I know this is an old post, but I am doing an update anyway. I have this type of binding which have solved with a converter. I think it has been working earlier, but today I noticed that I got DateTime.Now as value in my RadMaskedDateTimeInput. The binding is working except for the initial value which is set to DateTime.Now in UI.This value is not propagated to the binding, but when I edit the UI I get the right value.
I set the Duration to 20 min by default but still I only get DateTime.Now. I have tried to bind to a DateTime? property without the converter but I still only get DateTime.Now in my UI.
Here is the
<telerik:RadMaskedDateTimeInput
x:Name="DurationInput"
EmptyContent="{dt:Text HHMM}"
InputBehavior="Replace"
Mask="HH:mm"
SelectionOnFocus="SelectAll"
TextMode="PlainText"
UpdateValueEvent="LostFocus"
Value="{Binding Duration, Mode=TwoWay, Converter={StaticResource TimeSpanDateTimeConverter}}"/>
And this is my converter:
using System;
using System.Globalization;
using System.Windows.Data;
public class TimeSpanDateTimeConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
// TimeSpan in
if (!(value is TimeSpan))
{
return default(DateTime?);
}
var timeSpan = (TimeSpan) value;
// DateTime out
if (targetType != typeof(DateTime?))
{
return null;
}
var nowDate = DateTime.Now.Date;
return nowDate + timeSpan;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
// DateTime in
var dateTime = (DateTime?) value;
// TimeSpan out
return targetType != typeof(TimeSpan?)
? null
: dateTime?.TimeOfDay;
}
}
And this is my view-model property:
public TimeSpan? Duration
{
get => _duration;
set
{
SetProperty(ref _duration, value);
}
}
I am using Telerik 2020.1.115.
Best regards
Ola