c# - How to create BeginStoryboard in code behind for WPF? -

i have following xaml , wish convert code behind, have been able create animations control fades in & out expected, i'm having trouble converting ismouseover trigger code behind:

 <datatemplate.triggers>             <eventtrigger routedevent="control.loaded"                           sourcename="notificationgrid">                 <beginstoryboard x:name="beginnotificationstoryboard">                     <storyboard x:name="notificationstoryboard">                         <doubleanimation storyboard.targetname="notificationgrid"                                          from="0.01"                                          to="1"                                          storyboard.targetproperty="opacity"                                          duration="0:0:0.5" />                          <doubleanimation storyboard.targetname="notificationgrid"                                          from="1"                                          to="0"                                          storyboard.targetproperty="opacity"                                          duration="0:0:0.5"                                          begintime="0:0:5" />                     </storyboard>                 </beginstoryboard>             </eventtrigger>             <trigger property="ismouseover"                      value="true">                 <trigger.enteractions>                     <seekstoryboard offset="0:0:3"                                     beginstoryboardname="beginnotificationstoryboard" />                     <pausestoryboard beginstoryboardname="beginnotificationstoryboard" />                 </trigger.enteractions>                 <trigger.exitactions>                     <seekstoryboard offset="0:0:3"                                     beginstoryboardname="beginnotificationstoryboard" />                     <resumestoryboard beginstoryboardname="beginnotificationstoryboard" />                 </trigger.exitactions>             </trigger>         </datatemplate.triggers>     </datatemplate> 

the issue have how know 'beginstoryboardname' value should instances of seekstoryboard classes since haven't had create beginstoryboard instance animation on loading work expected.

var loadinganimation = new doubleanimation(0.01, 1, new duration(timespan.fromseconds(0.5))); var closinganimation = new doubleanimation(1, 0, new duration(timespan.fromseconds(3))) {     begintime = timespan.fromseconds(5) };  storyboard.settarget(loadinganimation, associatedobject); storyboard.settarget(closinganimation, associatedobject);  storyboard.settargetproperty(loadinganimation, new propertypath(uielement.opacityproperty)); storyboard.settargetproperty(closinganimation, new propertypath(uielement.opacityproperty));  storyboard.settarget(loadinganimation, associatedobject); storyboard.settarget(closinganimation, associatedobject);  var storyboard = new storyboard(); storyboard.children.add(loadinganimation); storyboard.children.add(closinganimation);  var enterseekstoryboard = new seekstoryboard {     offset = timespan.fromseconds(5),     // value should go here?     beginstoryboardname = "" };  var exitseekstoryboard = new seekstoryboard {     offset = timespan.fromseconds(5),     // value should go here?     beginstoryboardname = "" };  var trigger = new trigger {     property = uielement.ismouseoverproperty,     value = true };  trigger.enteractions.add(enterseekstoryboard); trigger.exitactions.add(exitseekstoryboard);  var style = new style(); style.triggers.add(trigger);  associatedobject.style = style;  storyboard.completed += handleoncompleted; storyboard.begin(); 

your full code this. i've left comments point out issues i've found:

var loadinganimation = new doubleanimation(0.01, 1, new duration(timespan.fromseconds(0.5))); var closinganimation = new doubleanimation(1, 0, new duration(timespan.fromseconds(3))) {     begintime = timespan.fromseconds(5) };  storyboard.settarget(loadinganimation, associatedobject); storyboard.settarget(closinganimation, associatedobject);  storyboard.settargetproperty(loadinganimation, new propertypath(uielement.opacityproperty)); storyboard.settargetproperty(closinganimation, new propertypath(uielement.opacityproperty));  storyboard.settarget(loadinganimation, associatedobject); storyboard.settarget(closinganimation, associatedobject);  var storyboard = new storyboard(); storyboard.children.add(loadinganimation); storyboard.children.add(closinganimation); // subscription events must done @ point, because storyboard object becomes frozen later on storyboard.completed += handleoncompleted;  string storyboardname = "beginnotificationstoryboard";  // define beginstoryboard action eventtrigger var beginstoryboard = new beginstoryboard(); beginstoryboard.name = storyboardname; beginstoryboard.storyboard = storyboard;  // create eventtrigger var eventtrigger = new eventtrigger(control.loadedevent); eventtrigger.actions.add(beginstoryboard);  // actions entering animation var enterseekstoryboard = new seekstoryboard {     offset = timespan.fromseconds(5),     beginstoryboardname = storyboardname }; var enterpausestoryboard = new pausestoryboard {     beginstoryboardname = storyboardname };  // actions exiting animation var exitseekstoryboard = new seekstoryboard {     offset = timespan.fromseconds(5),     beginstoryboardname = storyboardname }; var exitresumestoryboard = new resumestoryboard {     beginstoryboardname = storyboardname };  var trigger = new trigger {     property = uielement.ismouseoverproperty,     value = true };  trigger.enteractions.add(enterseekstoryboard); trigger.enteractions.add(enterpausestoryboard); trigger.exitactions.add(exitseekstoryboard); trigger.exitactions.add(exitresumestoryboard);  var style = new style(); // name of storyboard must registered actions can find style.registername(storyboardname, beginstoryboard); // add both eventtrigger , regular trigger style.triggers.add(eventtrigger); style.triggers.add(trigger);  associatedobject.style = style;  // no need storyboard.begin()