xamarin.ios - Updating a ListView with Xamarin.Forms -

i having issue list views on in couple of xamarin forms applications. 1 form within tabbed page setup, other normal content page (different apps)

i have class this

public class someclass {     public string stringone {get;set;}     public string stringtwo {get;set;}     public int intone {get;set;} } 

in content page, set observablecollection , add data in. tell list someclass itemsource. produces listview correctly on of devices.

the problem when change 1 of properties, nothing on listview changes (so if have 3 objects in observable , remove one, list still says 3 - or if change property in second object, second item on listview doesn't change either).

i have tried solve problem using standard list , implement inotifychanged within class. again though, listview doesn't alter when list changes.

i know data has altered if make change object, come out , go in, data has changed in ui.

am doing wrong or bug need putting bugzilla?

it not change if don't bind , implement inotifypropertychanged interface.

sample code:

public class observableproperty : inotifypropertychanged {     public event propertychangedeventhandler propertychanged;      protected void onpropertychanged(string propertyname)     {         var handler = propertychanged;         if (handler != null)             handler(this, new propertychangedeventargs(propertyname));     } }  public class someclass:observableproperty {     string stringone;     string stringtwo;     int intone;     public string stringone      {         get{return stringone;}         set         {             stringone = value;             onpropertychanged("stringone");         }     }      public string stringtwo      {         get{ return stringtwo;}         set         {             stringtwo = value;             onpropertychanged("stringtwo");         }     }      public int intone      {         get{ return intone;}         set         {             intone = value;             onpropertychanged("intone");         }     } }  public class mainvm:observableproperty {     observablecollection<someclass> items;      public observablecollection<someclass> items     {         get{return items;}         set         {             items = value;             onpropertychanged("items");         }     }      public mainvm()     {         items = new observablecollection<someclass>();          items.add(new someclass(){stringone = "123", stringtwo = "test", intone =12});     }      public void callmeforchangingproperty()     {         someclass item = items[0];         item.stringone = "test1";     } }   public class mainview {     public mainview()     {         this.bindingcontext=  new mainvm()     } }    < listview itemssource="{binding items}" rowheight="120">  < listview.itemtemplate>    < datatemplate>      < viewcell>        < viewcell.view>         < stacklayout>             < label text= "stringone" />             < label text= "stringtwo" />             < label text= "intone" />         </ stacklayout>        </ viewcell.view>      </ viewcell>    </ datatemplate>  </ listview.itemtemplate> </ listview>