There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key ''.

Question

User982203039 posted

I am getting an error on when I submit on an edit page:
There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'Branch'.

I am confused on that is going on. Any ideas? Here my code:

Edit View:

        <div class="form-group">
            @Html.LabelFor(model => model.BRANCH, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownListFor(model =>model.BRANCH, (IEnumerable<SelectListItem>)ViewBag.Branches, null, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.BRANCH, "", new { @class = "text-danger" })
            </div>
        </div>

Controller:

public ActionResult EditDonationRequest(int id)
        {
            var Branches = bd.Branches.Select(c => new {
                BranchName = c.BranchNum + " - " + c.BranchName
            }).ToList();

            var donationrequest = dr.DonationRequests.Find(id);
            if (donationrequest == null)
            {
                return HttpNotFound();
            }
            ViewBag.Branches = new SelectList(Branches, "BranchName", "BranchName");
            return View(donationrequest);
        }

        [HttpPost]
        public ActionResult EditDonationRequest(int id, DonationRequest donationrequest)
        {
 
            try
            {
                db.Entry(donationrequest).State = System.Data.Entity.EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("DonationRequestDetails", new { id = id });
            }
            catch
            {
                return View();
            }
        }

Answer 1

User1520731567 posted

Hi Baze72,

[HttpPost]
        public ActionResult EditDonationRequest(int id, DonationRequest donationrequest)
        {
 
            try
            {
                db.Entry(donationrequest).State = System.Data.Entity.EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("DonationRequestDetails", new { id = id });
            }
            catch
            {
                return View();
            }
        }

According to your error and code,I guess you did not assign value to ViewBag.Branches in DonationRequestDetails action,

So the DonationRequestDetails View has not the ViewBag.Branches correctly set after httppost action.

I suggest you could add a line ViewBag.Branches definition in DonationRequestDetails action,for example:

public ActionResult DonationRequestDetails(int id)
{
    ...
    var Branches = bd.Branches.Select(c => new {
                BranchName = c.BranchNum + " - " + c.BranchName
            }).ToList();

     ViewBag.Branches = new SelectList(Branches, "BranchName", "BranchName");
    ...
     return View();

}

Best Regards.

Yuki Tao

Answer 2

User982203039 posted

Hi Yuji,

I tried that but still get

System.InvalidOperationException: 'There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'BRANCH'.'

I even tried to change the redirect to just go to the index page - same issue. Any other thoughts?

Answer 3

User-474980206 posted

your code is probably throwing an error. try:

        [HttpPost]
        public ActionResult EditDonationRequest(int id, DonationRequest donationrequest)
        {
 
            try
            {
                db.Entry(donationrequest).State = System.Data.Entity.EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("DonationRequestDetails", new { id = id });
            }
            catch
            {
                var Branches = bd.Branches.Select(c => new {
                    BranchName = c.BranchNum + " - " + c.BranchName
                }).ToList();
                ViewBag.Branches = new SelectList(Branches, "BranchName", "BranchName");
                return View();
            }
        }