.net - Implementing a custom Binding -

i have myusercontrol contains label label, , bo public person person {get;set;}.

i want person's name bind label this:

("name: {0}", person.name), in case if person != null
and
("name: {0}", "(none)"), in case if person == null

more that, if person name changed, label automatically update it.

is there possibility such binding?

"dirty" variant:

private void label_layoutupdated(object sender, eventargs e) {     label.content = string.format("name: {0}", _person == null ?                                                        "(none)" : _person.name); } 

how about:

    <stackpanel orientation="horizontal">         <textblock text="name: "/>         <textblock text="{binding person.name, fallbackvalue='(none)'}"/>     </stackpanel> 

this doesn't use label, accomplishes goal.

---

if needs label, can this:

    <label content="{binding person.name, fallbackvalue='(none)'}"             contentstringformat="name: {0}"/> 

one caveat both approaches text display name: (none) if binding incorrect (person == null equivalent behavior no property person found).