How to use a ViewBag to create a dropdownlist

Question

Controller   public ActionResult Filter         ViewBag Accounts   BusinessLayer AccountManager Instance getUserAccounts HttpContext User Identity Name       return View        View    lt td gt Account   lt  td gt   lt td gt  Html DropDownListFor  accountid   new SelectList ViewBag Accounts   AccountID    AccountName    lt  td gt    ViewBag Accounts contains Account objects which have AccountID  AccountName and other properties  I would like a DropDownList called accountid  so that on Form Post I can pass the selected AccountID  and the DropDownList to display the AccountName while having the AccountID as value   What am I doing wrong in the view code

User · Answer

hope it will work    Html DropDownList  accountid    IEnumerable lt SelectListItem gt  ViewBag Accounts  String Empty  new    class   extra-class       Here String Empty  will be the empty as a default selector

User · Answer

You cannot used the Helper  Html DropdownListFor  because the first parameter was not correct  change your helper to    Html DropDownList  accountid   new SelectList ViewBag Accounts   AccountID    AccountName       Html DropDownListFor receive in the first parameters a lambda expression in all overloads and is used to create strongly typed dropdowns   Here s the documentation  If your View it s strongly typed to some Model you may change your code using a helper to created a strongly typed dropdownlist  something like   Html DropDownListFor x   gt  x accountId  new SelectList ViewBag Accounts   AccountID    AccountName

User · Answer

Html DropDownListFor m   gt  m Departments id   SelectList ViewBag Department   Select   htmlAttributes  new    class    form-control

User · Answer

Try using  Html DropDownList instead    lt td gt Account   lt  td gt   lt td gt  Html DropDownList  accountid   new SelectList ViewBag Accounts   AccountID    AccountName    lt  td gt     Html DropDownListFor expects a lambda as its first argument  not a string for the ID as you specify   Other than that  without knowing what getUserAccounts   consists of  suffice to say it needs to return some sort of collection  IEnumerable for example  that has at least 1 object in it  If it returns null the property in the ViewBag won t have anything

User · Answer

Use Viewbag is wrong for sending list to view You should using Viewmodel in this case  like this   Send Country list and City list and Other list you need to show in View   HomeController Code    HttpGet          public ActionResult NewAgahi      New Advertising                         --------------------------------------------------------                                                                        Country Repository blCountry   new Country Repository                Ostan Repository blOstan   new Ostan Repository                City Repository blCity   new City Repository                Mahale Repository blMahale   new Mahale Repository                Agahi Repository blAgahi   new Agahi Repository                 var vm   new NewAgahi ViewModel                vm Country   blCountry Select                vm Ostan   blOstan Select                vm City   blCity Select                vm Mahale   blMahale Select                  vm Agahi   blAgahi Select                 return View vm                       ValidateAntiForgeryToken           HttpPost          public ActionResult NewAgahi Agahi agahi                         if  ModelState IsValid    true                                Agahi Repository blAgahi   new Agahi Repository                     agahi Date   DateTime Now Date                  agahi UserId   1048                  agahi GroupId   1                    if  blAgahi Add agahi     true                                          Success                     return JavaScript  alert                                                 else                                         Fail                     return JavaScript  alert                                       Viewmodel Code   using ProjectName Models DomainModels  using System  using System Collections Generic  using System Linq  using System Web   namespace ProjectName ViewModels       public class NewAgahi ViewModel                                                           public IEnumerable lt Country gt  Country   get  set             public IEnumerable lt Ostan gt  Ostan   get  set             public IEnumerable lt City gt  City   get  set             public IQueryable lt Mahale gt  Mahale   get  set             public ProjectName Models DomainModels Agahi Agahi   get  set                 View Code    model ProjectName ViewModels NewAgahi ViewModel                 Html DropDownList  CountryList   new SelectList Model Country   id    Name       Html DropDownList  CityList   new SelectList Model City   id    Name        Country Repository Code   using System  using System Collections Generic  using System Linq  using System Web  using ProjectName Models DomainModels   namespace ProjectName Models Repositories       public class Country Repository   IDisposable               private MyWebSiteDBEntities db   null            public Country Repository                         db   new DomainModels MyWebSiteDBEntities                       public Boolean Add Country entity  bool autoSave   true                        try                               db Country Add entity                   if  autoSave                      return Convert ToBoolean db SaveChanges                                                                        return  True                   else                     return false                            catch  Exception e                                string ss   e Message                    return e Message                  return false                                    public bool Update Country entity  bool autoSave   true                        try                               db Country Attach entity                   db Entry entity  State   System Data Entity EntityState Modified                  if  autoSave                      return Convert ToBoolean db SaveChanges                     else                     return false                            catch  Exception e                                string ss   e Message                                                                        return false                                   public bool Delete Country entity  bool autoSave   true                        try                               db Entry entity  State   System Data Entity EntityState Deleted                  if  autoSave                      return Convert ToBoolean db SaveChanges                     else                     return false                            catch                               return false                                   public bool Delete int id  bool autoSave   true                        try                               var entity   db Country Find id                   db Entry entity  State   System Data Entity EntityState Deleted                  if  autoSave                      return Convert ToBoolean db SaveChanges                     else                     return false                            catch                               return false                                   public Country Find int id                        try                               return db Country Find id                             catch                               return null                                    public IQueryable lt Country gt  Where System Linq Expressions Expression lt Func lt Country  bool gt  gt  predicate                        try                               return db Country Where predicate                             catch                               return null                                   public IQueryable lt Country gt  Select                         try                               return db Country AsQueryable                              catch                               return null                                   public IQueryable lt TResult gt  Select lt TResult gt  System Linq Expressions Expression lt Func lt Country  TResult gt  gt  selector                        try                               return db Country Select selector                             catch                               return null                                   public int GetLastIdentity                         try                               if  db Country Any                        return db Country OrderByDescending p   gt  p id  First   id                  else                     return 0                            catch                               return -1                                   public int Save                         try                               return db SaveChanges                              catch                               return -1                                   public void Dispose                         Dispose true               GC SuppressFinalize this                      protected virtual void Dispose bool disposing                        if  disposing                                if  this db    null                                        this db Dispose                        this db   null                                                      Country Repository                         Dispose false

User · Answer

Try    In the controller    ViewBag Accounts  new SelectList db Accounts   AccountId    AccountName      In the View    Html DropDownList  AccountId    IEnumerable lt SelectListItem gt  ViewBag Accounts  null  new    class   form-control       or you can replace the  null  with whatever you want display as default selector  i e   Select Account

User · Answer

I do the following  In my action method      Dictionary lt string  string gt  dictAccounts   ViewModelDropDown GetAccounts id       ViewBag accounts   dictAccounts    In my View Code   Dictionary lt string  string gt  accounts    Dictionary lt string  string gt  ViewBag accounts    Html DropDownListFor model   gt  model AccountId  new SelectList accounts   Value    Key    new   style    width 310px  height  30px  padding 5px  margin  5px 0 6px  background  none repeat scroll 0 0  FFFFFF  vertical-align middle

[asp.net-mvc] How to use a ViewBag to create a dropdownlist?

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