Call Oracle stored procedures using devart dotConnect

I'm new in Entity Framework and trying to call oracle stored procedures, but without success. So Here is my question:

How to call oracle stored procedures using devart dotConnect?

For example, I have stored procedure:

procedure get_problems(res out sys_refcurs开发者_高级运维or) is
  begin

   open res 
   for
   select id, name
   from problems;  

  end;

And from C# I'm tying to call:

 using (Entities entities = new Entities())
 {
     ObjectParameter res = new ObjectParameter("res", typeof(byte[]));
     ObjectResult<PROBLEM> problems = entities.SelectAllProblems(res);
 }

But it throws "EntityCommandExecutionException":

An error occurred while executing the command definition. See the inner exception for details.

Here is the inner exception:

ORA-06550: line 2, column 3:\nPLS-00306: wrong number or types of arguments in call to 'GET_PROBLEMS'\nORA-06550: line 2, column 3:\nPL/SQL: Statement ignored

I used

"typeof(byte[])"

as ObjectParameter type, because I saw this in Devart Entity Developer's generated code.

p.s. By the way, how will you recommend dotConnect in large projects?

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I know this was asked a while ago but it might help someone else as it took me a while to figure this out. Here's how we call a stored proc (SID_PGet) within a package (P_SID) and return a single string value using DotConnect. (This only returns a single value - I'm currently trying to find out how to return a sys_refcursor).

Here's the stored proc:

PROCEDURE SID_PGet(io_SID OUT varchar2) is
Begin
   io_SID:=GetSID; -- GetSID returns a unique varchar value
End;

And in the DbContext in C#:

public string GetNextSId()
{
    var parameter = new Devart.Data.Oracle.OracleParameter("io_SID", Devart.Data.Oracle.OracleDbType.VarChar, ParameterDirection.Output);
    this.Database.ExecuteSqlCommand("BEGIN P_SID.SID_PGet(:io_SID); END;", parameter);
    var sid = parameter.Value as string;

    return sid;
}