c# - AppCommand are not supported in a Windows Presentation Foundation (WPF) project -


i trying run code question "understanding icommand implementation without mvvm" in vs2012 (window 7) getting errors: "appcommand not supported in windows presentation foundation (wpf) project"

enter image description here

well, wrong or should in order run code question?

mainwindow.xaml.cs:

using system; using system.collections.generic; using system.linq; using system.text; using system.windows; using system.windows.controls; using system.windows.data; using system.windows.documents; using system.windows.input; using system.windows.media; using system.windows.media.imaging; using system.windows.navigation; using system.windows.shapes;  namespace sewpfunderstandingicommandwithout_mvvm {     public partial class mainwindow : window     {         public mainwindow()         {             initializecomponent();             appcommands.anycommand.canexecutechanged += myeventhandler;         }         private void button1_click(object sender, routedeventargs e)         {             // nothing moment         }         private void myeventhandler(object sender, eventargs e)         {             console.writeline("myeventhandler called");         }      }      public static class appcommands      {          private static icommand anycommand = new mycommand();           public static icommand anycommand          {              { return anycommand; }          }      }      public class mycommand : icommand      {          bool canexecute;           public void execute(object parameter)          {             console.writeline("execute called!");          }          public bool canexecute(object parameter)          {              console.writeline("canexecute called!");              return canexecuteresult;          }          public event eventhandler canexecutechanged;           public bool canexecuteresult          {              { return canexecute; }              set              {                  if (canexecute != value)                  {                      canexecute = value;                      var canexecutechanged = canexecutechanged;                      if (canexecutechanged != null)                          canexecutechanged.invoke(this, eventargs.empty);                  }              }          }      } }

if appcommands class defined in namespace.to.appcommads namespace, need declare in xaml:

xmlns:local="clr-namespace:namespace.to.appcommads"

and use so:

command="{x:static local:appcommands.appcommand}"

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