Question

I have a converter that takes in a IEnumerable and returns one string with multiple lines. The convertback function does the opposite, takes in a string with multiple lines and returns a List. I’m using it in a few places and it works great.

My question is, I now have locations where I want to use the Convert and ConvertBack functions in reverse (e.g. on a OneWay binding, it uses the ConvertBack function) Is this possible in XAML?

Answer 1

Creating such a converter is possible, for example:

class ListStringConverter : IValueConverter
{
   public bool IsListToString { get; set; }

    public ListStringConverter()
    {
        IsListToString = true;
    }

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return IsListToString ? FromListToString(value) : FromStringToList(value);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return IsListToString ? FromStringToList(targetListItem) : FromListToString(targetListItem);
    }


    public object FromListToString(object list)
    {
       .... // Conversion Logic
    }

    public object FromStringToList(object myString)
    {
       .... // Conversion Logic
    }

}

In the XAML you can declare it like this

<ListStringConverter x:Key="StringToListConverter " IsListToString ="False" />