c# - Listbox ItemTemplate Selector does not pick a template -
i trying use itemtemplateselector on listbox within grid creating on different file later called mainwindow.
here datatemplateselector code
public class templateselector : datatemplateselector { public override datatemplate selecttemplate(object item, dependencyobject container) { frameworkelement element = container frameworkelement; if (element != null && item != null && item myclass) { myclass agg = item myclass; if(agg.mytype == a) { return element.findresource("greenitemtemplate") datatemplate; } else if (agg.mytype == b) { return element.findresource("yellowitemtemplate") datatemplate; } else if (agg.mytype == c) { return element.findresource("reditemtemplate") datatemplate; } } return null; } } here xaml
<grid x:class="ns.views.listview" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:c="clr-namespace:ns.commons" datacontext="{binding}"> <grid.resources> <c:myconverter x:key="converter" /> <c:templateselector x:key="borderselector" /> <datatemplate x:key="greenitemtemplate"> <border borderthickness="3" borderbrush="green"> <stackpanel horizontalalignment="stretch"> <textblock text="{binding path=groupname}"/> <textblock text="{binding path=mytype}"/> </stackpanel> </border> </datatemplate> <datatemplate x:key="reditemtemplate"> <border borderthickness="3" borderbrush="red"> <stackpanel horizontalalignment="stretch"> <textblock text="{binding path=groupname}"/> <textblock text="{binding path=mytype}"/> </stackpanel> </border> </datatemplate> <datatemplate x:key="yellowitemtemplate"> <border borderthickness="3" borderbrush="yellow"> <stackpanel horizontalalignment="stretch"> <textblock text="{binding path=groupname}"/> <textblock text="{binding path=mytype}"/> </stackpanel> </border> </datatemplate> </grid.resources> <listbox itemssource="{binding mycollectionofmyclassobjects}" name="listbox1" horizontalcontentalignment="stretch" itemtemplateselector="{staticresource borderselector}" > </listbox> however, although binding works fine (the list of non-formatted objects appears in list), itemtemplateselector not calling templateselector methods. put breakpoint @ beginning of methods , it's never called.
does knows problem?
@rachel right. datatemplateselector gets invoked once @ load pretty , not inpc changes.
what can require use listboxitemstyle datatrigger switching template used
something like:
<controltemplate x:key="greenitemtemplate"> <border borderbrush="green" borderthickness="3"> <stackpanel horizontalalignment="stretch"> <textblock text="{binding path=groupname}" /> <textblock text="{binding path=mytype}" /> </stackpanel> </border> </controltemplate> <controltemplate x:key="reditemtemplate"> <border borderbrush="red" borderthickness="3"> <stackpanel horizontalalignment="stretch"> <textblock text="{binding path=groupname}" /> <textblock text="{binding path=mytype}" /> </stackpanel> </border> </controltemplate> <controltemplate x:key="yellowitemtemplate"> <border borderbrush="yellow" borderthickness="3"> <stackpanel horizontalalignment="stretch"> <textblock text="{binding path=groupname}" /> <textblock text="{binding path=mytype}" /> </stackpanel> </border> </controltemplate> <style x:key="mylistboxitemstyle" targettype="{x:type listboxitem}"> <setter property="template" value="{dynamicresource greenitemtemplate}" /> <style.triggers> <datatrigger binding="{binding mytype}" value="c"> <setter property="template" value="{dynamicresource reditemtemplate}" /> </datatrigger> <datatrigger binding="{binding mytype}" value="b"> <setter property="template" value="{dynamicresource yellowitemtemplate}" /> </datatrigger> </style.triggers> </style> and usage:
<listbox itemcontainerstyle="{staticresource mylistboxitemstyle}" itemssource="{binding mycollectionofmyclassobjects}" name="listbox1" horizontalcontentalignment="stretch" /> 
