c# - Reference c++ unmanaged libraries in WCF service -

i have strange problem referencing c++ (unmanaged) libraries in wcf service.

here there code

using system; using system.collections.generic; using system.data; using system.linq; using system.text;  using varspace.elaboration.operations.managedwrapper; //unmanaged c++ namespace using customilexception;  namespace ilcommonlibrary.core { /// <summary> /// singleton class obtain unique-per thread instance of wpc core client. /// </summary> public class wpccoreclient {     private static readonly object objlock = new object();     private readonly client managedwrapperclient= null; //class coming c++     private static volatile wpccoreclient theinstance;      private wpccoreclient()      {         managedwrapperclient=  new varspace.elaboration.operations.managedwrapper.client();     }      /// <summary>     /// <exception cref="customilexception.coreexception">core internal error.</exception>     /// </summary>     /// <returns></returns>     public static wpccoreclient createinstance()      {          if (theinstance == null) {              try {                  lock (objlock)                   {                     theinstance = new wpccoreclient(); // here have error**                  }              } catch (varspace.localization.managedwrapper.coreexception ex) {                  // error in configuratorview usage                   throw errormanagement.setexception(new customilexception.coreexception(ex.message),                             errorcodes.err_core_client_error,                             "wpccoreclient.createinstance",                             string.format("configuratorclient creation error.")                             );              }          }           return theinstance;     }      /// <summary>     /// make elaboration request wpc core system.     /// manages request has related output data.     /// </summary>     /// <param name="requestxml">xml elaboration input description</param>     /// <param name="timeout">request timeout in milliseconds.</param>     /// <param name="error">output parameter obtain string description of error.</param>     /// <returns>a boolean indicate if execution has been correcly executed or not.</returns>     ///      public bool sendrequesttowpc(string requestxml, int timeout, ref string error)     {         bool success;         int idrequest= 0; /* wpc core id of request elaboration */          error = string.empty;         datatable transactionmessages;         using (transactionmessages = new datatable())         {             try             {                 success = this.managedwrapperclient.executerequest(requestxml, timeout, ref idrequest, transactionmessages);                 if (!success)                 {                     if (transactionmessages.rows.count > 0)                     {                         error = "error code: " + transactionmessages.rows[0].field<int>("ncode") +                                 "error severity: " + transactionmessages.rows[0].field<int>("nseverity") +                                 "message: " + transactionmessages.rows[0].field<string>("nvcmsgtext");                     }                     else                     {                         error = schedulerrequesterror.geterrormessage(idrequest);                     }                 }             }             catch (exception e)             {                 error = e.message;                 return false;             }         }          return success;     } // method end  } // class end } // namespace end  

the error following:

 {"the type initializer '' threw exception."}  {"a nested exception occurred after primary exception caused c++ module fail load.\n"}     @ system.runtime.interopservices.marshal.throwexceptionforhrinternal(int32 errorcode, intptr errorinfo)    @ .docallbackindefaultdomain(intptr function, void* cookie)    @ .defaultdomain.initialize()    @ .languagesupport.initializedefaultappdomain(languagesupport* )    @ .languagesupport._initialize(languagesupport* )    @ .languagesupport.initialize(languagesupport* ) 

the strange thing if call function console application, works!!!

it's related wcf service, don't know verify, made lot of attempts.

can me?

thank you!