c# - Why the ItemsControl doesn't show all -

i have itemscontrol.

    <dockpanel height="280">         <border cornerradius="6" borderbrush="gray" background="lightgray" borderthickness="2" >             <scrollviewer verticalscrollbarvisibility="auto">                 <itemscontrol height="400" name="ictodolist" itemssource="{binding items}">                     <itemscontrol.itemtemplate>                         <datatemplate>                             <grid name="todolist">                                 <grid.rowdefinitions>                                     <rowdefinition height="*"/>                                     <rowdefinition height="*"/>                                     <rowdefinition height="*"/>                                     <rowdefinition height="*"/>                                 </grid.rowdefinitions>                                 <textblock text="{binding starttime, fallbackvalue=' '}" grid.row="0"/>                                 <textblock text="{binding connectedtime, fallbackvalue=' '}" grid.row="1"/>                                 <textblock text="{binding disconnectedtime, fallbackvalue=' '}" grid.row="2"/>                                 <textblock text="{binding dialingresult, fallbackvalue=' '}" grid.row="3"/>                             </grid>                         </datatemplate>                     </itemscontrol.itemtemplate>                 </itemscontrol>             </scrollviewer>         </border>     </dockpanel> 

in mainviewmodel.cs, have:

    public class mainviewmodel : notifyuibase     public observablecollection<calls> items = new observablecollection<calls>();     public observablecollection<calls> items     {         { return items; }         set         {             items = value;             raisepropertychanged();         }     } 

and:

 public class notifyuibase : inotifypropertychanged  {     // minimal implementation of inotifypropertychanged matching msdn     // note dependent on .net 4.5+ because of callermembername     public event propertychangedeventhandler propertychanged;     public void raisepropertychanged([callermembername] string propertyname = "")     {         if (propertychanged != null)         {             propertychanged(this, new propertychangedeventargs(propertyname));         }     } 

then in code behind: mainviewmodel _datacontext;

    public mainwindow()     {         initializecomponent();         _datacontext = new mainviewmodel();         this.datacontext = _datacontext;   dictionary<string, string> dict = new dictionary<string, string>(); dict = runscript(); calls c = new calls(); c.starttime = dict["starttime"]; c.connectedtime = dict["connectedtime"]; c.disconnectedtime = dict["disconnectedtime"]; c.dialingresult = dict["dialingresult"] + '\n'; dispatcher.begininvoke((action)delegate() {     if (c != null)         _datacontext.items.add(c); }); 

edit:

to add calls, used actionblock in async task method.

var actionblock = new actionblock<t>( t=>   {         dictionary<string, string> dict = new dictionary<string, string>();         dict = runscript(t);         calls c = new calls();         // c dict          dispatcher.begininvoke((action)delegate()          {              if (c != null)               _datacontext.items.add(c);      });       },          executiondataflowblockoptions);         // link bufferblock actionblock            await actionblock.completion; 

suppose have 100 calls, expected output on screen should have 100 sets data. sure not null. displays 6 data sets, why?

finally, itemscontrol doesn't work scrollviewer, that's why not seeing items. removing scrollviewer element , add 1 control template of itemscontrol setting template property:

<dockpanel height="280">         <border cornerradius="6" borderbrush="gray" background="lightgray" borderthickness="2" >             <itemscontrol name="ictodolist" itemssource="{binding items}">                 <itemscontrol.itemtemplate>                     <datatemplate>                         <grid name="todolist">                             <grid.rowdefinitions>                                 <rowdefinition height="*"/>                                 <rowdefinition height="*"/>                                 <rowdefinition height="*"/>                                 <rowdefinition height="*"/>                             </grid.rowdefinitions>                             <textblock text="{binding starttime, fallbackvalue=' '}" grid.row="0"/>                             <textblock text="{binding connectedtime, fallbackvalue=' '}" grid.row="1"/>                             <textblock text="{binding disconnectedtime, fallbackvalue=' '}" grid.row="2"/>                             <textblock text="{binding dialingresult, fallbackvalue=' '}" grid.row="3"/>                         </grid>                     </datatemplate>                 </itemscontrol.itemtemplate>                 <itemscontrol.template>                     <controltemplate>                         <scrollviewer x:name="scrollviewer" padding="{templatebinding padding}">                             <itemspresenter />                         </scrollviewer>                     </controltemplate>                 </itemscontrol.template>             </itemscontrol>         </border>     </dockpanel>