Question

I have a simple Question.. Is it possible to use binding like this:

<my:{Binding Path=Foo} />

The reason why I want to do this is I need the foo to change by using conditional compilation, for Example:

#if BAR
   var foo = "FooBar"
#endif

Answer 1

As far as I know having dynamic changes to the XAML markup itself is not possible in WPF.
If you do need to have something like this I would suggest that you use one of your possible classes in XAML to keep design support and to have a valid XAML file and then write a little tool that runs through all your xaml files before compilation and exchanges Foo with Bar if a certain condition is met. Obviously you would need to make sure that Foo and Bar are interchangeable too.

Effectively your XAML would look like this

<my:Foo .../>

and your tool would check a condition and then exchange Foo with Bar in all your xaml files.