Conditional element in xaml depending on the binding content

Question

Is it possible to display this TextBlock, only if the Address.Length > 0 ? I\'d like to do this directly into the xaml, I know I could put all my controls pr

Answer 1

Basically, you're going to need to write an IValueConverter so that you can bind the Visibility property of your TextBox to either the Address field, or a new field that you create.

If you bind to the Address field, here's how the binding might look like::

And then StringLengthVisiblityConverter could look something like this:

public class StringLengthVisiblityConverter: IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value == null || value.ToString().Length == 0)
        {
            return Visibility.Collapsed;
        }
        else
        {
            return Visibility.Visible;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        // Don't need to implement this
    }
}

Then you'd just need to add your converter as a resource, using syntax like this (where src is mapped to the namespace where the converter is defined):