c# - WPF-XAML expander datatrigger background color change -


reference: wpf event trigger change other ui element

i create 7 buttons(different colors) change expander header background when button clicked.

<expander x:name="dataexpander" isexpanded="{binding expander_isexpanded}"background="{binding expander_background,fallbackvalue=plum}"> <expander.header> <textblock fontsize="18" fontfamily="bold" horizontalalignment="stretch" verticalalignment="stretch"    text="{binding expander_header_text,fallbackvalue=nocolor}"/> </expander.header> <expander.style>     <style targettype="expander">         <style.triggers>             <datatrigger binding="{binding ismouseover,elementname=color0}" value="true">                 <datatrigger.enteractions>                     <beginstoryboard>                         <storyboard>                             <coloranimation  storyboard.targetproperty="expander.background" to="red" duration="0:0:0.3" begintime="0:0:1" />                         </storyboard>                     </beginstoryboard>                 </datatrigger.enteractions>             </datatrigger>             <datatrigger binding="{binding ismouseover,elementname=color1}" value="true">                 <datatrigger.enteractions>                     <beginstoryboard>                         <storyboard>                             <coloranimation  storyboard.targetproperty="expander.background" to="yellow" duration="0:0:0.3" begintime="0:0:1" />                         </storyboard>                     </beginstoryboard>                 </datatrigger.enteractions>             </datatrigger>             ...         </style.triggers>     </style> </expander.style> 

<border margin="2,2,2,2" borderbrush="gray" cornerradius="1,1,1,1" borderthickness="1,1,1,1">     <button name="color0" width="29" background="red"/> </border> <border margin="2,2,2,2" borderbrush="gray" cornerradius="1,1,1,1" borderthickness="1,1,1,1">     <button name="color1" width="29" background="yellow"/> </border>

it throw "system.invalidoperationexception:'system.windows.media.animation.coloranimation' object cannot used background property

i tried :

 <coloranimation  storyboard.targetproperty="expander.background" ...  <coloranimation  storyboard.targetproperty="background" ...  <coloranimation  storyboard.targetproperty="(expander).background" ...  <coloranimation  storyboard.targetproperty="(expander.background).color" ...  <coloranimation  storyboard.targetproperty="(background.color)" ...

change storyboard.targetproperty="expander.background" storyboard.targetproperty="(expander.background).color" , remove default background property of expander.

    <stackpanel>             <expander x:name="dataexpander" isexpanded="{binding expander_isexpanded}" >                 <expander.header>                     <textblock fontsize="18" fontfamily="bold" horizontalalignment="stretch" verticalalignment="stretch"    text="{binding expander_header_text,fallbackvalue=nocolor}"/>                 </expander.header>                 <expander.style>                     <style targettype="expander">                         <style.triggers>                             <datatrigger binding="{binding ismouseover,elementname=color0}" value="true">                                 <datatrigger.enteractions>                                     <beginstoryboard>                                         <storyboard>                                             <coloranimation  storyboard.targetproperty="(expander.background).color" to="red" duration="0:0:0.3" begintime="0:0:1" />                                         </storyboard>                                     </beginstoryboard>                                 </datatrigger.enteractions>                             </datatrigger>                             <datatrigger binding="{binding ismouseover,elementname=color1}" value="true">                                 <datatrigger.enteractions>                                     <beginstoryboard>                                         <storyboard>                                             <coloranimation  storyboard.targetproperty="(expander.background).color" to="yellow" duration="0:0:0.3" begintime="0:0:1" />                                         </storyboard>                                     </beginstoryboard>                                 </datatrigger.enteractions>                             </datatrigger>                          </style.triggers>                     </style>                 </expander.style>             </expander>             <border margin="2,2,2,2" borderbrush="gray" cornerradius="1,1,1,1" borderthickness="1,1,1,1">                 <button name="color0" width="29" background="red"/>             </border>             <border margin="2,2,2,2" borderbrush="gray" cornerradius="1,1,1,1" borderthickness="1,1,1,1">                 <button name="color1" width="29" background="yellow"/>             </border>         </stackpanel>

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