object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
object converter = Converter;
if (converter == null)
{
return(value);
}
object converterParameter = ConverterParameter;
SourceValuesErrors = null;
try
{
if (converter is IMultiValueConverter)
{
// Guess target types based on current source values
Type[] targetTypes = new Type[m_sourceCount];
for (int i = 0; i < targetTypes.Length; i++)
{
object currentValue = Target.GetValue(dataProperties[m_sourceStartIndex + i]);
targetTypes[i] = currentValue != null?currentValue.GetType() : typeof(Object);
}
object[] convertedValues = ((IMultiValueConverter)converter).ConvertBack(value, targetTypes, converterParameter, culture);
return(convertedValues);
}
else if (converter is IValueConverter)
{
object convertedValue = ((IValueConverter)converter).ConvertBack(value, targetType, converterParameter, culture);
return(convertedValue != DependencyProperty.UnsetValue ? new object[] { convertedValue } : convertedValue);
}
}
catch (Exception ex)
{
SourceValuesErrors = new MultiBindingValidationError[] { new MultiBindingValidationError(ex) };
if (MultiBinding.ValidatesOnExceptions)
{
return(DependencyProperty.UnsetValue);
}
throw;
}
return(value);
}
object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null)
{
return(DependencyProperty.UnsetValue);
}
object[] unconvertedValues = (object[])value;
object converter = Converter;
object result = unconvertedValues;
if (converter != null)
{
object converterParameter = ConverterParameter;
SourceValuesErrors = null;
try
{
IMultiValueConverter multiConverter = converter as IMultiValueConverter;
if (multiConverter != null)
{
result = multiConverter.Convert(unconvertedValues, targetType, converterParameter, culture);
}
else
{
IValueConverter singleConverter = converter as IValueConverter;
if (singleConverter != null)
{
result = singleConverter.Convert(unconvertedValues[0], targetType, converterParameter, culture);
}
}
}
catch (Exception ex)
{
SourceValuesErrors = new MultiBindingValidationError[] { new MultiBindingValidationError(ex) };
if (MultiBinding.ValidatesOnExceptions)
{
return(DependencyProperty.UnsetValue);
}
throw;
}
}
if (result != DependencyProperty.UnsetValue)
{
String format = StringFormat;
if (format != null)
{
format = Regex.Replace(format, @"%(\d+)", "{$1}");
if (result is Object[])
{
result = String.Format(culture, format, (Object[])result);
}
else
{
result = String.Format(culture, format, result);
}
}
}
return(result);
}
