Issue with XAML Slider control - xaml

Question

I have the value of a slider control bound to a textblock. For some reason it works erratically. For example if I move the thumb slowly I get the right increments, but when I move it fast, It just shows some random stuff.
And here is my value changed event in C#:
private void sliderShiftStart_ValueChanged(object sender, RangeBaseValueChangedEventArgs e)
{
if (sliderShiftStart.Value > counter)
{
time = time.AddMinutes(30);
tbTimeDispPopup.Text = string.Format("{0:t}", time);
}
else
{
time = time.AddMinutes(-30);
tbTimeDispPopup.Text = string.Format("{0:t}", time);
}
counter = Convert.ToInt32(sliderShiftStart.Value);
}
counter is a double type variable,
time is a DateTime variable,
and tbTimeDispPopup is a textblock.
The tracking works fine when I don't do time calculations. I am trying to make time as slider values means the slider minimum is going to be 12:00 AM and the slider maximum is going to be 12:00 AM the next day.
Here is the link to my project, if somebody could have a look at it.
Project Link
Please advise.
Thanks all.

Answer 1

i've looked on your project, and if i correctly understand, you want to bind textbox text be bound to slider value. To do this i would suggest you the following : bind textbox text to slider value, set min max as you need, and use converter to properly display the DateTime as below.
<Grid Background="DarkSlateGray">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock x:Name="TbTimeDispPopup"
Grid.Row="0"
HorizontalAlignment="Stretch"
VerticalAlignment="Center"
FontSize="30"
Text="{Binding ElementName=SliderShiftStart, Path=Value, Converter={StaticResource ValueToHoursConverter}}"
TextWrapping="Wrap" />
<Slider x:Name="SliderShiftStart"
Grid.Row="1"
MinHeight="0"
HorizontalAlignment="Stretch"
VerticalAlignment="Center"
IsSnapToTickEnabled="True"
Maximum="48"
TickFrequency="1"/>
</Grid>
and here is the converter:
public class ValueToHoursConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
object result = DependencyProperty.UnsetValue;
if (value is double)
{
result = DateTime.Now.Date.AddHours((double)value/2d);
}
return result;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
Hope this helps.