C# Dictionary change notification (INotifyCollectionChanged) -

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i have loop running retrieving live share prices. want check if of prices retrieved different price have stored in dictionary , notify me details of have changed. looking along lines of dictionary utilising inotifycollectionchanged.

e.g.

using system; using system.collections.generic; using system.collections.specialized; using system.linq;  namespace basicexamples {     class collectionnotify:inotifycollectionchanged     {         public dictionary<string, string> notifydictionary{ get; set; }               public collectionnotify()         {             notifydictionary = new dictionary<string, string>();         }          public event notifycollectionchangedeventhandler collectionchanged;          protected virtual void oncollectionchanged(notifycollectionchangedeventargs e)         {             if (collectionchanged != null)             {                 collectionchanged(this, e);             }         }          public void add(object k, object v)         {             notifydictionary.add(k.tostring(),v.tostring());             oncollectionchanged(new     notifycollectionchangedeventargs(notifycollectionchangedaction.add,0));         }          public void update(object k, object v)         {             bool isupdated = false;             ilist<string> changeditems = new list<string>();             int index;             if (notifydictionary.containskey(k.tostring()))             {                 notifydictionary[k.tostring()] = v.tostring();                 changeditems.add(k+":"+v);                 isupdated = true;             }             else             {                 add(k, v);             }             if (isupdated)             {                 oncollectionchanged(new notifycollectionchangedeventargs(notifycollectionchangedaction.replace,changeditems,changeditems));             }                         }     } }

with main program calling add/update test. when looping through notifycollectionchangedeventargs have nest loop , cast ienumerable - seems long winded way round.

using system; using system.collections; using system.collections.generic; using system.collections.specialized; using system.linq; using system.text; using system.threading.tasks;  namespace basicexamples {     class program     {         //delegate          static void main(string[] args)         {             //notify collection             collectionnotify notify = new collectionnotify();             notify.collectionchanged += collectionhaschanged;              notify.add("test1", "test2");             notify.add("test2","test2");             notify.add("test3", "test3");             notify.update("test2", "test1");             notify.update("test2", "test3");             notify.update("test3", "test1");             notify.update("test1", "test3");              #region lamba              //lamba             list<int> mylist = new list<int>() {1,1,2,3,4,5,6};              list<int> newlist = mylist.findall(s =>             {                 if (s == 1)                 {                     return true;                 }                 return false;             });              foreach (int b in newlist)             {                 console.writeline(b.tostring());             }              #endregion         }          public static void collectionhaschanged(object sender, eventargs e)         {             notifycollectionchangedeventargs args = (notifycollectionchangedeventargs) e;             if (args.action == notifycollectionchangedaction.replace)             {                 foreach (var item in args.newitems)                 {                     foreach (var nextitem in (ienumerable)item)                     {                         console.writeline(nextitem);                     }                 }             }         }     } }

i suppose question 2 fold:- a: best way use notifiable dictionary? b: should use nested loop above retrieve updated values?

thanks in advance


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