System.InvalidOperationException: 'There is no ViewData item of type '

Hi Team

I am trying to fix this errror and was not successfull, can anyone mate help me on this error.

public ActionResult CourseList()
{
var list = new List<string>() { "Private(Copyrighted)", "Public Domain", "Creative Commons Licences", "CC Attribution", "CC Attribution Share ALike", "CC Attribution Non-Commercial",
"CC Attribution Non-Commercial Share Alike", "CC Attribution Non Directive", "CC Attribution Non-Commercial No Directives" };
List select_list = new List();
var query = from li in list
select new SelectListItem()
{
Value = li.ToString(),
Text = li.ToString(),
};
select_list = query.ToList();
ViewBag.list = select_list;
return View();
}
@using (Html.BeginForm("CourseList", "Home", FormMethod.Post))
{
class="form-group row">
for="Content-Licence" class="col-sm-3 col-form-label">Content Licence
class="col-sm-5">
@Html.DropDownListFor(m => Model.Dashboard.CourseLicence, ViewBag.list as List) // This throws an error here: no ViewData item of type.

}

public class RegCoursesViewModel

{

public eNtsaCourses Courses { get; set; }

public eNtsaDashboardViewModel Dashboard { get; set; }

public List lsteNtsaDashboard { get; set; }

public RegCoursesViewModel MainModel { get; set; }

}

Khatoon Hi

Its funny because no matter how much property i try to access it still see it as null. ViewBag.couse on my add watch null. Let me share the new revised code below including multiple model i am using to my View.

[HttpPost]
public ActionResult CourseList()
{
var course = new List<string>()
{ "Private(Copyrighted)","Public Domain", "Creative Commons Licences", "CC Attribution", "CC Attribution Share ALike", "CC Attribution Non-Commercial",
"CC Attribution Non-Commercial Share Alike", "CC Attribution Non Directive", "CC Attribution Non-Commercial No Directives"
};
// List of items here.
List select_list = new List();
var query = from li in course
select
new SelectListItem
{
Value = li.ToString(),
Text = li.ToString(),
};
select_list = query.ToList();
ViewBag.course = select_list;
eNtsaCourseList eCourse = new eNtsaCourseList();
return View(eCourse);
}
/ Multiple Model
public class RegCoursesViewModel
{
public eNtsaCourses Courses { get; set; }
public eNtsaCourseList eCourses { get; set; }
public eNtsaDashboardViewModel Dashboard { get; set; }
public List lsteNtsaDashboard { get; set; }
public RegCoursesViewModel MainModel { get; set; }
}
public class eNtsaCourseList
{
public string CourseLicence { get; set; }
public string Text { get; set; }
public string Value { get; set; }
public string CourseList { get; set; }
}
class="form-group row">
for="Content-Licence" class="col-sm-3 col-form-label">Content Licence
class="col-sm-5">
@Html.DropDownListFor(m=>m.eCourses.CourseLicence, ViewBag.course as List)

Your code is absolutely fine. perhaps you are not passing model object in view. with constant string it is working also by passing model object to view it is working.

@using (Html.BeginForm("CourseList", "Home", FormMethod.Post))
{
class="form-group row">
for="Content-Licence" class="col-sm-3 col-form-label">Content Licence
class="col-sm-5">
@Html.DropDownList("abc", ViewBag.list as List) // This throws an error here: no ViewData item of type.
}
@using (Html.BeginForm("CourseList", "Home", FormMethod.Post))
{
class="form-group row">
for="Content-Licence" class="col-sm-3 col-form-label">Content Licence
class="col-sm-5">
@Html.DropDownListFor(m=>m.name, ViewBag.list as List)
}

2 Replies

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Guest User6y ago
Khatoon Hi
Its funny because no matter how much property i try to access it still see it as null. ViewBag.couse on my add watch null. Let me share the new revised code below including multiple model i am using to my View.
  [HttpPost]
      public ActionResult CourseList()
       {
           var course = new List<string>()
           {  "Private(Copyrighted)","Public Domain", "Creative Commons Licences", "CC Attribution", "CC Attribution Share ALike", "CC Attribution Non-Commercial",
             "CC Attribution Non-Commercial Share Alike", "CC Attribution Non Directive", "CC Attribution Non-Commercial No Directives"
           };
           // List of items here.
           List select_list = new List();

           var query = from li in course
                       select
                       new SelectListItem
                       {
                           Value = li.ToString(),
                           Text = li.ToString(),
                       };
           select_list = query.ToList();
           ViewBag.course = select_list;
           eNtsaCourseList eCourse = new eNtsaCourseList();

           return View(eCourse);

       }
/ Multiple Model
public class RegCoursesViewModel
   {
       public eNtsaCourses Courses { get; set; }
       public eNtsaCourseList eCourses { get; set; }
       public eNtsaDashboardViewModel Dashboard { get; set; }
       public List lsteNtsaDashboard { get; set; }
       public RegCoursesViewModel MainModel { get; set; }

   }
public class eNtsaCourseList
   {
       public string CourseLicence { get; set; }
       public string Text { get; set; }

       public string Value { get; set; }
       public string CourseList { get; set; }
   }
class="form-group row">
                                           for="Content-Licence" class="col-sm-3 col-form-label">Content Licence
                                           class="col-sm-5">
                                               @Html.DropDownListFor(m=>m.eCourses.CourseLicence, ViewBag.course as List)

Sachin Singh6y ago
Your code is absolutely fine. perhaps you are not passing model object in view. with constant string it is working also by passing model object to view it is working.
    @using (Html.BeginForm("CourseList", "Home", FormMethod.Post))
    {
        class="form-group row">
            for="Content-Licence" class="col-sm-3 col-form-label">Content Licence
            class="col-sm-5">
                @Html.DropDownList("abc", ViewBag.list as List)   // This throws an error here: no ViewData item of type.
     }

          @using (Html.BeginForm("CourseList", "Home", FormMethod.Post))
{
    class="form-group row">
        for="Content-Licence" class="col-sm-3 col-form-label">Content Licence
        class="col-sm-5">
            @Html.DropDownListFor(m=>m.name, ViewBag.list as List)


  }

public class TestController : Controller
{
//
// GET: /Test/
public ActionResult Index()
{
var list = new List() { "Private(Copyrighted)", "Public Domain", "Creative Commons Licences", "CC Attribution", "CC Attribution Share ALike", "CC Attribution Non-Commercial",
"CC Attribution Non-Commercial Share Alike", "CC Attribution Non Directive", "CC Attribution Non-Commercial No Directives" };
List select_list = new List();
var query = from li in list
select new SelectListItem()
{
Value = li.ToString(),
Text = li.ToString(),
};
select_list = query.ToList();
ViewBag.list = select_list;
justtt j = new justtt();
return View(j);
}
public class justtt
    {
        public string name { get; set; }
    }