c# - Xamarin MVVM Custom Model Properties? -


say have readonly model...

[datacontract] public partial class person {     [datamember]     public virtual string lastname { get; set; }      [datamember]     public virtual string firstname { get; set; } }

a view...

<?xml version="1.0" encoding="utf-8"?> <contentpage     xmlns="http://xamarin.com/schemas/2014/forms"      xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"      x:class="theapp.apage"     backgroundcolor="#03264a"     padding="0,0,0,0">     <contentpage.content>         <stacklayout             backgroundcolor="transparent">             <listview                  itemssource="{binding personsearchcollection}">                 <listview.itemtemplate>                     <datatemplate>                         <viewcell>                             <label                                 text="{binding firstname}" />                         </viewcell>                     </datatemplate>                 </listview.itemtemplate>             </listview>         </stacklayout>     </contentpage.content> </contentpage>

and viewmodel (basic idea)

namespace theapp.viewmodels {     public class apagepageviewmodel : helpers.bindablebase {          private observablecollection<person> _personsearchcollection = new rangeobservablecollection<person>();          public observablecollection<person> personsearchcollection {             { return _personsearchcollection; }             set { setproperty(ref _personsearchcollection, value); }         }     } }

my listview bound observablecollection of type: person. gets filled servicestack call when user types name search.

currently label in datatemplate bound firstname, new property: fullname (person.firstname+" "+person.lastname).

how add property model cannot edit? need separate vm model , change observablecollection of type instead? examples great!

sorry if basic question, i'm new xamarin.

thank you!

change view cell

<viewcell>  <stacklayout orientation="horizontal">   <label text="{binding firstname}"   <label text=" "   <label text="{binding lastname}"  </stacklayout> </viewcell>

other way

  1. define 1 custom object

    public class customperson     {         public customperson(person p)         {             firstname = p.firstname;             lastname = p.lastname;         }         public string firstname { get; set; }         public string lastname { get; set; }         public string fullname         {             { return string.format("{0} {1}", firstname, lastname);}         }      }

(2) define 1 collection getter 

public ienumerable<customperson> customcollection  {   { return _personsearchcollection.select(p => new customperson(p)); }  }

when updating person search collection raise property change custom collection.

  1. finally binding customcollection

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