c# - WPF Multiple CollectionView with different filters on same collection -

i'm using observablecollection 2 icollectionview different filters.

one filtering messages type, , 1 counting checked messages. can see message filter , message count works ok, when i'm un-checking message disappear list (the count still working).

btw sorry long post, wanted include relevant stuff.

the xaml code:

<!-- messages list --> <dockpanel grid.row="1"            grid.column="0"            grid.columnspan="3"            height="500">   <listbox name="listboxzone"            itemssource="{binding filteredmessagelist}"            background="transparent"            borderthickness="0">     <listbox.itemtemplate>       <datatemplate>         <checkbox name="checkboxzone"                   content="{binding text}"                   tag="{binding id}"                   unchecked="checkboxzone_unchecked"                   foreground="whitesmoke"                   margin="0,5,0,0"                   ischecked="{binding ischecked}" />       </datatemplate>     </listbox.itemtemplate>   </listbox> </dockpanel> <button content="test add new"         grid.column="2"         height="25"         horizontalalignment="left"         margin="34,2,0,0"         click="button1_click" /> <label content="{binding checkedmessagelist.count}"        grid.column="2"        height="25"        margin="147,2,373,0"        width="20"        foreground="white" /> 

screenshot:

code:

/* viewmodel class */ public class mainviewmodel : inotifypropertychanged {      // constructor     public mainviewmodel()     {         #region filteredmessagelist         // connect observablecollection collectionview         _filteredmessagelist = collectionviewsource.getdefaultview(messagelist);         // set filter          _filteredmessagelist.filter = delegate(object item)         {             messageclass temp = item messageclass;              if ( selectedfilter.equals(availablefilters.all) )             {                 return true;             }             else             {                 return temp.filter.equals(_selectedfilter);             }         };         #endregion          #region checkedmessagelist         // connect observablecollection collectionview         _checkedmessagelist = collectionviewsource.getdefaultview(messagelist);         // set filter          _checkedmessagelist.filter = delegate(object item) { return (item messageclass).ischecked; };         #endregion     }      // message list     private observablecollection<messageclass> _messagelist =             new observablecollection<messageclass>();     public observablecollection<messageclass> messagelist     {         { return _messagelist; }         set { _messagelist = value; }     }      // collectionview (filtered messagelist)     private icollectionview _filteredmessagelist;     public icollectionview filteredmessagelist     {         { return _filteredmessagelist; }     }      // collectionview (filtered messagelist)     private icollectionview _checkedmessagelist;     public icollectionview checkedmessagelist     {         { return _checkedmessagelist; }     }      // selectedfilter property     private availablefilters _selectedfilter = availablefilters.all; // default set     public availablefilters selectedfilter     {         { return _selectedfilter; }         set         {             _selectedfilter = value;             raisepropertychanged("selectedfilter");             _filteredmessagelist.refresh(); // refresh list upon update         }     }      // filterlist (convert enum collection)     private list<keyvaluepair<string, availablefilters>> _availablefilterslist;     public list<keyvaluepair<string, availablefilters>> availablefilterslist     {                 {             /* check if such list available, if not create first use */             if (_availablefilterslist == null)             {                 _availablefilterslist = new list<keyvaluepair<string, availablefilters>>();                 foreach (availablefilters filter in enum.getvalues(typeof(availablefilters)))                 {                     string description;                     fieldinfo fieldinfo = filter.gettype().getfield(filter.tostring());                     descriptionattribute[] attributes =                                 (descriptionattribute[])fieldinfo.getcustomattributes(typeof(descriptionattribute), false);                      /* if not null description */                     if (attributes != null && attributes.length > 0)                     {                         description = attributes[0].description;                     }                     else                     {                         description = string.empty;                     }                      /* add new item filterlist */                     keyvaluepair<string, availablefilters> typekeyvalue =                                 new keyvaluepair<string, availablefilters>(description, filter);                      _availablefilterslist.add(typekeyvalue);                 }             }             return _availablefilterslist;         }     }      #region implement inotifypropertychanged     public event propertychangedeventhandler propertychanged;     public void raisepropertychanged(string propertyname)     {         propertychangedeventhandler handler = propertychanged;         if (handler != null) handler(this, new propertychangedeventargs(propertyname));     }     #endregion } 

code un-check function

private void checkboxzone_unchecked(object sender, routedeventargs e) {     checkbox chkzone = (checkbox)sender;     ucsystemmessagevm.checkedmessagelist.refresh(); } 

this answer helped me exact problem. static collectionviewsource.getdefaultview(coll) method return same reference given collection, basing multiple collection views on same reference counterproductive. instantiating view follows:

icollectionview filteredview = new collectionviewsource { source=messagelist }.view; 

the view can filtered/sorted/grouped independently of others. can apply filtering.

i know it's been couple months , have solved problem now, ran across question when had same problem figured add answer.