c# - Listview Binding Does Not Update Programmatic Changes -

i've done research on topic, , while i've come across possibilities, nothing has worked me.

details:

i'm working on wpf app using mvvm design pattern. in viewmodel, have list of notes, class few properties (among them, note). i've created property, selectednote on vm hold selected note.

in view, i've bound listview control list qcnotes. i've bound textbox selectednote property. when make changes textbox, correctly reflected in appropriate row of listview.

problem:

i've include revertchanges command. relatively simple command undoes changes i've made note. correctly updates textbox, , updates underlying list correctly, changes not update listview itself. (is necessary use observablecollection in circumstance? i've been asked try , resolve problem without doing so).

attempted fixes

i tried call notifypropertychanged("selectednote") , notifypropertychanged("qcnotes") directly within call revertchanges, hasn't fixed problem.

any ideas?

xaml

<window.datacontext>     <vm:mainprojectviewmodel /> </window.datacontext> <grid>     <stackpanel>         <listview itemssource="{binding qcnotes, updatesourcetrigger=propertychanged, mode=twoway}" x:name="list" selecteditem="{binding selectednote}">             <listview.view>                 <gridview>                     <gridviewcolumn header="note" displaymemberbinding="{binding note}" />                 </gridview>             </listview.view>         </listview>         <textbox           height="30"           horizontalalignment="stretch"           text="{binding selectednote.note, updatesourcetrigger=propertychanged, mode=twoway}"         />         <stackpanel orientation="horizontal" horizontalalignment="center">         <button content="allow edits" command="{binding changestatetoalloweditscommand}" />         <button content="save changes" command="{binding editnotecommand}" />         <button content="revert changes" command="{binding revertchangestonotecommand}" />         </stackpanel>     </stackpanel> </grid> 

viewmodel code

public class mainviewmodel : baseviewmodel   {          private qcnote selectednote;         private string oldnoteforupdating;         private vmstate currentstate;         private string noteinput;         private ilist<qcnote> qcnotes;          public ilist<qcnote> qcnotes         {                         {                 return qcnotes;             }             set             {                 qcnotes = value;                 notifypropertchanged();             }         }          public qcnote selectednote         {                         {                 return selectednote;             }             set             {                 selectednote = value;                 oldnoteforupdating = selectednote.note;                 notifypropertchanged();             }         }          public vmstate currentstate         {                         {                 return currentstate;             }             set             {                 currentstate = value;                 notifypropertchanged();             }         }          public icommand revertchangestonotecommand         {                         {                 return new actioncommand(o => revertchangestonote());             }         }          private void revertchangestonote()         {             qcnotes.first(q => q.id == selectednote.id).note = oldnoteforupdating;             selectednote.note = oldnoteforupdating;             notifypropertchanged("selectednote");             notifypropertchanged("qcnotes");             currentstate = vmstate.view;         } 

i'll post answer own question, don't want deter other offering suggestions.

i implemented inotifypropertychanged interface on models.qcnote class, , resolved issue. initially, interface implemented exclusively on viewmodel. in case, notifypropertychanged called when qcnote object changed, not when properties of object changed.