c# - How do I bind to one data source but update trigger from another? -

i have textbox oneway binding string property, , i'd update when other property on datacontext changes. datacontext observablecollection , textbox displays statistics collection. want statistics updated whenever collection changes, don't want have raise dummy "statistics changed" event.

in other words, xaml (or databinding generally) allow me specify 1 binding data of control , update event?

if understand correctly, there easier way achieve want:

<listbox itemssource={binding items} />  <textbox text="{binding items/propertyname}" /> 

assuming observablecollection has bindable property named propertyname in , view model (or datacontext) has property called items of type of observablecollection, textbox control display propertyname value of selected item in collection.

you can find out more '/' path syntax propertypath xaml syntax page on msdn.