c# mvc 5 error while adding a controller

Question

In my mvc project I want to add a controller with views, using Entity Framework. I'm doing it with this tutorial http://www.asp.net/mvc/overview/getting-started/introduction/accessing-your-models-data-from-a-controller

Altough I keep getting this frustrating error

I rebuilded my project many, many times. I tried some solutions I found in the Internet like Adding A New MVC 5 Controller with Views Using Entity Framework Scaffolding Error or reinstalling my nuget package, restarting Visual Studio, checking my conecctiong string (which seems alright btw), adding new model, etc. I have no idea what to do next, that's why I'm asking You for help.

I use:

Visual Studio 2013 on Windows 7
.NET Framework 4.6.2

My model code:

 public class UserResModel
   {
       [Display(Name = "ReservationID")]
       public int ReservationID { get; set; }

    [Display(Name = "Class")]
    public string ClassName { get; set; }

    [Display(Name = "When")]
    [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)]
    public DateTime ClassWhen { get; set; }

    [Display(Name = "Cancel reservation")]
    public bool CancelRes { get; set; }

}

Does your model have a default constructor? Could you show the model code? — mbrdev
– mbrdev, Commented Sep 25, 2016 at 23:44
What do you mean by that? I'm editing my question with the code — Lea
– Lea, Commented Sep 25, 2016 at 23:48
Unfortunately id didn't help :( I'm stil getting the same error — Lea
– Lea, Commented Sep 26, 2016 at 7:18

mbrdev · Accepted Answer · 2016-09-26 02:05:01Z

0

You need to add the 'Key' attribute to your ReservationID property. Scaffolding requires a Key to work when it auto generates the controller code.

[Key]
[Display(Name = "ReservationID")]
public int ReservationID { get; set; }

Once you add that, rebuild the project and try the scaffolding again.

answered Sep 26, 2016 at 2:05

mbrdev

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2 Comments

Lea Over a year ago

Unfortunately id didn't help :( I'm stil getting the same error

mbrdev Over a year ago

If you are using the scaffold controller with entity framework and views option you will need to add a DbSet<ClassRes> auto property to your DbContext class as well (In the default project this is called ApplicationDbContext) once adding that do a rebuild and try again.

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