WCF - An error occurred while receiving the HTTP response to http://xxxxx/Service/

Question

I am making this call in my WCF service:

public User GetStudentRecord(string userName)
    {
        try
        {
            return new DashboardFacade().G         


        

Answer 1

I had the same Exception but none of the answers above gave me a solution. I figured out the error by defining a trace in web.config :

I ran the website locally, fired a few failing calls and the opened the tracelog selecting the failed entry, inside that entry I saw this exception :

The entity or complex type 'Person' cannot be constructed in a LINQ to Entities query.

Constructing the person outside of the query fixed the issue so instead of :

 var persons = (from p in db.Persons
                  select new Person
                  {
                      Id = p.Id,
                      Name = p.Name,
                      LastName = p.LastName,
                      Email = p.Email
                  }
              ).AsEnumerable();

  return persons;

I had to do :

var persons = (from p in db.Persons
                  select new 
                  {
                      Id = p.Id,
                      Name = p.Name,
                      LastName = p.LastName,
                      Email = p.Email
                  }
              ).AsEnumerable()
                //construct the complex type outside of DB  (to prevent the exception that model cannot be constructed in linq to entities)
                .Select(item =>

                    new Person
                    {
                        Id = item.Id,
                        Name = item.Name,
                        LastName = item.LastName,
                        Email = item.Email
                    }).ToList(); 

            return persons;

I could have saved alot of time if the exception message was more comprehensive, judging by all the different causes outlined in this topic I guess people will agree with me.

Anyway, this is how I figured out the issue, hopefully this will help someone else to