c# - wpf MVVM set constructor -

for example have window 2 columns. in first column want show items have property isfavorite = true in second isfavorite = false. when using simleioc container seems coudnot change parameter's in view. need create different viewmodel each view? or how can manipulate listviewmodel in way?

listviewmodel

namespace wpfapplication169.viewmodel { /// <summary> /// class contains properties view can data bind to. /// <para> /// see http://www.galasoft.ch/mvvm /// </para> /// </summary> public class listviewmodel : viewmodelbase {     /// <summary>     /// initializes new instance of listviewmodel class.     /// </summary>     ///      public observablecollection<liststruct> items { get; set; }     public listviewmodel()     {         items = new observablecollection<liststruct>();         items.add(new liststruct { carname = "toyota", isfavorite = true});         items.add(new liststruct { carname = "dongfeng", isfavorite = false });     } }    public class liststruct {     public bool isfavorite {get;set;}     public string carname {get;set;} } } 

mainviewmodel

namespace wpfapplication169.viewmodel { public class mainviewmodel : viewmodelbase {     /// <summary>     /// initializes new instance of mainviewmodel class.     /// </summary>     public mainviewmodel()     {      } } } 

listviewxaml.cs:

<usercontrol x:class="wpfapplication169.listview"          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"          xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"           mc:ignorable="d"           d:designheight="300" d:designwidth="300"          datacontext="{binding path=listviewmodel, source={staticresource locator}}"> <grid>     <itemscontrol itemssource="{binding items}">         <itemscontrol.itemtemplate>             <datatemplate>                 <label content="{binding carname}"></label>             </datatemplate>         </itemscontrol.itemtemplate>     </itemscontrol> </grid> 

mainwindow.xaml.cs

    <grid>     <grid.rowdefinitions>         <rowdefinition height="auto"></rowdefinition>         <rowdefinition></rowdefinition>     </grid.rowdefinitions>     <grid.columndefinitions>         <columndefinition></columndefinition>         <columndefinition></columndefinition>     </grid.columndefinitions>     <view:listview grid.column="0" grid.row="1"></view:listview>     <view:listview grid.column="1" grid.row="1"></view:listview>     <label grid.column="0" grid.row="0" content="isfavorite"></label>     <label grid.column="1" grid.row="0" content="notfavorite"></label> </grid> 

1. tell user control want favorite/notfavorite items. adding public property showfavorite our usercontrol.

2. we need filter our itemssource according showfavorite. applying filtering on original collection. our listviewmodel doesn't know happening.

   public partial class listview : usercontrol { public listview() {     this.initializecomponent(); }  bool _showfavorite; public bool showfavorite{     get{return _showfavorite;}     set{_showfavorite = value;          if(value == true)         {             collectionview v = (collectionview)collectionviewsource.getdefaultview(myitemscontrol.itemssource);             v.filter = (i)=>{return ((liststruct)i).isfavorite==true;};             v.refresh();         }         else             {             collectionview v = (collectionview)collectionviewsource.getdefaultview(myitemscontrol.itemssource);             v.filter = (i)=>{return ((liststruct)i).isfavorite==false;};             v.refresh();         }     } } 

   }

i can't make code work, changed it.

<usercontrol         x:class="wpfapp1.listview"         ...         xmlns:viewmodel="clr-namespace:wpfapp1"         ...         >  <usercontrol.datacontext>     <viewmodel:listviewmodel/> </usercontrol.datacontext>  <grid x:name="mygrid">     <itemscontrol x:name="myitemscontrol" itemssource="{binding items}">         <itemscontrol.itemtemplate>             <datatemplate>                 <label content="{binding carname}"></label>             </datatemplate>         </itemscontrol.itemtemplate>     </itemscontrol> </grid>  </usercontrol> 

mainviewmodel.cs

using system; using system.componentmodel; using system.collections; using system.collections.generic; using system.collections.objectmodel;  namespace wpfapp1 {     public class mainviewmodel     {         public listviewmodel mylistviewmodel{get;set;}         public mainviewmodel()         {             mylistviewmodel = new listviewmodel();         }     }      public class listviewmodel     {         public observablecollection<liststruct> items { get; set; }         public listviewmodel()         {             items = new observablecollection<liststruct>();             items.add(new liststruct { carname = "toyota", isfavorite = true});             items.add(new liststruct { carname = "dongfeng", isfavorite = false });         }        }         public class liststruct     {         public bool isfavorite {get;set;}         public string carname {get;set;}     } } 

mainwindow.xaml

    <view:listview x:name="favoritelistview" grid.column="0" grid.row="1" showfavorite="true"></view:listview>     <view:listview x:name="notfavoritelistview" grid.column="1" grid.row="1" showfavorite="false"></view:listview>      <label grid.column="0" grid.row="0" content="isfavorite"></label>     <label grid.column="1" grid.row="0" content="notfavorite"></label>