The ViewData item that has the key 'GenderID' is of type 'System.Int32' but must be of type 'IEnumerable'

Question

The error occurs when i tried to Submit/Post the data... could someone please help i tried every post but they are not helping me. I am new to mvc... any help will be granted he

Answer 1

It could be a problem between the "Gender":

[Display(Name="Gender")]
public int GenderID { get; set; }

public IEnumerable<SelectListItem> Gender { get; set; }

If I remember well, MVC attempts to map the fields automatically. Try renaming the (Name="Gender") in (Name="GenderID") or IEnumerable<SelectListItem> Gender in IEnumerable<SelectListItem> GenderEnumeration

Answer 2

The error means that the value of Model.Gender is null (and as a result the DropDownListFor() method expects that the first parameter is IEnumerable<SelectListItem>.

In your case, when you submit the form and ModelState is invalid, you return the view and have not assigned a value to Model.Gender (hence it is null and the excption is thrown.

Ensure that you re-assign the value of Model.Gender in the POST method (just as you did in the GET method) before you return the view.