c# - Binding to DynamicObjects in XAML in WinRT -

i have observablecollection<dynamic> class , xaml refuses bind properties on contained objects.

i know read somewhere xaml supports dynamic , dyanmicobject i'm mightily confused on why not working. other questions, such one, spectacularly un-helpful:

can bind against dynamicobject in winrt / windows 8 store apps

i error @ runtime (and in designer @ design time when hovering on {bindings):

error: bindingexpression path error: 'displayname' property not found on 'premisemetro.light, premisemetro, ... bindingexpression: path='displayname' dataitem='premisemetro.light, premisemetro, ... target element 'windows.ui.xaml.controls.textblock' (name='null'); target property 'text' (type 'string')

please help!

thanks.

a test observableobject class:

class light : dynamicobject, inotifypropertychanged {     private readonly dictionary<string, object> _properties = new dictionary<string, object>();      public event propertychangedeventhandler propertychanged;      public override bool trygetmember(getmemberbinder binder, out object result) {         string name = binder.name;         result = null;         // if property name found in dictionary,          // set result parameter property value , return true.          // otherwise, return false.          object prop;         if (_properties.trygetvalue(name, out prop)) {             result = prop;             return true;         }         return false;     }      // if try set value of property      // not defined in class, method called.      public override bool trysetmember(setmemberbinder binder, object value) {         string name = binder.name;          _properties[name] = value;         if (coreapplication.mainview.corewindow.dispatcher.hasthreadaccess)             onpropertychanged(name);         else             coreapplication.mainview.corewindow.dispatcher.runasync(                 coredispatcherpriority.normal, () => onpropertychanged(name));          // can add value dictionary,          // method returns true.          return true;     }      public object getmember(string propname) {         var binder = binder.getmember(csharpbinderflags.none,                                       propname, gettype(),                                       new list<csharpargumentinfo> {                                           csharpargumentinfo.create(csharpargumentinfoflags.none, null)                                       });         var callsite = callsite<func<callsite, object, object>>.create(binder);          return callsite.target(callsite, this);     }      /// <summary>     ///     sets value of property.     /// </summary>     /// <param name="propertyname">name of property</param>     /// <param name="val">new value</param>     /// <param name="fromserver">if true, not try update server.</param>     public void setmember(string propertyname, object val) {         var binder = binder.setmember(csharpbinderflags.none,                                       propertyname, gettype(),                                       new list<csharpargumentinfo> {                                           csharpargumentinfo.create(csharpargumentinfoflags.none, null),                                           csharpargumentinfo.create(csharpargumentinfoflags.none, null)                                       });         var callsite = callsite<func<callsite, object, object, object>>.create(binder);          callsite.target(callsite, this, val);     }      protected virtual void onpropertychanged(string propertyname) {         propertychangedeventhandler handler = propertychanged;         if (handler != null) handler(this, new propertychangedeventargs(propertyname));     }             } 

a test in mainviewmodel constructor:

light light = new light(); ((dynamic) light).displayname = "test light"; ((dynamic) light).brightness= "27%"; ((dynamic) light).powerstate= false; lights = new observablecollection<dynamic> {     light }; 

my test xaml:

    <grid margin="10" width="1000" verticalalignment="stretch">         <listbox x:name="gdolist" itemssource="{binding path=lights}" >             <listbox.itemtemplate>                 <datatemplate >                     <grid margin="6">                         <stackpanel orientation="horizontal" >                             <textblock text="{binding path=displayname}" margin="5" />                             <textblock text="{binding path=powerstate}" margin="5" />                             <textblock text="{binding path=brightness}" margin="5" />                         </stackpanel>                     </grid>                 </datatemplate>             </listbox.itemtemplate>         </listbox>     </grid> </page> 

can try changing viewmodel to:

dynamic light = new expandoobject(); light.displayname = "test light"; light.brightness = "27%"; light.powerstate = false; var objs = new observablecollection<dynamic> { light }; 

and see if works in lib correctly?