DropDownListFor throwing error after posting the form

DropDownListFor throwing error after posting the form

By : user2955531
Date : November 22 2020, 10:40 AM

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html.dropdownlistfor not posting back to controller in form

html.dropdownlistfor not posting back to controller in form

By : Vitaly Kononets
Date : March 29 2020, 07:55 AM
To fix this issue The first parameter of DropDownListFor is supposed to identify the property containing the selected value. You want this:
code :
@Html.DropDownListFor(model => model.ServiceFocus, new SelectList(Model.ServiceFocusList,"Key",
 "Value", Model.ServiceFocus), "Select a Service Focus")
@Html.DropDownListFor not posting back to controller

@Html.DropDownListFor not posting back to controller

By : João Pedro Tibério
Date : March 29 2020, 07:55 AM
Hope that helps You need to give the SelectList a different name that the property your binding to (say)
code :
ViewBag.ClassList = new SelectList(classes, "ClassId", "ClassName");` 
@Html.DropDownListFor(m => m.ClassId, ViewBag.ClassList as IEnumerable<SelectListItem>)
    ModelState.AddModelError("ClassId", "Select Class to Enroll in");
    return View(student);
[Required(ErrorMessage = "Select Class to Enroll in")] // add error message here
public int ClassId { get; set; }
@Html.DropDownListFor(m => m.ClassId, ViewBag.ClassList as IEnumerable<SelectListItem>, "--please select--")
public ActionResult Create(BusinessEntities.Student student)
  if (!ModelSTate.IsValid)
    ViewBag.ClassList = // repopulate select list
    return View(student);
  // Save and redirect
dropdownlistfor within a 'for' loop not posting values

dropdownlistfor within a 'for' loop not posting values

By : Diala Agomuoh
Date : March 29 2020, 07:55 AM
ASP.NET MVC - Submit Form DropDownListFor Error

ASP.NET MVC - Submit Form DropDownListFor Error

By : mohsenof
Date : March 29 2020, 07:55 AM
I wish this helpful for you As @StephenMuecke has already suggested the change, you need to populate ViewBag in POST method as well so that it will be available for your view.
code :
public ActionResult CreateCompany(Company comp)
        ViewBag.CompanyType = GenericMethods.GetGenericPicks2("CompanyType2").OrderBy(e => e.Name);
        ViewBag.CompanyIndustry = GenericMethods.GetGenericPicks2("CompanyIndustry").OrderBy(e => e.Name);
        if (ModelState.IsValid)
            Response.Write("Saving to DB");
            // code to save to database, redirect to other page
            return View(comp);
            return View(comp);
Mysterious Rails 5 API LoadError for model when posting JSON; no error when posting as form-data

Mysterious Rails 5 API LoadError for model when posting JSON; no error when posting as form-data

By : Abulkhair Dzhamanbay
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I had the same error and I just successfully figured out the cause of this issue. It's because abstract-controller tries to wrap your parameters and transform your controller class-name to model-name. By default params-wrapper for json-requests is enabled in config/initializers/wrap_parameters.rb file. But you also can disable this functionality on controller-level by defining next line in controller:
code :
wrap_parameters format: []
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