wpf - does invokecommandaction use canexecute? -

i new wpf , interactivity. trying execute command based on event trigger. in code below, when doubleclick event trigger, canexecute invoked , return false execute function still called. default behavior invokecommandaction? think when can execute returns false, execute not called.

<usercontrol x:class="..."          xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"> <i:interaction.triggers>     <i:eventtrigger eventname="mousedoubleclick">         <i:invokecommandaction command="{binding path=displayreportcommand}"/>     </i:eventtrigger> </i:interaction.triggers> ... 

yes use canexecute , command not execute if return false. have posted code example.

here command in viewmodel class

relaycommand _showmessagecommand; public icommand showmessagecommand {         {         if (_showmessagecommand == null)         {             _showmessagecommand = new relaycommand(param => this.showmessage(), param => this.canshowmessage);         }         return _showmessagecommand;     } }  public void showmessage() {     messagebox.show("nitesh"); }  private bool canshowmessage {         {         return false;    // set true execute command     }  } 

and how use in xaml

<button content="nitesh">     <i:interaction.triggers>         <i:eventtrigger eventname="mousedoubleclick">             <i:invokecommandaction command="{binding showmessagecommand}" ></i:invokecommandaction>         </i:eventtrigger>     </i:interaction.triggers> </button>