WCF exception

[dannystommen]

Following is a codesnippet from my own project, which works fine only using DataContract and DataMember attributes.

   [DataContract]
   public class User {

      [DataMember]
      public int ID {
         ...
      }

      [DataMember]
      public string Username {
         ...
      }

      [DataMember]
      public UserRole UserRole {
         ...
      }
   }

   [DataContract]
   public class UserRole {
      [DataMember]
      public int ID {
         ...
      }

      [DataMember]
      public string Description {
         ...
      }
   }

As you can see, it has the same syntax as your example. I don't use Surrogates or (Service)KnownType, and it works just fine.

The reason of the CommunicationException seems that WCF cannot serialize the class B and class C objects in class A

Can you please quote the CommuncationException (message and innerexception), instead of saying only what is causing it.