/// <summary>
/// Converts a value.
/// </summary>
/// <param name="value">The value that is produced by the binding target.</param>
/// <param name="targetType">The type to convert to.</param>
/// <param name="parameter">The converter parameter to use.</param>
/// <param name="culture">The culture to use in the converter.</param>
/// <returns>
/// A converted value. If the method returns <c>null</c>, the valid <c>null</c> value is used.
/// </returns>
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
var input = value as string;
if (input == null)
{
return(DependencyProperty.UnsetValue);
}
if (targetType != typeof(TimeSpan))
{
return(DependencyProperty.UnsetValue);
}
var formatString = parameter as string;
if (string.IsNullOrWhiteSpace(formatString))
{
return(TimeSpan.Parse(input));
}
var parser = new FormattedTimeSpanParser(formatString);
return(parser.Parse(input));
}
/// <summary>
/// Converts a value.
/// </summary>
/// <param name="value">
/// The value that is produced by the binding target.
/// </param>
/// <param name="targetType">
/// The type to convert to.
/// </param>
/// <param name="parameter">
/// The converter parameter to use.
/// </param>
/// <param name="culture">
/// The culture to use in the converter.
/// </param>
/// <returns>
/// A converted value. If the method returns null, the valid null value is used.
/// </returns>
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
var input = value as string;
if (input == null)
{
return Binding.DoNothing;
}
if (targetType != typeof(TimeSpan))
{
return Binding.DoNothing;
}
var formatstring = parameter as string;
if (string.IsNullOrWhiteSpace(formatstring))
{
return TimeSpan.Parse(input);
}
var parser = new FormattedTimeSpanParser(formatstring);
return parser.Parse(input);
}
