Question

我正在使用实体框架6和代码优先方法。我有3个模型类用户，国家和城市。我正在尝试将用户添加到数据库但无法执行此操作。这是我的用户类。

 public class User
    {
        public int userId { get; set; }
        public int cityId { get; set; }
        public String firstName { get; set; }
        public String lastName { get; set; }
        public String gender { get; set; }
        public String email { get; set; }
        public String password { get; set; }
        public String photo { get; set; }
        public DateTime joinDate { get; set; }

        //public City city { get; set; }
        //public Country country { get; set; }
        public virtual City city { get; set; }
        private String FullName
        {
            get { return firstName + lastName; }
        }

    }

控制器方法

    [HttpPost]
    public ActionResult Register(User user)
    {

        User reg = new User() { 
            cityId = 2,
            firstName = "U",
            lastName = "v",
            email = "u33@gmail.com",
            password = "123",
            gender = "Male",
            photo = "asd",
        };

        try
        {
            db.Users.Add(reg);
            db.SaveChanges();
            // TODO: Add insert logic here

            return View("Index","Home");
        }
        catch
        {
            return RedirectToAction("Index", "Home");
           // return View("Register", user);
        }
       // return View("Register", user);
    }

它转到catch语句，不会添加到数据库中。

Catch Error

Exception:Thrown: "An error occurred while updating the entries. See the inner exception for details." (System.Data.Entity.Core.UpdateException)
A System.Data.Entity.Core.UpdateException was thrown: "An error occurred while updating the entries. See the inner exception for details."
Time: 10/21/2015 5:25:41 PM
Thread:Worker Thread[5576]

Answer 1

由于DateTime是值类型，因此您需要使用Nullable<DateTime>（或DateTime?），因为DateTime.MinValue（默认值为{1}} a DateTime）不在许多Sql DB DateTime字段的可接受值范围内。

修复：

public class User
{
    public int userId { get; set; }
    public int cityId { get; set; }
    public String firstName { get; set; }
    public String lastName { get; set; }
    public String gender { get; set; }
    public String email { get; set; }
    public String password { get; set; }
    public String photo { get; set; }
    public DateTime? joinDate { get; set; }

    //public City city { get; set; }
    //public Country country { get; set; }
    public virtual City city { get; set; }
    private String FullName
    {
        get { return firstName + lastName; }
    }
}

第二个解决方案是在您创建joinDate

时为Person分配值

无法将数据添加到数据库MVC 5代码中的第一种方法

1 个答案: