每当我使用entityframework添加记录时，有时会引发随机异常

Question

Hello so i have a working simple department database wherein the admin can add records( the only functionality that i have right now).

Here are my essential codes:

Context class:

public class DepartmentController : Controller
{

    public ActionResult Index()
    {

        EmployeeContext emp = new EmployeeContext();
       List<Department> aDep =  emp.Departments.ToList();

        return View(aDep);
    }

}

Employee Model class:

[Table("carl")]
public class Employee
{


    public int id { get; set; }

    [DisplayName("First Name")]
    [Required(ErrorMessage = "First name is required")]
    public string firstname { get; set; }


    [DisplayName("Last name")]
    [Required(ErrorMessage = "Last name is required")]
    public string lastname { get; set; }


    [DisplayName("Department")]
    [Range(1, 3)]
    [Required(ErrorMessage = "Dep num is required")]
    public int department { get; set; }


}

Controller class:

public class HomeController : Controller
{
    //
    // GET: /Home/
    public ActionResult Index()
    {           
        EmployeeContext emp = new EmployeeContext();
        List<Employee> adep = emp.Employees.ToList();

        return View(adep);
    }


    [HttpGet]
    public ActionResult Create()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Create(FormCollection form)      
    {
        if (ModelState.IsValid)
        {
            try
            {
                EmployeeContext emp = new EmployeeContext();
                Employee entry = new Employee()
                {
                    firstname = form["firstname"],
                    lastname = form["lastname"],
                    department = Convert.ToInt32(form["department"])

                };

                emp.Employees.Add(entry);
                emp.SaveChanges();
            }
            catch (Exception e)
            {
                Response.Write("Failed to Add, please try again");
            }
        }      

        return View();
    }
}

My views are just the default templates for create and list

My problem is that : They work as intended but sometimes, an exception will be thrown and will state that i failed to add my record(this is within my catch statement). So i am not sure if it the error is from my code/structure or from my server itself. What should i do?

edit: I was trying to trigger the error again but it wasn't showing up, i was testing my application earlier and sometimes my catch statement gets executed and i can't add any records after that. The error is entity dll error. I will update once i found it out.

Answer 1

Pass department as an integer object to the Employee data object.

int departmentID = 0;
departmentID = Convert.ToInt32(form["department"])

 Employee entry = new Employee()
                {
                    firstname = form["firstname"],
                    lastname = form["lastname"],
                    department = departmentID

                };