c# - Extension methods not showing even on implementing IEnumerable -

this code:

    class myclass : ienumerable     {         public dictionary<int, string> dctidname = new dictionary<int, string>();          public myclass()         {             (int idx = 0; idx < 100; idx++)             {                 dctidname.add(idx, string.format("item{0}", idx));             }          }          // ienumerable member         public ienumerator getenumerator()         {             foreach (object o in dctidname)             {                 yield return o;             }         }     } 

where create object of class , use in manner not linq extension methods where, count, etc.

myclass obj = new myclass(); var d = obj.where( x => x.key == 10); //<-- error here 

the namespaces have included are:

using system; using system.collections; using system.collections.generic; using system.componentmodel; using system.data; using system.diagnostics; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms; using system.xml.linq; 

how fix this?

it does work. asparallel extension method on ienumerable. extension methods though work on ienumerable<t>. class should start this:

class myclass : ienumerable<sometype> 

or:

class myclass<t> : ienumerable<t> 

(where t type of generic type argument)

---

class myclass : ienumerable<keyvaluepair<int, string>> {     public dictionary<int, string> dctidname = new dictionary<int, string>();      public myclass()     {         (int idx = 0; idx < 100; idx++)         {             dctidname.add(idx, string.format("item{0}", idx));         }      }      // ienumerable member     public ienumerator<keyvaluepair<int, string>> getenumerator()     {         foreach (keyvaluepair<int, string> o in dctidname)         {             yield return o;         }     }      ienumerator ienumerable.getenumerator()     {         return this.getenumerator();     } } 

now can call select example.