c# - KeyNotFoundException info -

i have c# silverlight application randomly throwing "keynotfoundexception". have no idea key cannot found. has lead me 2 questions:

1. does keynotfoundexception store/expose key tried find? when looked in documentation, did not see implied information available.
2. i catching/logging exception in general application.unhandledexception event handler. question is, if catch event here, can convert exceptionobject keynotfoundexception , still key information if exposed asked in #1?

thank help!

a keynotfoundexception caused trying value out of dictionary given key when key not present. example:

var dictionary = new dictionary<string, string>(); var val = dictionary["mykey"]; 

you can @ of places dictionary being used , determine yourself. general best practice if looking value in dictionary might not present use trygetvalue. catching exception every time more expensive operation , unnecessary:

string val; if(dictionary.trygetvalue("mykey", out val)) {      //the key found. value in val. } else {     //the key not present. } 

you can @ stacktrace property of keynotfoundexception determine problem happening. exceptions have stacktrace property, don't need care type of exception in global error handler. example:

private void application_unhandledexception(object sender,          applicationunhandledexceptioneventargs e)     {          var stacktrace = e.exceptionobject.stacktrace;          //log stacktrace somewhere.     } 

or, if want able tell type of exception is:

private void application_unhandledexception(object sender,          applicationunhandledexceptioneventargs e)     {          if (e.exceptionobject keynotfoundexception)          {              //this keynotfoundexception          }     }