c# - WPF/C#5.0 Publish/Subscribe to an array of static fields? -


using c# 5.0, i'm creating publish/subscribe relationship on static field, can access multiple pages. in host window, have 

public enum plcstates     {         good,         bad,         disabled     };     public static class plcsafestates     {         public static event eventhandler teststates1changed;         private static plcstates _teststates1;          public static plcstates teststates1          {         { return _teststates1; }             set             {                 if (value != _teststates1)                 {                     _teststates1 = value;                     if (teststates1changed != null)                         teststates1changed(null, eventargs.empty);                 }             }         }     }

and in pages hosted window, have things like:

public fb1() { initializecomponent(); safteyfaults.plcsafestates.teststates1changed += plcsafestates_teststates1changed;         }      private void plcsafestates_teststates1changed(object sender, eventargs e)     {     var test2 = safteyfaults.plcsafestates.teststates1;     if (test2 == safteyfaults.plcstates.bad)         {         visualstatemanager.gotostate(btnfb, "plcbad", true);          }     if (test2 == safteyfaults.plcstates.good)         {         visualstatemanager.gotostate(btnfb, "plcgood", false);         }      }      private void btnfb_click(object sender, routedeventargs e)     {         visualstatemanager.gotostate(btnout1, "plcbad",false);         if (safteyfaults.plcsafestates.teststates1 == safteyfaults.plcstates.good)         safteyfaults.plcsafestates.teststates1=safteyfaults.plcstates.bad;         else         safteyfaults.plcsafestates.teststates1 = safteyfaults.plcstates.good;      }

(right now, don't have business logic wired yet- once working, i'll link actual data).

anyhow, of works create single field can subscribe to, modify, etc. need 20+ of these fields. want make 'teststates1' array, i've not been able work.

if make following edits code shown far, compiles , runs, throws error when try access field (e.g. click on button change it):

 //window          public static class plcsafestates      {         public static event eventhandler teststates1changed;         private static plcstates[] _teststates1;          public static plcstates[] teststates1          {         { return _teststates1; }             set             {                 if (value != _teststates1)                 {                     _teststates1 = value;                     if (teststates1changed != null)                         teststates1changed(null, eventargs.empty);                 }             }         }     }  //page         public fb1()         {         initializecomponent();         safteyfaults.plcsafestates.teststates1changed += plcsafestates_teststates1changed;         }      private void plcsafestates_teststates1changed(object sender, eventargs e)     {     var test2 = safteyfaults.plcsafestates.teststates1[0];     if (test2 == safteyfaults.plcstates.bad)         {         visualstatemanager.gotostate(btnfb, "plcbad", true);          }     if (test2 == safteyfaults.plcstates.good)         {         visualstatemanager.gotostate(btnfb, "plcgood", false);         }      }      private void btnfb_click(object sender, routedeventargs e)     {         visualstatemanager.gotostate(btnout1, "plcbad",false);         if (safteyfaults.plcsafestates.teststates1[0] == safteyfaults.plcstates.good)         safteyfaults.plcsafestates.teststates1[0]=safteyfaults.plcstates.bad;         else         safteyfaults.plcsafestates.teststates1[0] = safteyfaults.plcstates.good;      }


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