn't think that copying the FormatText to a local variable would work as I assume there is only one converter created per control.
Any ideas? I know there is the option of databinding to the SmartDate.Text as well but if the 3rd party control take date then that makes more sense althought I suppose I could create a converter for that as well.
public class SmartDateToDateConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value == null || ((SmartDate)value).IsEmpty) return null;
return ((SmartDate)value).Date;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
//if (value == null) return new SmartDate(SmartDate.EmptyValue);
return new SmartDate((DateTime?)value);
}
}
