c# - Two Way Binding Path=. Will Not Save -

public datacontext {   public observerablecollection<int> integers; }  <datagrid itemssource={binding integers, mode=twoway}>    <datagrid.columns>       <datagridtextcolumn binding="{binding path=., updatesourcetrigger=propertychanged, mode=twoway}"/>    </datagrid.columns> </datagrid> 

shows numbers fine. but, if modify something, values never save. can enter 999999 , collection never update index corresponding row.

if made silly wrapper class called integermodel , give integer called "value" , set, change binding path=. binding path=value, works fine.

this site mentions in answer, doesn't know why. i'd know why myself. if inotifypropertychanged event issue, why work normal getter , setter wrapper?

i'm basing on know .net framework's internals. educated guess.

the "silly wrapper class" mention "boxes" integers, value types, object types. permits add implementation of inotifypropertychanged, necessary because binding not observablecollection, instead 1 binding each of elements in observablecollection. gives binding system hooks needs modify integers when changes trigger source update.

it slower operations pure value types, but, if you're operating @ user interface speeds, shouldn't discernible problem.