Question

What I want is to bind a string to a textblock or datatrigger (basically some WPF object) and take a part of the string. This string will be delimited. So, for example, I have this string:

String values = "value1|value2";

And I have two controls – txtBlock1 and txtBlock2.

In txtBlock1 I would like to set the Text property like Text={Binding values}.
In txtBlock2 I would like to set the Text property like Text={Binding values}.

Obviously this will display the same string so I need some sort of StringFormat expression to add to this binding to substring values so that txtBlock1 reads value1 and txtBlock2 reads value2.

I’ve had a good read about and it seems like this: Wpf Binding Stringformat to show only first character is the typical proposed solution. But it seems awfully long-winded for what I’m trying to achieve here.

Thanks a lot for any help in advance.

Answer 1

What you need here is a converter.
Add a converter parameter to indicate the index.

public class DelimiterConverter : IValueConverter
{
    public object Convert(Object value, Type targetType, object parameter, CultureInfo culture)
    {
        string[] values = ((string)value).Split("|");
        int index = int.Parse((string)parameter);
        return values[index];
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return "";
    }

Then you just specify the index of the value in XAML with the ConverterParameter attribute.