wpf - Issues with MouseDoubleClick command on TreeViewItem using AttachedProperties -

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i trying attach command , commandparameter property treeviewitem can route mouse double click event command in viewmodel. appears double click event never fired.

mousedoubleclick:

namespace visualinspectionconsole.commands {     public class mousedoubleclick     {         public static dependencyproperty commandproperty =             dependencyproperty.registerattached(                 "command",                 typeof(icommand),                  typeof(mousedoubleclick),                 new uipropertymetadata(commandchanged));         public static dependencyproperty commandparameterproperty =             dependencyproperty.registerattached(                 "commandparameter",                 typeof(object),                 typeof(mousedoubleclick),                 new uipropertymetadata(null));          public static void setcommand(dependencyobject target, icommand value)         {             target.setvalue(commandproperty, value);         }           public static void setcommandparameter(dependencyobject target, object value)         {             target.setvalue(commandparameterproperty, value);         }         public static object getcommandparameter(dependencyobject target)         {             return target.getvalue(commandparameterproperty);         }          private static void commandchanged(             dependencyobject target, dependencypropertychangedeventargs e)         {             control control = target control;             if (control != null)             {                 if ((e.newvalue != null) && (e.oldvalue == null))                 {                     control.mousedoubleclick += onmousedoubleclick;                 }                 else if ((e.newvalue == null) && (e.oldvalue != null))                 {                     control.mousedoubleclick -= onmousedoubleclick;                 }             }         }         private static void onmousedoubleclick(object sender, routedeventargs e)         {             control control = sender control;             ((icommand) control.getvalue(commandproperty)).execute(                 control.getvalue(commandparameterproperty));         }     } }

tree view code in mainwindow.xaml:

<window ...................     xmlns:commands ="clr-namespace:visualinspectionconsole.commands" ...................     <treeview         width="275"         name="tvwwaferlist"         scrollviewer.cancontentscroll="true"         scrollviewer.verticalscrollbarvisibility="visible"         itemssource="{binding treeviewviewmodel.waferlist}"         selectedvaluepath="wafer"         background="{staticresource accentbrushone}"         foreground="black"         fontfamily="segoeui"         fontweight="bold"         margin="1"         borderbrush="{staticresource primarybrush}">         <treeview.itemcontainerstyle>             <style targettype="{x:type treeviewitem}">                 <setter property="foreground" value="{staticresource primarybrush}"/>                 <setter property="fontweight" value="normal"/>                 <setter                     property="commands:mousedoubleclick.command"                     value="{binding selectwafercommand}"/>                 <setter                     property="commands:mousedoubleclick.commandparameter"                     value="{binding}"/>                 <style.triggers>                     <trigger property="isselected" value="true">                         <setter property="fontweight" value="bold"/>                     </trigger>                 </style.triggers>             </style>         </treeview.itemcontainerstyle>         <treeview.itemtemplate>             <hierarchicaldatatemplate itemssource="{binding wafers}">                 <textblock                     text="{binding}"                     foreground="black"/>             </hierarchicaldatatemplate>         </treeview.itemtemplate>     </treeview>

can tell me why mouse double click not working?

edit: getting error in output window:

system.windows.data error: 40 : bindingexpression path error: 'selectwafercommand' property not found on 'object' ''waferhierarchymodel' (hashcode=4494425)'. bindingexpression:path=selectwafercommand; dataitem='waferhierarchymodel' (hashcode=4494425); target element 'treeviewitem' (name=''); target property 'command' (type 'icommand')

so after reading able work correctly. had change commands:mousedoubleclick.commands value

from

{binding selectwafercommand}"

to

{binding datacontext.treeviewviewmodel.selectwafercommand,   relativesource={relativesource findancestor, ancestortype={x:type treeview}}}"

because waferhierarchymodel objects not have selectwafercommand, treeviewviewmodel does. tells execute selectwafercommand found in nearest treeview ancestors datacontext.treeviewviewmodel object.


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