Can I add/subtract value that is bound to an element property?

Question

Does XAML allows modification of bound value?
Like Width="{Binding Elementname="lstMine", Path=Width}" -100 ? So that I can have a relative value.

Answer 1

You can use converters for this purpose, and my WPF Converters library includes an ExpressionConverter that allows you to do exactly that:

Width="{Binding Width, ElementName=lstMine, Converter={con:ExpressionConverter {}{0}-100}}"

Answer 2

use Converter for these purpose