wpf - Must have non-null value for 'Setter.Property' -


i reading this article on msdn site, in order understand datatrigger.

i have created defaultviewmodel class looks this.

        namespace controltemplatedemo {     public class defaultviewmodel     {         private list<todoitem> _list;          public defaultviewmodel()         {             _list = new list<todoitem>();             _list.add(new todoitem { taskname="wedding",priority = 1,description="important wedding",typeoftask = tasktype.home});             _list.add(new todoitem { taskname = "toyota meeting", priority = 3, description = "wsr", typeoftask = tasktype.work });         }          public list<todoitem> tasks         {             { return _list; }         }     } }

and xamal code this.

<window x:class="controltemplatedemo.mainwindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"     xmlns:local="clr-namespace:controltemplatedemo"     xmlns:sys="clr-namespace:system;assembly=mscorlib"     title="mainwindow" height="350" width="525"> <window.resources>      <datatemplate  datatype="{x:type local:todoitem}">         <border borderthickness="1"  name="myborder" margin="5" padding="5" borderbrush="aqua">             <grid>                 <grid.rowdefinitions>                     <rowdefinition/>                     <rowdefinition/>                     <rowdefinition/>                 </grid.rowdefinitions>                 <grid.columndefinitions>                     <columndefinition/>                     <columndefinition/>                 </grid.columndefinitions>                 <textblock text="task name" grid.row="0" grid.column="0"/>                 <textblock text="{binding taskname}" grid.row="0" grid.column="1"/>                  <textblock text="description:" grid.row="1" grid.column="0"/>                 <textblock text="{binding description}" grid.row="1" grid.column="1" />                  <textblock text="priority:" grid.row="2" grid.column="0"/>                 <textblock text="{binding priority}"  grid.row="2" grid.column="1"/>                                                     </grid>         </border>         <datatemplate.triggers>             <datatrigger binding="{binding path=typeoftask}">                 <datatrigger.value>                     <local:tasktype>home</local:tasktype>                 </datatrigger.value>                 <setter targetname="myborder" property="background" value="yellow" />             </datatrigger>              <multidatatrigger>                 <multidatatrigger.conditions>                     <condition binding="{binding path=priority}">                         <condition.value>                             <sys:int32>3</sys:int32>                         </condition.value>                     </condition>                     <condition binding="{binding path=description}">                         <condition.value>                             <sys:string>wsr</sys:string>                         </condition.value>                     </condition>                 </multidatatrigger.conditions>                 <setter>                     <setter.targetname>myborder</setter.targetname>                     <setter.property>background</setter.property>                     <setter.value>green</setter.value>                 </setter>             </multidatatrigger>          </datatemplate.triggers>      </datatemplate>      <!--<local:defaultviewmodel x:key="dvm"/>--> </window.resources> <grid>     <stackpanel>         <textblock name="blah" fontsize="20" text="my tasks."/>         <listbox x:name="lsttasks" itemssource="{binding path=tasks}" horizontalcontentalignment="stretch" >         </listbox>     </stackpanel> </grid>

qeustion/problem:
using datatemplate reder data inside listbox. intention highlight background of border ( border of list item ) depending on multiple conditions. e.g. if taskpriorty 3 , taskdescription 'wsr' want highlight list item red color. when running application getting runtime error below message. must have non-null value 'setter.property'.

can me find out problem? without multidatatrigger working fine.

thanks, hemant

use attribute syntax instead of property element syntax

<multidatatrigger>     <multidatatrigger.conditions>     ...     </multidatatrigger.conditions>     <setter targetname="myborder" property="background" value="green"/> </multidatatrigger>

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