xamarin - How to get list of login users-pubnub -

i trying chat application through pubnub in xamarin.forms,i can able login channel understood keeping break points.now trying list of people had logged in channel.

<contentpage.content>     <stacklayout horizontaloptions="fillandexpand" verticaloptions="fillandexpand">         <label text="welcome" textcolor="blue" horizontaloptions="center" verticaloptions="center">             <label.fontsize>                 <onidiom x:typearguments="x:double">                     <onidiom.phone>                         <onplatform x:typearguments="x:double" ios="20" android="20" winphone="20" />                     </onidiom.phone>                     <onidiom.tablet>                         <onplatform x:typearguments="x:double" ios="30" android="30" winphone="30" />                     </onidiom.tablet>                 </onidiom>             </label.fontsize>         </label>         <listview x:name="loginuserlist" itemssource="{binding loginuserlist}"itemselected="loginuserlist_onitemselected">             <listview.itemtemplate>                 <datatemplate>                     <viewcell>                         <stacklayout orientation="horizontal">                             <label text="{binding username}" textcolor="skyblue" fontsize="20" horizontaloptions="center" verticaloptions="center"></label>                         </stacklayout>                     </viewcell>                 </datatemplate>             </listview.itemtemplate>         </listview>     </stacklayout> </contentpage.content> 

here how can display list of logged in users.

public class chatlistviewmodel : inotifypropertychanged {     private list<userdto> _loginuserlist;     private string _offlineimagesource;     private bool _offlinevisibility;     private string _username;      public chatlistviewmodel()     {         initializedata();         getallusersfromserver();     }      public event propertychangedeventhandler propertychanged;      public list<userdto> loginuserlist     {         { return _loginuserlist; }         set         {             _loginuserlist = value;             onpropertychanged();         }     }      public string offlineimagesource     {         { return _offlineimagesource; }         set         {             _offlineimagesource = value;             onpropertychanged();         }     }      public string username     {         { return _username; }         set         {             _username = value;             onpropertychanged();         }     }      public bool offlinevisibility     {         { return _offlinevisibility; }         set         {             _offlinevisibility = value;             onpropertychanged();         }     }      private async void getallusersfromserver()     {        loginuserlist = await userservice.instance.getallusers();     }              protected virtual void onpropertychanged([callermembername] string propertyname = null)     {         propertychanged?.invoke(this, new propertychangedeventargs(propertyname));     }      private void initializedata()     {         offlineimagesource = "blackcircle.png";     } } 

here viewmodel list displaying purpose.

you can list of active subscribers/users on pubnub channel using on "connect" callback. supply on "connect" function called when new or existing user connects. when occurs, relay information needed on end.

i show example code:

pubnub.subscribe({     channel    : "hello_world",      // connect channel.     callback   : function(message){} // received message.     connect    : function() {        // connection established.         // new user or existing user has         // connected.  send details server.          // ---------------------------------------         // psudo-code example function:         // ---------------------------------------         psudo_post_url( "http://www.mywebsite.com/pubnub-user-connected", {             "user_id" : 123456789,             "channel" : "hello_word"         } );     } }) 

wiki