Can we write edit and display methods when we are using list pages in AX2012?
Yes, you can write display method but not edit method.
Infact, display method can be write at table level and you can create the list page for that table and call display method as we are calling it in normal forms.
You can not write edit methods because in Ax 2012, list page is not editable
I assume that we can’t cache these display methods in list pages, either.