c# - How to write a custom dependecy property and data bind to custom type? -


i have project in winrt environment trying extend functionality of standard gridview control extending it. goal change selecteditems behaviour of gridview.

public class mygridview : gridview {      /// <summary>     ///  replacement of selecteditems     /// </summary>     public iobservablevector<object> appitems     {         { return getvalue(appselecteditemsproperty) iobservablevector<object>; }         set { setvalue(appselecteditemsproperty, value);         appitems.vectorchanged += appselecteditemschanged;         }     }      /// <summary>     /// identifies appselecteditems dependency property.     /// </summary>     public static readonly dependencyproperty appselecteditemsproperty =             dependencyproperty.register(             "appitems",             typeof(iobservablevector<object>),             typeof(appgridview),             new propertymetadata(null, appitemspropertycallback));      ….     ….     ...    }

in xaml file have following..

<xx    …….    <appcontrols:appgridview  appitems="{binding contactslistselecteditems, mode=twoway } }">        .…         …    </appcontrols:appgridview >    …..    …….   /xx>

the final piece of code mvvm class bound datacontext.

 public  class mymodel: basemodel  {    ……    ……..    /// <summary>     /// not working     /// </summary>     private  iobservablevector<contact> _contactslistselecteditems;     public iobservablevector<contact> contactslistselecteditems     {                 {             return (iobservablevector<contact>)_contactslistselecteditems;         }         set         {             setproperty<iobservablevector<contact>>(ref _contactslistselecteditems, value);                       }     }   ….  …. }

i found implementation of iobservablevector here : https://gist.github.com/runceel/2437074

the data binding contactslistselecteditems not working giving following error:

error: cannot 'contactslistselecteditems' value (type 'object') type 'consius.activework.pages.contactpage.contactpageviewmodel, consius.activework, version=1.0.0.0, culture=neutral, publickeytoken=null'. bindingexpression: path='contactslistselecteditems' dataitem='consius.activework.pages.contactpage.contactpageviewmodel, consius.activework, version=1.0.0.0, culture=neutral, publickeytoken=null'; target element 'consius.activework.controls.appgridview' (name='contactslist'); target property 'appitems' (type 'iobservablevector`1<object>').

if change type of contactslistselecteditems to:

iobservablevector<object>

it works well.

this not acceptable solution me, writing mvvm class using class object.

is there out there can give me hint whats wrong?

have tried observablecollection instead of iobservablevector , custom implementation found?


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