Extensions with Type Parameters

i have missing something, please help.

1    using system.collections.objectmodel;  2    using system.linq;  3    using system.collections;  4    using system.collections.generic;  5    using system;  6      7    namespace dashboard.helpers  8    {  9        public static class observablecollectionextentions  10       {  11     12           public static observablecollection<t> toobservablecollection(this ienumerable<t> collection)  13           {  14               //construct  15               observablecollection<t> returnvalue = new observablecollection<t>();  16     17               //populate  18               foreach (var item in collection)  19               {  20                   //returnvalue.add(item);  21               }  22     23               //return  24               return returnvalue;  25           }  26     27       }  28   }  

 error:  the type or namespace name 't' not found (are missing using directive or assembly reference?) 
 

 

hi,

a generic method method declared type parameters, instead of:

public static observablecollection<t> toobservablecollection(this ienumerable<t> collection)

 you need to add <t> after method name, this:

 public static observablecollection<t> toobservablecollection<t>(this ienumerable<t> collection)  

 

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