Question

I have a Database Entity Model within my ASP.Net Project

There are two foreignkeyconstructs, both are constructs between the id’s in the shown relation.

Now I’m trying to add 100 sample entries with the following method

            IntraNetEntities entities = new IntraNetEntities();

        if (entities.EmployeeList.Count() == 0)
        {
            using (entities)
            {
                for (int i = 0; i < 100; i++)
                {     

                    EmployeeList newEmployeeList = new EmployeeList()
                    {
                        department = "Standardabteilung",
                        mobile = i,
                        landline = 1 + i,
                        mail = "Standardemail",
                        position = "Standardfunktion",
                        shortcode = "abc",
                        lastname = "StandardNachname",
                        roomnumber = Convert.ToDouble(i),
                        firstname = "Standardvorname"
                    };

                    PrivateContact newPrivateContact = new PrivateContact()
                    {
                            city = "Standardstadt",
                            country = "deutscheland",
                            landline = i,
                            mail = "standardemail",
                            mobile = i * 2,
                            street = "standardstreet",
                            zip = i * 10,
                            EmployeeList = newEmployeeList
                    };

                    WorkContact newWorkContact = new WorkContact()
                    {
                        city = "Standardstadt",
                        country = "deutscheland",
                        landline = i * 9,
                        mobile = i * 12 / 8,
                        mail = "standardmail",
                        street = "standardstraße",
                        zip = i * 9,
                        EmployeeList = newEmployeeList
                    };

                    newEmployeeList.PrivateContact = newPrivateContact;
                    newEmployeeList.WorkContact = newWorkContact;

                    entities.AddToEmployeeList(newEmployeeList);
                    entities.AddToPrivateContact(newPrivateContact);
                    entities.AddToWorkContact(newWorkContact);

                }

                entities.saveChanges();

                return true;
            }
        }
        else
        {
            return false;
        }

My problem is, that my Navigation Properties disappear when this method ends!
They all look fine in debugging while still being in the using case but afterwards they are all null without me doing any changes to those values.

How can I keep the navigation values?

Thanks

Answer 1

Using calls “Dispose” at the end of it. That’s why your navigation properties drop off. From the MSDN website:

The using statement calls the Dispose method on the object in the correct way, and (when you use it as shown earlier) it also causes the object itself to go out of scope as soon as Dispose is called.

http://msdn.microsoft.com/en-us/library/yh598w02.aspx

The using statement allows the programmer to specify when objects that use resources should release them.

http://msdn.microsoft.com/en-us/library/yh598w02%28v=vs.80%29.aspx