c# - WPF User Control Resources -

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i have custom control extending wpf datagrid. inside custom control, resources , control template of grid defined

<datagrid.resources>         <local:visibilityconverter x:key="visibilityconverter" />  <style x:key="columnheadergripperstyle" targettype="{x:type thumb}">             <setter property="width" value="8" />             <setter property="background" value="transparent" />             <setter property="cursor" value="sizewe" />             <setter property="template">                 <setter.value>                     <controltemplate targettype="{x:type thumb}">                         <border padding="{templatebinding padding}" background="{templatebinding background}" />                     </controltemplate>                 </setter.value>             </setter>         </style>            <!--may need commented if clashes other styles-->         <style targettype="{x:type datagridcolumnheader}" x:key="datagridcolumnheaderstyle">             <setter property="foreground" value="#ff000000" />             <setter property="horizontalcontentalignment" value="left" />             <setter property="verticalcontentalignment" value="center" />             <setter property="istabstop" value="false" />             <setter property="separatorbrush" value="#ffc9caca" />             <setter property="padding" value="4" />             <setter property="template">                 <setter.value>                     <controltemplate targettype="datagridcolumnheader">                         <grid x:name="root" height="48">                             <grid.rowdefinitions>                                 <rowdefinition />                                 <rowdefinition height="26" />                             </grid.rowdefinitions>                             <grid.columndefinitions>                                 <columndefinition />                                 <columndefinition width="auto" />                             </grid.columndefinitions>                             <visualstatemanager.visualstategroups>                                 <visualstategroup x:name="commonstates">                                     <visualstate x:name="normal" />                                     <visualstate x:name="mouseover">                                         <storyboard>                                             <coloranimation storyboard.targetname="backgroundrectangle" storyboard.targetproperty="(fill).color" duration="0" to="#ff448dca" />                                             <coloranimation storyboard.targetname="backgroundgradient" storyboard.targetproperty="(fill).(gradientstops)[3].color" duration="0" to="#7fffffff" />                                             <coloranimation storyboard.targetname="backgroundgradient" storyboard.targetproperty="(fill).(gradientstops)[2].color" duration="0" to="#ccffffff" />                                             <coloranimation storyboard.targetname="backgroundgradient" storyboard.targetproperty="(fill).(gradientstops)[1].color" duration="0" to="#f2ffffff" />                                         </storyboard>                                     </visualstate>                                     <visualstate x:name="pressed">                                         <storyboard>                                             <coloranimation storyboard.targetname="backgroundrectangle" storyboard.targetproperty="(fill).color" duration="0" to="#ff448dca" />                                             <coloranimation storyboard.targetname="backgroundgradient" storyboard.targetproperty="(fill).(gradientstops)[0].color" duration="0" to="#d8ffffff" />                                             <coloranimation storyboard.targetname="backgroundgradient" storyboard.targetproperty="(fill).(gradientstops)[1].color" duration="0" to="#c6ffffff" />                                             <coloranimation storyboard.targetname="backgroundgradient" storyboard.targetproperty="(fill).(gradientstops)[2].color" duration="0" to="#8cffffff" />                                             <coloranimation storyboard.targetname="backgroundgradient" storyboard.targetproperty="(fill).(gradientstops)[3].color" duration="0" to="#3fffffff" />                                         </storyboard>                                     </visualstate>                                 </visualstategroup>                                 <visualstategroup x:name="sortstates">                                     <visualstate x:name="unsorted" />                                     <visualstate x:name="sortascending">                                         <storyboard>                                             <doubleanimation storyboard.targetname="sorticon" storyboard.targetproperty="opacity" duration="0" to="1.0" />                                         </storyboard>                                     </visualstate>                                     <visualstate x:name="sortdescending">                                         <storyboard>                                             <doubleanimation storyboard.targetname="sorticon" storyboard.targetproperty="opacity" duration="0" to="1.0" />                                             <doubleanimation storyboard.targetname="sorticon" storyboard.targetproperty="(rendertransform).scaley" duration="0" to="-.9" />                                         </storyboard>                                     </visualstate>                                 </visualstategroup>                             </visualstatemanager.visualstategroups>                             <rectangle x:name="backgroundrectangle" grid.columnspan="2" fill="#ff1f3b53" stretch="fill" />                             <rectangle x:name="backgroundgradient" grid.columnspan="2" stretch="fill">                                 <rectangle.fill>                                     <lineargradientbrush endpoint=".7,1" startpoint=".7,0">                                         <gradientstop color="#fcffffff" offset="0.015" />                                         <gradientstop color="#f7ffffff" offset="0.375" />                                         <gradientstop color="#e5ffffff" offset="0.6" />                                         <gradientstop color="#d1ffffff" offset="1" />                                     </lineargradientbrush>                                 </rectangle.fill>                             </rectangle>                             <grid grid.columnspan="2" margin="0,0,1,1">                                 <border margin="0,0,0,-1" width="14" borderbrush="#ff878787" borderthickness="1,0,0,0" horizontalalignment="right" visibility="collapsed">                                     <path x:name="dropdownindicator" height="5.26" margin="0,2,0,0" width="6.334" data="f1 m-3.0081699e-07,0.010437 l4.0493598,6.9732699 l8.0546999,0 l-3.0081699e-07,0.010437 z" fill="#ff444444" horizontalalignment="center" rendertransformorigin=".5,.5" stretch="uniform" uselayoutrounding="false" verticalalignment="center">                                         <path.rendertransform>                                             <scaletransform scalex=".9" scaley=".9" />                                         </path.rendertransform>                                     </path>                                 </border>                             </grid>                             <grid margin="4,2,9,2" horizontalalignment="{templatebinding horizontalcontentalignment}" verticalalignment="{templatebinding verticalcontentalignment}">                                 <grid.columndefinitions>                                     <columndefinition width="auto" />                                     <columndefinition width="auto" />                                     <columndefinition width="auto" />                                  </grid.columndefinitions>                                 <local:columnoptioncontrol height="13" width="13" />                                                            <!--visibility="{binding path=canusergroup, relativesource={relativesource ancestortype={x:type datagrid}}, converter={staticresource visibilityconverter}}" />-->                                  <contentpresenter grid.column="1" content="{templatebinding content}" />                                 <path x:name="sorticon" grid.column="2" margin="4,0,0,0" width="8" data="f1 m -5.215,6.099l 5.215,6.099l 0,0l -5.215,6.099 z " fill="#ff444444" horizontalalignment="right" opacity="0" rendertransformorigin=".5,.5" stretch="uniform" verticalalignment="center">                                     <path.rendertransform>                                         <scaletransform scalex=".9" scaley=".9" />                                     </path.rendertransform>                                 </path>                             </grid>                             <rectangle x:name="verticalseparator" grid.column="1" width="1" fill="{templatebinding separatorbrush}" verticalalignment="stretch" />  <!--visibility="{templatebinding separatorvisibility}" />-->                             <border grid.columnspan="2" grid.row="1" margin="0" borderbrush="#ffc9caca" borderthickness="0,1,1,0" visibility="{binding path=canuserfilter, relativesource={relativesource ancestortype={x:type datagrid}}, converter={staticresource visibilityconverter}}">                                 <local:columnfiltercontrol margin="0,0,0,1"/> <!--filtervisibility="{binding path=canuserfilter, relativesource={relativesource ancestortype={x:type datagrid}}, converter={staticresource visibilityconverter}}" />-->                             </border>                              <thumb style="{staticresource columnheadergripperstyle}" x:name="part_leftheadergripper" horizontalalignment="left" />                             <thumb style="{staticresource columnheadergripperstyle}" x:name="part_rightheadergripper" horizontalalignment="right" />                         </grid>                     </controltemplate>                 </setter.value>             </setter>         </style>      </datagrid.resources>

and visibilityconverter defined 

[valueconversion(typeof(visibility), typeof(bool))]     class visibilityconverter : ivalueconverter     {          public object  convert(object value, type targettype, object parameter, system.globalization.cultureinfo culture)         {             bool? val = value bool?;              if (val == null) val = false;              visibility visible = (val == false ? visibility.collapsed : visibility.visible);             return visible;         }          public object  convertback(object value, type targettype, object parameter, system.globalization.cultureinfo culture)         {             visibility? visible = value visibility?;             if (visible == null) visible = visibility.collapsed;             bool val = (visible == visibility.collapsed || visible == visibility.hidden ? false : true);              return val;         }     }

in usage of control, when attempt declare resources below, run time exception thrown @ below declaration

'set property 'system.windows.resourcedictionary.deferrablecontent' threw exception.' line number '368' , line position '30'.

with inner exception

{"cannot re-initialize resourcedictionary instance."}

<local:enhancedwpfdatagrid.resources>                             <style targettype="{x:type datagridcell}">                                 <eventsetter event="previewmouseleftbuttondown" handler="datagridcell_previewmouseleftbuttondown"></eventsetter>                             </style>                             <uc:settings x:key="settings"/>                         </local:enhancedwpfdatagrid.resources>

if comment above resources xaml, works fine.

could please shed lights wrong this?

thanks in advance.

i think you're trying redefine resourcedictionary you've created when setting custom control. you've created resource dictionary use control, , you're attempting create again (hence re-initialize exception).

you move styling datagridcell main template (which wouldn't want in case, because of evensetter, presumably instance specific).

a better solution may define style in resourcedictionary , reference it, or add style resources window/page you're using custom control (e.g. add resources of parent grid).

i believe can merge resource dictionaries, although i've never tried it: http://msdn.microsoft.com/en-us/library/aa350178.aspx


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