dropdownlist set selected value in MVC3 Razor

Question

Here is my model   public class NewsCategoriesModel       public int NewsCategoriesID   get  set                public string NewsCategoriesName   get  set        My controller   public ActionResult NewsEdit int ID  dms New dsn        dsn    from a in dc dms News where a NewsID    ID select a  FirstOrDefault        var categories    from b in dc dms NewsCategories select b  ToList        var selectedValue   dsn NewsCategoriesID      SelectList ListCategories   new SelectList categories   NewsCategoriesID    NewsCategoriesName  selectedValue           ViewBag NewsCategoriesID   new SelectList categories as IEnumerable lt dms NewsCategory gt    NewsCategoriesID    NewsCategoriesName   dsn NewsCategoriesID       ViewBag NewsCategoriesID   ListCategories      return View dsn       And then my view    Html DropDownList  NewsCategoriesID    SelectList ViewBag NewsCategoriesID    When i run  the DropDownList does not select the value I set   It is always selecting the first option

User · Answer

I want to put the correct answer in here, just in case others are having this problem like I was. If you hate the ViewBag, fine don't use it, but the real problem with the code in the question is that the same name is being used for both the model property and the selectlist as was pointed out by @RickAndMSFT

Simply changing the name of the DropDownList control should resolve the issue, like so:

@Html.DropDownList("NewsCategoriesSelection", (SelectList)ViewBag.NewsCategoriesID)

It doesn't really have anything to do with using the ViewBag or not using the ViewBag as you can have a name collision with the control regardless.

User · Answer

Replace below line with new updated working code    Html DropDownList  NewsCategoriesID    SelectList ViewBag NewsCategoriesID    Now Implement new updated working code    Html DropDownListFor model   gt  model NewsCategoriesID  ViewBag NewsCategoriesID as List lt SelectListItem gt   new  name    NewsCategoriesID   id    NewsCategoriesID

User · Answer

I drilled down the formation of the drop down list instead of using  Html DropDownList    This is useful if you have to set the value of the dropdown list at runtime in razor instead of controller    lt select id  NewsCategoriesID  name  NewsCategoriesID  gt       foreach  SelectListItem option in ViewBag NewsCategoriesID                 lt option value   option Value    option Value    ViewBag ValueToSet    selected  selected         gt  option Text lt  option gt          lt  select gt

User · Answer

To have the IT department selected  when the departments are loaded from tblDepartment table  use the following overloaded constructor of SelectList class  Notice that we are passing a value of 1 for selectedValue parameter   ViewBag Departments   new SelectList db Departments   Id    Name    1

User · Answer

You should use view models and forget about ViewBag Think of it as if it didn t exist  You will see how easier things will become  So define a view model   public class MyViewModel       public int SelectedCategoryId   get  set        public IEnumerable lt SelectListItem gt  Categories   get  set         and then populate this view model from the controller   public ActionResult NewsEdit int ID  dms New dsn        var dsn    from a in dc dms News where a NewsID    ID select a  FirstOrDefault        var categories    from b in dc dms NewsCategories select b  ToList         var model   new MyViewModel               SelectedCategoryId   dsn NewsCategoriesID          Categories   categories Select x   gt  new SelectListItem                       Value   x NewsCategoriesID ToString                Text   x NewsCategoriesName                       return View model       and finally in your view use the strongly typed DropDownListFor helper    model MyViewModel   Html DropDownListFor      x   gt  x SelectedCategoryId      Model Categories

User · Answer

I prefer the lambda form of the DropDownList helper - see MVC 3 Layout Page  Razor Template  and DropdownList  If you want to use the SelectList  then I think this bug report might assist - http   aspnet codeplex com workitem 4932

User · Answer

code bellow  get from  goes  Controller   int DefaultId   1  ViewBag Person   db XXXX          ToList            Select x   gt  new SelectListItem               Value   x Id ToString                Text   x Name              Selected    x Id    DefaultId                View    Html DropDownList  Person     Note  ViewBag Person and  Html DropDownList  Person   name should be as in view model

User · Answer

Well its very simple in controller you have somthing like this   -- Controller  ViewBag Profile Id   new SelectList db Profiles   Id    Name   model Profile Id     --View  Option A    Html DropDownList  Profile Id     --View  Option B  --  Send a null value to the list   Html DropDownList  Profile Id   null   -- Choose --   new     class    input-large

User · Answer

For anyone that dont want to or dont make sense to use dropdownlistfor  here is how I did it in jQuery with  NET MVC set up    Front end Javascript -  getting data from model        var settings    Html Raw Json Encode Model GlobalSetting NotificationFrequencySettings          SelectNotificationSettings settings        function SelectNotificationSettings settings                      each settings  function  i  value                                value NotificationItemTypeId     option value     value NotificationFrequencyTypeId        prop  selected   true                                In razor html  you going to have few dropdownlist     Html DropDownList NotificationItemTypeEnum GenerateSubscriptionNotification ToString      notificationFrequencyOptions  optionLabel  DbRes T  Default    CommonLabels        htmlAttributes  New With   class    form-control notification-item-type    id   Convert ToInt32 NotificationItemTypeEnum GenerateSubscriptionNotification      And when page load  you js function is going to set the selected option based on value that s stored in  model   Cheers

User · Answer

just in case someone comes with this question  this is how I do it  please forget about the repository object  I m using the Repository Pattern  you can use your object context to retrieve the entities  And also don t pay attention to my entity names  my entity type Action has nothing to do with an MVC Action   Controller   ViewBag ActionStatusId   new SelectList repository GetAll lt ActionStatus gt      ActionStatusId    Name   myAction ActionStatusId     Pay attention that the last variable of the SelectList constructor is the selected value  object selectedValue   Then this is my view to render it    lt div class  editor-label  gt      Html LabelFor model   gt  model ActionStatusId   ActionStatus    lt  div gt   lt div class  editor-field  gt      Html DropDownList  ActionStatusId       Html ValidationMessageFor model   gt  model ActionStatusId   lt  div gt     I think it is pretty simple  I hope this helps

[asp.net-mvc-3] dropdownlist set selected value in MVC3 Razor

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