vb.net - How to return two objects (including one list) in JSON with WCF -

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i trying resolve issue.

this service contract (iservice1.vb)

<operationcontract()> _ <webinvoke(method:="get", bodystyle:=webmessagebodystyle.wrapped, responseformat:=webmessageformat.json, uritemplate:="/getbooks")> _ function getbooks() list(of book)  <datacontract()> _ class book     public property bookchapter() list(of chapter)                     return m_bookchapter         end         set(value list(of chapter))             m_bookchapter = value         end set     end property     private m_bookchapter list(of chapter)      public property success() integer                     return m_success         end         set(value integer)             m_success = value         end set     end property     private m_success integer end class  <datacontract()> _ class chapter     public property description() string                     return m_description         end         set(value string)             m_description = value         end set     end property     private m_description string end class

this service (service1.vb)

public function getbooks() list(of igpservice.book) implements igpservice.getbooks     dim books new list(of igpservice.book)      dim newbook igpservice.book = new igpservice.book      integer = 0 3         dim newchapter igpservice.chapter = new igpservice.chapter         newchapter.description = "chapter1"         newbook.bookchapter.add(newchapter)     next      newbook.success = 1      books.add(newbook)      return books end function

when call getbooks, following error:

the server encountered error processing request. see server logs more details.

i don't know wrong here. couldn't find in windows eventlog.

i added new() contructor book class , works. don't know why!

class book     public property bookchapter() list(of chapter)                     return m_bookchapter         end         set(value list(of chapter))             m_bookchapter = value         end set     end property     private m_bookchapter list(of chapter)      public property success() integer                     return m_success         end         set(value integer)             m_success = value         end set     end property     private m_success integer          **public sub new()             bookchapter = new list(of chapter)         end sub** end class

i want understand why is. can explain me difference , without new()!


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